Beam shaping double laser light diffusion

Abstract

The invention provides a light generating system (1000) comprising a primary sub-arrangement (1110) and a light exit (1090), wherein the primary sub-arrangement (1110) comprises: (A) a first light generating device (110) configured to provide first device light (111) and comprising a solid-state light source; (B) a first diffuser arrangement (700) comprising a first diffuser (710) configured in the reflective mode and a first λ / 4 waveplate (720); wherein the diffuser arrangement (700) is configured to convert the first device light (111) received by the diffuser arrangement (700) and having a first linear polarization into first diffused device light (711) and having a second linear polarization, different from the first linear polarization; (C) a second diffuser arrangement (2700) comprising a second diffuser (2710) configured in the reflective mode and a second λ / 4 waveplate (2720), wherein the second diffuser arrangement (2700) is configured to convert the first diffused device light (711) received by the second diffuser arrangement (2700) and having one of the first linear polarization and the second linear polarization into second diffused device light (2711) having the other one of the first linear polarization and the second linear polarization; (D) one or more first optical elements (1500) comprising a first redirection optical element (510) configured in an optical path (i) between the first light generating device (111) and the first diffuser arrangement (700) and (ii) between the first diffuser arrangement (700) and the second diffuser arrangement (2700), wherein the first redirection optical element (510) is configured to transmit or reflect the first device light (111) having the first linear polarization in an optical path to the first diffuser arrangement (700) and reflect or transmit the first diffused device light (711) having the second linear polarization in an optical path to the second diffuser arrangement (2700); wherein the first optical elements (1500) are configured to reflect or transmit the first diffused device light (711) having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement (2700) and transmit or reflect the second diffused device light (2711) having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090); and (E) the light generating system (1000) is configured to provide, in an operational mode of the light generating system (1000), system light (1001) comprising at least part of the second diffused device light (2711).

Description

[0001] 2024PF80318

[0002] 1

[0003] BEAM SHAPING DOUBLE LASER LIGHT DIFFUSION

[0004] FIELD OF THE INVENTION

[0005] The invention relates to a light generating system. The invention further relates to a lighting device comprising the light generating system.

[0006] BACKGROUND OF THE INVENTION

[0007] Light generating systems are known in the art. WO2022143318A1, for instance, describes a light emitting device, comprising a first light source, a second light source, a dichroic mirror, a wavelength conversion apparatus, a first light path adjusting apparatus or a second light path adjusting apparatus, and a first scattering optical system. In the present invention, the light mixing effect of emergent light can be improved by using the first scattering optical system. The color temperature of the emergent light of the light emitting device can be freely adjusted by independently adjusting the power of the first light source and the power of the second light source.

[0008] JP7108828B2 discloses a projection display device that irradiates an image formed on a small light valve with illumination light and projects it in an enlarged manner onto a screen through a projection lens.

[0009] CN218630504U discloses a projection light source that has a laser device, a first light path guiding element, a second light path guiding element, a first dimming part and a second dimming part, wherein the first dimming part and the second dimming part are both moving parts.

[0010] CN221765854U discloses a speckle-eliminating optical path structure, comprising a laser light source for emitting a laser beam, a speckle-eliminating element for transmitting the laser beam emitted by the laser light source and a reflective optical path component that comprises a reflective surface. The laser beam emitted by the laser light source enters the speckle-eliminating element and reaches the reflective surface and is reflected by the reflective surface and enters the speckle-eliminating element.

[0011] JP2019028085 A discloses a light source device that comprises at least one blue semiconductor laser that emits blue light in a first direction and a plurality of green semiconductor lasers and red semiconductor lasers that emit green light beams and red light2024PF80318

[0012] 2

[0013] beams different from the blue light in the first direction. The number of the plurality of green semiconductor lasers and red semiconductor lasers is larger than the number of the at least one blue semiconductor laser. The green semiconductor lasers and red semiconductor lasers are provided so as to be substantially rotationally symmetric around the central axis of the blue light in a peripheral area of the at least one blue semiconductor laser.

[0014] SUMMARY OF THE INVENTION

[0015] High brightness light sources can be used in various applications including spots, stage-lighting, headlamps, home and office lighting, and automotive lighting. For applications such as stage-lighting, high brightness (white) light may be desired. However, in stage-lighting strict rules are applied regarding eye-safety. Laser-phosphor systems may allow generation of high brightness light and may therefore be used in projection systems, e.g. cinema projectors and projectors for home, school, and office applications, car front lighting, search lighting, stage lighting, architectural lighting, and special lighting applications. A downside of laser-phosphor systems is the risk of high-intensity, highly collimated, and damaging (blue) laser light being emitted from the system upon damage to and / or degradation of one or more of the phosphor and other optical components in the system. Hence, for e.g. direct lighting applications, additional safety measures may often be required, which may switch off the lighting system upon detecting e.g. a too high intensity of laser light in the system light. Yet, a downside of the safety mechanism may be that the laser-phosphor system may not provide light until e.g. a technician repairs the system, leading to consumers having to go relatively long periods without lighting. Hence, there may be a desire for a light generating system which may provide high-brightness direct laser light while being eye-safe in case of failure or degradation of a component. Hence, it is an aspect of the invention to provide an alternative light generating system, which preferably further at least partly obviates one or more of above-described drawbacks. The present invention may have as object to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.

[0016] According to a first aspect, the invention provides a light generating system comprising a primary sub-arrangement and a light exit. The primary sub-arrangement may, in embodiments, be comprised by a first lighting arrangement. In embodiments, the primary sub-arrangement may comprise a first light generating device, a first diffuser arrangement, a second diffuser arrangement, and one or more first optical elements. The first light generating device may especially comprise a solid-state light source selected from the group of laser2024PF80318

[0017] 3

[0018] diodes, superluminescent diodes, and multi -junction diodes. Especially, in embodiments, the first light generating device is configured to provide first device light. Further, in embodiments, the first diffuser arrangement may comprise a first diffuser and a first X / 4 waveplate. The first diffuser may, in embodiments, be configured in the reflective mode. Especially, in embodiments, the diffuser arrangement may be configured to convert at least part of the first device light received by the diffuser arrangement and having a first linear polarization into first diffused device light having a second linear polarization. The second linear polarization may especially be different from the first linear polarization. Further, in embodiments, the second diffuser arrangement may comprise a second diffuser and a second X / 4 waveplate. In embodiments, the second diffuser may be configured in the reflective mode. Further, in embodiments, the second diffuser arrangement may be configured to convert at least part of the first diffused device light received by the second diffuser arrangement and having one of the first linear polarization and the second linear polarization into second diffused device light, with the second diffused device light having the other one of the first linear polarization and the second linear polarization. Further, in embodiments, the one or more first optical elements may comprise at least a first redirection optical element. The first redirection optical element may especially be configured in an optical path between the first light generating device and the first diffuser arrangement. Further, in embodiments, the first redirection optical element may be configured in an optical path between the first diffuser arrangement and the second diffuser arrangement. As such, in embodiments, the first redirection optical element is configured to (i) transmit the first device light received by the first redirection optical element and having the first linear polarization in an optical path to the first diffuser arrangement and (i) reflect the first diffused device light received by the first redirection optical element and having the second linear polarization in an optical path to the second diffuser arrangement. Alternatively, in embodiments, the first redirection optical element is configured to (i) reflect the first device light received by the first redirection optical element and having the first linear polarization in an optical path to the first diffuser arrangement and (ii) transmit the first diffused device light received by the first redirection optical element and having the second linear polarization in an optical path to the second diffuser arrangement. Moreover, in embodiments, the first redirection optical element may be configured to (i) reflect the first diffused device light received from the first diffuser arrangement and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement and (ii) transmit the second diffused device light received from the second diffuser arrangement and having the other one of the2024PF80318

[0019] 4

[0020] first linear polarization and the second linear polarization in an optical path to the light exit. Alternatively, in embodiments, the first redirection optical element may be configured to (i) transmit the first diffused device light received from the first diffuser arrangement and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement and (ii) reflect the second diffused device light received from the second diffuser arrangement and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit. Thus, in embodiments, the light generating system may be configured to provide, in an operational mode of the light generating system, via the light exit, system light. Especially, in such embodiments, the system light may comprise at least part of the second diffused device light. Hence, in specific embodiments, the invention may provide a light generating system comprising a primary subarrangement and a light exit, wherein the primary sub-arrangement may comprise: (A) a first light generating device comprising a solid-state light source selected from the group of laser diodes, superluminescent diodes, and multi -junction diodes; wherein the first light generating device may be configured to provide first device light; (B) a first diffuser arrangement comprising a first diffuser and a first X / 4 waveplate, wherein the first diffuser may be configured in the reflective mode, wherein the diffuser arrangement may be configured to convert at least part of the first device light received by the diffuser arrangement and having a first linear polarization into first diffused device light having a second linear polarization, different from the first linear polarization; (C) a second diffuser arrangement comprising a second diffuser and a second X / 4 waveplate, wherein the second diffuser may be configured in the reflective mode, wherein the second diffuser arrangement may be configured to convert at least part of the first diffused device light received by the second diffuser arrangement and having one of the first linear polarization and the second linear polarization into second diffused device light, with the second diffused device light having the other one of the first linear polarization and the second linear polarization; (D) one or more first optical elements comprising at least a first redirection optical element, wherein the first redirection optical element may be configured (i) in an optical path between the first light generating device and the first diffuser arrangement and (ii) in an optical path between the first diffuser arrangement and the second diffuser arrangement, wherein the first redirection optical element may be configured to (i) transmit the first device light received by the first redirection optical element and having the first linear polarization in an optical path to the first diffuser arrangement and reflect the first diffused device light received by the first redirection optical element and having the second linear polarization in an optical path to the2024PF80318

[0021] 5

[0022] second diffuser arrangement, or (ii) reflect the first device light received by the first redirection optical element and having the first linear polarization in an optical path to the first diffuser arrangement and transmit the first diffused device light received by the first redirection optical element and having the second linear polarization in an optical path to the second diffuser arrangement; wherein the first redirection optical element may be configured to (i) reflect the first diffused device light received from the first diffuser arrangement and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement and transmit the second diffused device light received from the second diffuser arrangement and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit, or (ii) transmit the first diffused device light received from the first diffuser arrangement and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement and reflect the second diffused device light received from the second diffuser arrangement and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit; and (E) the light generating system may be configured to provide, in an operational mode of the light generating system, via the light exit, system light comprising at least part of the second diffused device light.

[0023] Such a light generating system may thus in embodiments have beam-shaping capabilities. As such, the light generating system may be configured to provide direct (laser) lighting with improved and / or controlled beam shapes, beam sizes, and beam homogenization. Moreover, the light generating system may allow direct-laser RGB architectures with high brightnesses, e.g., with a luminous flux of more than 50000 Im. Such laser lighting engines may for example be used in projectors, stage-lighting, automotive head lighting and airplane lighting. Furthermore, such a light generating system may comprise a highly eye-safe architecture, proving robust to damage or malfunction of one of the diffuser arrangements due to the double diffusion. Further, the light generating system may be relatively compact and cost-efficient, due to the use of a limited number of optical components. Hence, the invention may provide beam shaping with double laser light diffusion.

[0024] As indicated above, the invention may provide a light generating system (or “system”) comprising a primary sub-arrangement and a light exit. In embodiments, the primary sub-arrangement may comprise a first light generating device, a first diffuser arrangement, a second diffuser arrangement, and one or more first optical elements.

[0025] Especially, in embodiments, the primary sub-arrangement may be configured to generate2024PF80318

[0026] 6

[0027] primary sub-arrangement light. Here below, embodiments of the different components of the light generating system will be described in further detail.

[0028] In embodiments, the system may comprise a light exit, like an end window or an (other) optical element, like a lens, or an opening, from which the system light may escape to the external of the system. Hence, the term “light exit” may refer to a part of the system, such as in specific embodiment a part in a housing enclosing the herein described elements of the light generating system (such as optics and light generating devices), from which the system light may emanate (during an operational mode of the light generating system).

[0029] Hence, the system may comprise a housing, comprising such light exit. The housing may at least partly enclose one or more light generating devices and one or more (other) optical elements.

[0030] The system especially comprises a first light generating device. In embodiments, the primary sub-arrangement may comprise the first light generating device. The term “first light generating device” may also refer to a plurality of (essentially identical) first light generating devices, such as from the same bin. Especially, each light generating device may comprise a (solid state) light source, configured to generate light source light. Hence, especially the light of the primary sub-arrangement may in embodiments comprise, or essentially consist, of the light source light of the (solid state) light source. Here below, some embodiments of light generating devices and light sources are described in general.

[0031] A light generating device may especially be configured to generate device light. Especially, the light generating device may comprise a light source. The light source may be especially configured to generate light source light. In embodiments, the device light may essentially consist of the light source light. In other embodiments, the device light may essentially consist of converted light source light. In yet other embodiments, the device light may comprise (unconverted) light source light and converted light source light. Light source light may be converted with a luminescent material into luminescent material light and / or with an upconverter into upconverted light (see also below). The term “light generating device” may also refer to a plurality of light generating devices which may provide device light having essentially the same spectral power distributions. In (other) specific embodiments, the term “light generating device” may also refer to a plurality of light generating devices which may provide device light having different spectral power distributions.

[0032] The term “light source” may in principle relate to any light source known in the art. It may be a conventional (tungsten) light bulb, a low pressure mercury lamp, a high2024PF80318

[0033] 7

[0034] pressure mercury lamp, a fluorescent lamp, an LED (light emitting diode). In a specific embodiment, the light source comprises a solid state light source (such as an LED or laser diode (or “diode laser”)). The term “light source” may also relate to a plurality of light sources, such as 2-2000 (solid state) laser diodes.

[0035] The light source may have a light escape surface. Referring to conventional light sources such as light bulbs or fluorescent lamps, it may be an outer surface of a glass or a quartz envelope. For LED’s it may for instance be the LED die, or when a resin is applied to the LED die, the outer surface of the resin. In principle, it may also be the terminal end of a fiber. The term escape surface especially relates to that part of the light source, where the light actually leaves or escapes from the light source. The light source is configured to provide a beam of light. This beam of light (thus) escapes from the light exit surface of the light source.

[0036] Likewise, a light generating device may comprise a light escape surface, such as an end window. Further, likewise a light generating system may comprise a light escape surface, such as an end window.

[0037] The term “light source” may refer to a semiconductor light-emitting device, such as a light emitting diode (LEDs), a resonant cavity light emitting diode (RCLED), a vertical cavity laser diode (VCSELs), an edge emitting laser, etc... The term “light source” may also refer to an organic light-emitting diode (OLED), such as a passive-matrix (PMOLED) or an active-matrix (AMOLED). In a specific embodiment, the light source comprises a solid-state light source (such as an LED or laser diode). In an embodiment, the light source comprises an LED (light emitting diode). The terms “light source” or “solid state light source” may also refer to a superluminescent diode (SLED). The term LED may also refer to a plurality of LEDs. The term “light source” may also relate to a plurality of (essentially identical (or different)) light sources, such as 2-2000 solid state light sources. In embodiments, the light source may comprise one or more micro-optical elements (array of micro lenses) downstream of a single solid-state light source, such as an LED, or downstream of a plurality of solid-state light sources (i.e. e.g. shared by multiple LEDs). In embodiments, the light source may comprise an LED with on-chip optics. In embodiments, the light source comprises pixelated single LEDs (with or without optics) (offering in embodiments on-chip beam steering).

[0038] In other embodiments, however, the light source may be configured to provide primary radiation and part of the primary radiation is converted into secondary radiation. Secondary radiation may be based on conversion by a luminescent material.2024PF80318

[0039] 8

[0040] In embodiments, the light generating device may comprise a luminescent material. In embodiments, the light generating device may comprise a PC LED. In other embodiments, the light generating device may comprise a direct LED (i.e. no phosphor). In embodiments, the light generating device may comprise a laser device, like a laser diode. In embodiments, the light generating device may comprise a superluminescent diode. Hence, in specific embodiments, the light source may be selected from the group of laser diodes and superluminescent diodes. In other embodiments, the light source may comprise an LED.

[0041] The term “light source” may (thus) refer to a light generating element as such, like e.g. a solid state light source, or e.g. to a package of the light generating element, such as a solid state light source, and one or more of a luminescent material comprising element and (other) optics, like a lens, a collimator. A light converter element (“converter element” or “converter”) may comprise a luminescent material comprising element. For instance, a solid state light source as such, like a blue LED, is a light source. A combination of a solid state light source (as light generating element) and a light converter element, such as a blue LED and a light converter element, optically coupled to the solid state light source, may also be a light source (but may also be indicated as light generating device). Hence, a white LED is a light source (but may e.g. also be indicated as (white) light generating device).

[0042] The term “light source” herein may also refer to a light source comprising a solid state light source, such as an LED or a laser diode or a superluminescent diode.

[0043] The phrases “different light sources” or “a plurality of different light sources”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from at least two different bins. Likewise, the phrases “identical light sources” or “a plurality of same light sources”, and similar phrases, may in embodiments refer to a plurality of solid-state light sources selected from the same bin.

[0044] The term “solid state light source”, or “solid state material light source”, and similar terms, may especially refer to semiconductor light sources, such as a light emitting diode (LED), a laser diode, or a superluminescent diode.

[0045] In embodiments, the terms “laser” or “solid state laser” or “solid state material laser” may refer to one or more of a semiconductor laser diodes, such as GaN, InGaN, AlGalnP, AlGaAs, InGaAsP, lead salt, vertical cavity surface emitting laser (VCSEL), quantum cascade laser, hybrid silicon laser, etc.

[0046] A laser diode (or diode laser) may be a semiconductor device substantially similar to a light-emitting diode in which a diode pumped directly with electrical current can create lasing conditions at the diode's junction. This is known to a person skilled in the art. In2024PF80318

[0047] 9

[0048] embodiments, laser banks may be applied. Laser banks may also be used to boast the input power. Therefore, in embodiments the system may comprise a plurality of light generating devices configured in a laser bank. A laser bank may comprise a light emitting arrangement comprising an (2D) array of a plurality of laser diodes arranged on a thermally conductive carrier and a (lens array having a) plurality of collimator lenses corresponding to the laser diodes such that each laser diode of the plurality of laser diodes comprises a collimator lens for collimating laser light emitted by the laser diode.

[0049] In relation to the first light generating device, it is noted that especially the first light generating device may be configured to generate first device light. In specific embodiments, the first light generating device may comprise one or more of a laser diode, a superluminescent diode, and a multi -junction diode. Especially, the first light generating device may comprise a laser diode. In specific embodiments, the first light generating device may comprise a first laser bank comprising a plurality of first lasers (i.e. especially first laser diodes). The spectral power distribution of the first device light may be selected from essentially any possible option, though in general with at least some spectral power, if not all, in the visible wavelength range. Hence, in embodiments the first device light may have spectral power at one or more wavelengths selected from the range of 380-780 nm. More especially, the first device light may have a peak wavelength in the wavelength range of 380-780 nm. When white system light may be desirable in one or more operational modes of the light generating system, the spectral power distribution of the first device light may especially be chosen having a peak wavelength in the blue wavelength range, i.e., the wavelength range of 380-490 nm. Herein, in specific embodiments the first device light may have a peak wavelength in the wavelength range of 380-490 nm, more especially a peak wavelength in the wavelength range of 430-490 nm, such as a peak wavelength in the wavelength range of 440-490 nm. However, intensity at other wavelengths may also be possible, such as within the wavelength range of 620-780 nm.

[0050] In specific embodiments, the first device light may be polarized light.

[0051] Especially, in embodiments, the first device light may be linearly polarized light. However, this may not necessarily be the case. For instance, in alternative embodiments, the first device light may be elliptically polarized light. In embodiments, the first light generating device may be configured to generate polarized first device light. Additionally or alternatively, in embodiments, the light generating system may comprise a polarizer (i) configured downstream of the first light generating device and upstream of the first redirection optical2024PF80318

[0052] 10

[0053] element and (ii) configured to impose a polarization on the first device light received by the polarizer.

[0054] As indicated above, in embodiments, the primary sub-arrangement may further comprise a first diffuser arrangement and a second diffuser arrangement.

[0055] The first diffuser arrangement may especially be configured downstream of the first light generating device. The terms “upstream” and “downstream” relate to an arrangement of items or features relative to the propagation of the light from a light generating means (here the especially the light source), wherein relative to a first position within a beam of light from the light generating means, a second position in the beam of light closer to the light generating means is “upstream”, and a third position within the beam of light further away from the light generating means is “downstream”. Hence, the first diffuser arrangement may be configured in a light-receiving relationship with the first device light. As such, in embodiments, the first diffuser arrangement may be configured to convert at least part of the first device light received by the diffuser arrangement into first diffused device light. Especially, in embodiments, the first diffuser arrangement may be configured to convert at least part of the first device light received by the diffuser arrangement and having a first linear polarization into first diffused device light and having a second linear polarization, different from the first linear polarization.

[0056] Therefore, in embodiments, the first diffuser arrangement may comprise a first diffuser and a first X / 4 waveplate (or quarter waveplate). The first diffuser may especially be configured in the reflective mode. In the reflective mode, thermal management may be easier, as a substantial part of the diffuser may be in thermal contact with a thermally conductive element, like a heatsink or heat spreader. Furthermore, in the reflective mode the light generating system may be intrinsically safe, should the diffuser break or malfunction.

[0057] Alternatively, in embodiments, the first diffuser may be configured in the transmissive mode. Further, in embodiments, the first diffuser may comprise a polarization maintaining diffuser.

[0058] The first diffuser may, in embodiments, be configured to diffuse (or scatter) at least part of the first device light received by the first diffuser via the first redirection optical element. Especially, in embodiments, the first diffuser may be configured to diffuse at least 60%, such as at least 70%, especially at least 80%, more especially at least 90% of the first device light, received by the first diffuser via the first redirection optical element, into first diffused device light. Moreover, in embodiments, the first diffuser may be configured to diffuse at least 95%, such as at least 98%, especially at least 99%, including essentially 100%2024PF80318

[0059] 11

[0060] of the first device light, received by the first diffuser via the first redirection optical element, into first diffused device light.

[0061] Further, in embodiments, the first X / 4 waveplate may be configured in an optical path between the first redirection optical element and the first diffuser. Especially, in embodiments, the first X / 4 waveplate may be configured in a light-receiving relationship with the first device light (via the first redirection optical element). As known from the art, a waveplate or retarder is an optical device that may alter the polarization state of a light wave travelling through it depending on the orientation of the waveplate relative to the propagation direction and the state of polarization of the light wave. A halfwave plate may shift the polarization direction of linear polarized light (especially from s to p or from p to s polarization). Conversely, a quarter-wave plate may convert linear polarized light into elliptically (such as especially circularly) polarized light (and vice versa). Especially, herein, in embodiments, the first X / 4 waveplate may be configured to convert linear polarized first device light received by the first X / 4 waveplate into elliptical (such as especially circularly) polarized first device light. Especially, in embodiments, the first X / 4 waveplate may be configured to convert the first device light received by the first X / 4 waveplate and having a linear polarization into first device light having a first elliptical (such as circular) polarization. Moreover, in embodiments, the first X / 4 waveplate may, in embodiments, be configured to direct first device light received by the first X / 4 waveplate (from the first redirection optical element) to the first diffuser. The first device light having the first elliptical polarization may be diffused by the first diffuser into first diffused device light having a second elliptical polarization, different from the first elliptical polarization.

[0062] Additionally or alternatively, in embodiments, the first X / 4 waveplate may be configured to convert elliptical polarized first (diffused) device light (such as especially circularly polarized light) received by the first X / 4 waveplate into linear polarized first (diffused) device light. Especially, in embodiments, the first X / 4 waveplate may be configured to convert the first diffused device light received by the first X / 4 waveplate and having the second elliptical polarization into first device light having another linear polarization. Additionally, in embodiments, the first X / 4 waveplate may be configured to direct first diffused device light received by the first X / 4 waveplate from the first diffuser to the first redirection optical element. Hence, in embodiments, in an operational mode of the light generating system, the first device light, received by the first redirection optical element from the first light generating device, may have the first linear polarization and the first2024PF80318

[0063] 12

[0064] diffused device light, received by the first redirection optical element via the first X / 4 waveplate, may have the second linear polarization.

[0065] In embodiments, the first diffuser may be (diffuse) reflective for first device light. In embodiments, the first diffuser may comprise a surface diffuser, a volume diffuser, or a combination of a surface and volume diffuser. The first diffuser may, in embodiments, comprise one or more materials selected from the group comprising: a glass with high transmission in the spectral range of the first device light, a silicone-based material, and a transparent ceramic material such as e.g. sapphire. Especially, in embodiments, the first diffuser may comprise one (or more) of: a small angle scattering metallic substrate, a white ceramic reflector, a patterned glass-based substrate with a (deposited metallic or (layered) dielectric) reflective coating, a combination of optical micro-structures with specular reflective elements, a combination of a solid optical body with a diffuse reflector, a combination of a structured surface with a dichroic or thin film deposited reflector, and a combination of a total internal reflector element with additional surface structuring. The first diffuser may especially be selected based on preferred system characteristics, such as thermal management, bulkiness, and cost.

[0066] Alternatively, in embodiments, the first diffuser may comprise a transmissive diffuser. For example, the transmissive diffuser may comprise optical micro-structures configured to provide (both) transmissive and reflective diffusion of light received by the diffuser.

[0067] Further, in embodiments, the first diffuser may comprise a static diffuser. Alternatively, in embodiments, the first diffuser may comprise a dynamic diffuser, such as e.g. a rotating wheel comprising a reflective diffuser track.

[0068] Similarly, in embodiments, the second diffuser arrangement may especially be configured downstream of the first light generating device and optionally the first diffuser arrangement. In specific embodiments, the second diffuser arrangement may be configured downstream of both the first light generating device and the first diffuser arrangement.

[0069] Hence, the second diffuser arrangement may be configured in a light-receiving relationship with the first (diffused) device light. As such, in embodiments, the second diffuser arrangement may be configured to convert at least part of the first (diffused) device light received by the second diffuser arrangement into second diffused device light. Especially, in embodiments, the second diffuser arrangement may be configured to convert at least part of the first (diffused) device light received by the second diffuser arrangement and having one of the first linear polarization and the second linear polarization into second diffused device2024PF80318

[0070] 13

[0071] light, with the second diffused device light having the other one of the first linear polarization and the second linear polarization.

[0072] Therefore, in embodiments, the second diffuser arrangement may comprise a second diffuser and a second X / 4 waveplate. The second diffuser may especially be configured in the reflective mode. Alternatively, in embodiments, the second diffuser may be configured in the transmissive mode. Further, in embodiments, the second diffuser may comprise a polarization maintaining diffuser.

[0073] The second diffuser may, in embodiments, be configured to diffuse (or scatter) at least part of the first (diffused) device light received by the second diffuser. Especially, in embodiments, the second diffuser may be configured to diffuse at least 60%, such as at least 70%, especially at least 80%, more especially at least 90% of the first (diffused) device light, received by the second diffuser, into second diffused device light. Moreover, in embodiments, the second diffuser may be configured to diffuse at least 95%, such as at least 98%, especially at least 99%, including essentially 100% of the first (diffused) device light, received by the first diffuser, into second diffused device light.

[0074] Further, in embodiments, the second X / 4 waveplate may be configured in an optical path between the first redirection optical element and the second diffuser. Moreover, in some embodiments, the second X / 4 waveplate may be configured in an optical path between a second redirection optical element (see also further below) and the second diffuser. In embodiments, the one or more first optical elements may comprise the first redirection optical element and optionally a second redirection optical element. In embodiments where the one or more first optical elements comprise both the first redirection optical element and the second redirection optical element, the second redirection optical element may be configured downstream of the first redirection optical element and even downstream of the first diffuser arrangement. Hence, in embodiments, the one or more first optical elements may be configured to direct first diffused device light, received from the first diffuser arrangement, to the second X / 4 waveplate. Especially, in embodiments, the first redirection optical element may be configured to direct first diffused device light, received from the first diffuser arrangement, to the second X / 4 waveplate. Alternatively, in embodiments where the one or more first optical elements comprise both the first redirection optical element and the second redirection optical element, the second redirection optical element may be configured to direct first diffused device light, received from the first diffuser arrangement, to the second X / 4 waveplate.2024PF80318

[0075] 14

[0076] Thus, in embodiments, the second X / 4 waveplate may be configured in a lightreceiving relationship with the first device light (via the first redirection optical element and optionally one or more of the first diffuser arrangement and the second redirection optical element). Especially, herein, in embodiments, the second X / 4 waveplate may be configured to convert linear polarized first (diffused) device light received by the second X / 4 waveplate into elliptical (such as especially circularly) polarized first (diffused) device light. Especially, in embodiments, the second X / 4 waveplate may be configured to convert the first (diffused) device light received by the second X / 4 waveplate and having a linear polarization into first (diffused) device light having the second elliptical (such as circular) polarization. Moreover, in embodiments, the second X / 4 waveplate may, in embodiments, be configured to direct first (diffused) device light received by the second X / 4 waveplate from the first diffuser arrangement (via the first redirection optical element and optionally the second redirection optical element) to the second diffuser. The first (diffused) device light having the second elliptical polarization may be diffused by the second diffuser into second diffused device light having the first elliptical polarization.

[0077] Additionally or alternatively, in embodiments, the second X / 4 waveplate may be configured to convert elliptical polarized second diffused device light (such as especially circularly polarized light) received by the second X / 4 waveplate into linear polarized second diffused device light. Especially, in embodiments, the second X / 4 waveplate may be configured to convert the second diffused device light received by the second X / 4 waveplate and having the first elliptical polarization into second diffused device light having another linear polarization. Additionally, in embodiments, the second X / 4 waveplate may be configured to direct second diffused device light received by the second X / 4 waveplate from the second diffuser in an optical path to the light exit (via the first redirection optical element and optionally the second redirection optical element). Especially, in embodiments, the first diffused device light, received by the second redirection optical element from the first diffuser arrangement via the first redirection optical element, may have one of the first linear polarization and the second linear polarization and the second diffused device light, received by the second redirection optical element via the second X / 4 waveplate, may have the other one of the first linear polarization and the second linear polarization.

[0078] In embodiments, the first linear polarization and the second linear polarization may especially be different linear polarizations. For example, the first device light, received by the first redirection optical element from the first light generating device, may have a linear polarization selected from p-polarization and s-polarization and the first diffused2024PF80318

[0079] 15

[0080] device light, received by the first redirection optical element via the first X / 4 waveplate, may have another linear polarization selected from p-polarization and s-polarization. The linear polarizations s-polarized and p-polarized may be considered complementary polarizations (or orthogonal polarizations (i.e. 90° rotated)). In specific embodiments, the first linear polarization and the second linear polarization may be 90° rotated relative to each other.

[0081] In embodiments, one or more of the first diffuser and the second diffuser may each (individually) be configured on a support. In embodiments, the support may especially comprise a thermally conductive support, such as a heat sink and / or a rotating support.

[0082] As described above, the first diffuser arrangement may thus be configured in a light-receiving relationship with the first light generating device via the first redirection optical element. Hence, in embodiments, the one or more first optical elements may comprise at least the first redirection optical element. In embodiments, the first redirection optical element 510 may be configured in an optical path between the first light generating device and the first diffuser arrangement. As such, the first redirection optical element may be configured to direct the first device light received by the first redirection optical element into an optical path to the first diffuser arrangement. Especially, in embodiments, the first redirection optical element may be configured to transmit the first device light received by the first redirection optical element and having the first linear polarization in an optical path to the first diffuser arrangement. Alternatively, in embodiments, the first redirection optical element may be configured to reflect the first device light received by the first redirection optical element and having the first linear polarization in an optical path to the first diffuser arrangement.

[0083] Further, in embodiments, the first redirection optical element may be configured in an optical path between the first diffuser arrangement and the second diffuser arrangement. As such, the first redirection optical element may be configured to direct the first diffused device light received by the first redirection optical element into an optical path to the second diffuser arrangement. Especially, in embodiments, the first redirection optical element may be configured to reflect the first diffused device light received by the first redirection optical element and having the second linear polarization in an optical path to the second diffuser arrangement. Alternatively, in embodiments, the first redirection optical element may be configured to transmit the first diffused device light received by the first redirection optical element and having the second linear polarization in an optical path to the second diffuser arrangement.2024PF80318

[0084] 16

[0085] In embodiments, the one or more first optical elements may thus comprise the first redirection optical element, which may be configured in an optical path between (i) the first light generating device and the first diffuser arrangement, and (ii) the first diffuser arrangement and one or more of the second redirection optical element, the second diffuser arrangement, and the light exit. Especially, in embodiments, the first redirection optical element may be configured to reflect the first diffused device light received from the first diffuser arrangement and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement. In alternative embodiments, the first redirection optical element may be configured to transmit the first diffused device light received from the first diffuser arrangement and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement. In embodiments, the first redirection optical element may transmit or reflect the first diffused device light received from the first diffuser arrangement and having one of the first linear polarization and the second linear polarization in an optical path via the second redirection optical element to the second diffuser arrangement.

[0086] Further, in embodiments, the one or more first optical elements (such as one of the first redirection optical element and the second redirection optical element) may be configured to transmit the second diffused device light received from the second diffuser arrangement and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit. In alternative embodiments, the one or more first optical elements (such as one of the first redirection optical element and the second redirection optical element) may be configured to reflect the second diffused device light received from the second diffuser arrangement and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit.

[0087] Herein, the light generating system may especially be configured to provide, in an operational mode of the light generating system, system light. The system light may especially be provided via the light exit. Moreover, in embodiments, the system light may comprise at least part of the second diffused device light.

[0088] As described above, the one or more first optical elements may thus comprise at least the first redirection optical element. Further, in embodiments, the one or more first optical elements may comprise the second redirection optical element.

[0089] The second redirection optical element may especially be configured in an optical path between the first diffuser arrangement (such as especially between the first redirection optical element) and the second diffuser arrangement. Furthermore, the second2024PF80318

[0090] 17

[0091] redirection optical element may be configured in an optical path between the second diffuser arrangement and the light exit. As such, in embodiments, the second redirection optical element may be configured to reflect the first diffused device light received by the second redirection optical element and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement. Alternatively, in embodiments, the second redirection optical element may be configured to transmit the first diffused device light received by the second redirection optical element and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement.

[0092] Further, in embodiments, the second redirection optical element may be configured to transmit the second diffused device light received by the second redirection optical element and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit. Alternatively, in embodiments, the second redirection optical element may be configured to reflect the second diffused device light received by the second redirection optical element and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit.

[0093] In embodiments, the second redirection optical element may especially comprise a polarizing beam splitter. Similarly, in embodiments, the first redirection optical element may comprise a polarizing beam splitter. In embodiments, a polarizing beam splitter or beam combiner may be configured to split two different types of light, e.g. light having a first (linear) polarization and light having a second (linear) polarization, different from the first (linear) polarization, into different directions (, i.e., different optical paths). Further, a polarizing beam splitter or beam combiner may, in embodiments, be configured combine two different types of light, e.g. a light having a first (linear) polarization and light having a second (linear) polarization, different from the first (linear) polarization, into essentially the same direction (, i.e., the same optical path). Hence, the terms “polarizing beam splitter” or “polarizing beam combiner”, or similar terms, are herein used, to indicated that in embodiments two types or more than two types of light may be combined or separated (“split”). With a polarizing beam combiner, (i) separate beams of light having different (linear) polarization may be “multiplexed” (i.e. combined) and / or (ii) coaxial beams of light having different (linear) polarization may be split.

[0094] In embodiments, the one or more first optical elements may comprise a third redirection optical element. In embodiments, the third redirection optical element may comprise a polarizing beam splitter. In embodiments, the third redirection optical element2024PF80318

[0095] 18

[0096] may be configured in an optical path between the first redirection optical element (especially a system X / 2 waveplate, see also further below) and the light exit. Further, in some embodiments, the third redirection optical element may thus be configured in an optical path between the first redirection optical element (especially the system X / 2 waveplate) and the second redirection optical element. In embodiments, the third redirection optical element may especially be configured to transmit first diffused device light received by the third redirection optical element (from the first redirection optical element optionally via the system X / 2 waveplate) and having one of the first linear polarization and the second linear polarization in an optical path to the second redirection optical element. Alternatively, in embodiments, the third redirection optical element may especially be configured to reflect first diffused device light received by the third redirection optical element (from the first redirection optical element optionally via the system X / 2 waveplate) and having one of the first linear polarization and the second linear polarization in an optical path to the second redirection optical element.

[0097] Additionally, in embodiments, the third redirection optical element may especially be configured to reflect first diffused device light received by the third redirection optical element (from the first redirection optical element optionally via the system X / 2 waveplate) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (without propagating via the second diffuser arrangement, i.e., bypassing the second diffuser arrangement). Alternatively, in embodiments, the third redirection optical element may especially be configured to transmit first diffused device light received by the third redirection optical element (from the first redirection optical element optionally via the system X / 2 waveplate) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (without propagating via the second diffuser arrangement, i.e., bypassing the second diffuser arrangement).

[0098] In embodiments, the third redirection optical element may (instead of a polarizing beam splitter) comprise a semi-transparent mirror. Especially, in embodiments, the third redirection optical element may be configured to transmit that x% of the first diffused device light received by the third redirection optical element from the first redirection optical element, and reflect 100-x% of the first diffused device light received by the third redirection optical element from the first redirection optical element. In embodiments, x may be selected from the range of 0-100%, such as from the range of 5-95%, like from the range of 10-90%.2024PF80318

[0099] 19

[0100] Moreover, in embodiments, x may be selected from the range of 20-80%, such as from the range of 30-70%, like from the range of 40-60%.

[0101] Further, in some embodiments, the third redirection optical element and the second redirection optical element may be comprised by the same singular element. Hence, in such embodiments, the third redirection optical element is not necessarily configured in an optical path between the first redirection optical element and the second redirection optical element, as it is comprised by (and thus collocated with) the second redirection optical element. Further, in such embodiments, the (combined second redirection optical element and) third redirection optical element may be configured to transmit at least part of the first diffused device light received by the third redirection optical element (from the first redirection optical element) in an optical path to the light exit (optionally via one or more reflectors) and reflect at least another part of the first diffused device light received by the third redirection optical element (from the first redirection optical element) in an optical path to the second diffuser arrangement.

[0102] In embodiments, the third redirection optical element may thus be configured to control the propagation of the first diffused device light from the first diffuser to the light exit, such that (i) at least part of the first diffused device light may propagate via the second diffuser arrangement and / or (ii) at least part of the first diffused device light may bypass the second diffuser arrangement.

[0103] The one or more first optical elements may further, in embodiments, comprise a fourth redirection optical element. In embodiments, the fourth redirection optical element may be configured in an optical path between the third redirection optical element and the light exit. Additionally, in embodiments, fourth redirection optical element may be configured in an optical path between the second redirection optical element and the light exit. In embodiments, the fourth redirection optical element may especially be configured to transmit second diffused device light received by the fourth redirection optical element (from the second redirection optical element) and having one of the first linear polarization and the second linear polarization in an optical path to the light exit. Alternatively, in embodiments, the fourth redirection optical element may especially be configured to reflect second diffused device light received by the fourth redirection optical element (from the second redirection optical element) and having one of the first linear polarization and the second linear polarization in an optical path to the light exit. Additionally, in embodiments, the fourth redirection optical element may be configured to reflect first diffused device light received by the fourth redirection optical element (from the third redirection optical element) and having2024PF80318

[0104] 20

[0105] the other one of the first linear polarization and the second linear polarization in an optical path to the light exit. Alternatively, in embodiments, the fourth redirection optical element may be configured to transmit first diffused device light received by the fourth redirection optical element (from the third redirection optical element) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit.

[0106] As such, in embodiments, the light generating system may be configured to provide, in an operational mode of the light generating system, via the light exit, system light comprising at least part of the first diffused device light.

[0107] In embodiments, the light generating system may further comprise a polarization control system. The polarization control system may especially be configured to control rotation of the second redirection optical element relative to an optical axis (O) of incoming first diffused device light on the second redirection optical element. As such, the polarization control system may, in embodiments, be configured to control the polarization of the first (diffused) device light propagating from the second redirection optical element. Additionally or alternatively, in embodiments, the polarization control system may be configured to change a polarization direction of the first diffused device light on the second redirection optical element. For example, in embodiments, the one or more first optical elements may comprise a third redirection optical element (see also further below) configured in an optical path between the first redirection optical element and the second redirection optical element. In such embodiments, the polarization control system may especially be configured to control rotation of the third redirection optical element relative to an optical axis (O) of incoming first diffused device light on the third redirection optical element. As such, the polarization control system may, in embodiments, be configured to control the polarization of the first (diffused) device light propagating from the third redirection optical element. Further, in embodiments, the polarization control system may (also) be configured to control rotation of an assembly of (i) the first light generating device, (ii) the first redirection optical element, and (iii) the first diffuser arrangement, relative to the optical axis (O) of incoming first diffused device light on the second redirection optical element.

[0108] The polarization control system may especially be configured to provide an adjustable contribution of the first diffused device light in an optical path to (i) the light exit via the second diffuser arrangement and (ii) the light exit (without propagating via the second diffuser arrangement.

[0109] Therefore, in embodiments, the polarization control system may comprise a system X / 2 waveplate. The system X / 2 waveplate may especially be configured in an optical2024PF80318

[0110] 21

[0111] path between the first redirection optical element and the second redirection optical element. In embodiments, the system X / 2 waveplate may be configured to convert (first) linear polarized light into elliptical polarized light or into (second) linear polarized light having a different (relative to the first linear polarization) polarization direction. For example, the system X / 2 waveplate may be configured to convert first diffused device light received by the system X / 2 waveplate and having a first linear polarization (e.g. s-polarization), into first diffused device light having an elliptical polarization (e.g. especially comprising both p-polarization and s-polarization), different from the first linear polarization. In such embodiments, one of the p-polarized first diffused device light and the s-polarized first diffused device light may propagate in an optical path to the light exit, whereas the other one of the p-polarized first diffused device light and the s-polarized first diffused device light may be rediffused by the second diffuser arrangement into second diffused device light, which may propagate in an optical path to the light exit. Hence, in such embodiments, the system light may comprise both the first diffused device light and the second diffused device light.

[0112] In embodiments, the system X / 2 waveplate may be configured to convert at least 40 %, of the first diffused device light received by the system X / 2 waveplate and having one of the first linear polarization and the second linear polarization into first diffused device light having the other one of the first linear polarization and the second linear polarization, like at least 50%, such as at least 60%, like at least 70%, especially at least 80% of the first diffused device light received by the system X / 2 waveplate. In specific embodiments, the system X / 2 waveplate may be configured to convert at least 90%, such as at least 95%, including essentially 100% of the first diffused device light received by the system X / 2 waveplate and having one of the first linear polarization and the second linear polarization into first diffused device light having the other one of the first linear polarization and the second linear polarization. Hence, in embodiments, 40-100% of the first diffused device light propagating from the system X / 2 waveplate may have a different (especially opposite) polarization from the first diffused device light received by the system X / 2 waveplate.

[0113] Moreover, in embodiments, the system X / 2 waveplate may be configured to transmit at most 60% of the first diffused device light received by the system X / 2 waveplate and having one of the first linear polarization and the second linear polarization without changing its respective polarization, such as at most 50%, like at most 40%, especially at most 30% of the first diffused device light received by the system X / 2 waveplate. In specific embodiments, the system X / 2 waveplate may be configured to transmit at most 20%, such as at most 10%,2024PF80318

[0114] 22

[0115] including essentially 0% of the first diffused device light received by the system X / 2 waveplate and having one of the first linear polarization and the second linear polarization without changing its respective polarization. Hence, in embodiments, 0-60% of the first diffused device light propagating from the system X / 2 waveplate may have essentially the same polarization as the first diffused device light received by the system X / 2 waveplate, i.e., of 0-60% of the first diffused device light received by the system X / 2 waveplate the polarization may remain unchanged. For example, in embodiments, (i) the first diffused device light received by the system X / 2 waveplate may be s-polarized light, (ii) the system X / 2 waveplate may be configured to convert 50% of the s-polarized first diffused device light received by the system X / 2 waveplate into p-polarized first diffused device light, and (iii) the system X / 2 waveplate may be configured to transmit 50% of the s-polarized first diffused device light received by the system X / 2 waveplate without changing its polarization. In another example, in embodiments, (i) the first diffused device light received by the system X / 2 waveplate may be p-polarized light, (ii) the system X / 2 waveplate may be configured to convert 100% of the p-polarized first diffused device light received by the system X / 2 waveplate into s-polarized first diffused device light, and (iii) the system X / 2 waveplate may be configured to transmit essentially none of the p-polarized first diffused device light received by the system X / 2 waveplate without changing its polarization, i.e., in such embodiments essentially no p-polarized first diffused device light may propagate from the system X / 2 waveplate in an optical path to the light exit.

[0116] Alternatively, in embodiments, the system X / 2 waveplate may be configured to convert first diffused device light received by the system X / 2 waveplate and having a first linear polarization (for example s-polarization), into first diffused device light having a second linear polarization (for example p-polarization), different from the first linear polarization. As such, in embodiments, the first diffused device light having the second linear polarization may propagate in an optical path to the second diffuser arrangement, where it may be rediffused into second diffused device light, which may propagate in an optical path to the light exit. Hence, in such embodiments, the system light may comprise (only) the second diffused device light.

[0117] The polarization control system may further comprise another X / 2 waveplate, configured in an optical path between the second redirection optical element and the light exit. In embodiments, this X / 2 waveplate may be configured (i) to convert linear polarized light having the first linear polarization into linear polarized light having the second linear2024PF80318

[0118] 23

[0119] polarization, and (ii) to convert linear polarized light having the second linear polarization into linear polarized light having the first linear polarization.

[0120] The polarization control system may, in embodiments, be configured to control the system X / 2 waveplate such that x% of the first diffused device light received by the system X / 2 waveplate from the first redirection optical element may be provided in an optical path to the second diffuser arrangement. In such embodiments, the polarization control system may further be configured to control the system X / 2 waveplate such that 100-x% of the first diffused device light received by the system X / 2 waveplate from the first redirection optical element bypasses the second diffuser arrangement. In embodiments, x may be selected from the range of 0-100%, such as from the range of 5-95%, like from the range of 10-90%. Moreover, in embodiments, x may be selected from the range of 20-80%, such as from the range of 30-70%, like from the range of 40-60%.

[0121] In embodiments, the polarization control system may thus comprise one or more retarder elements, especially one or more system X / 2 waveplates. Especially, in embodiments, the retarder elements may be configured to change the polarization of device light received by the retarder element in dependence of the orientation of the retarder element. Therefore, in embodiments, the retarder elements may comprise one or more of a birefringent rotator such as a X / 2 waveplate or a X / 4 waveplate, a liquid crystal polarization rotator, a Faraday rotator, a Fresnel rhomb, and a diffractive waveplate. Especially, in embodiments, the retarder elements may comprise the system X / 2 waveplate. However, in embodiments, other types of birefringent rotators (such as e.g. a X / 4 waveplate) may herein not be excluded. Hence, in embodiments, the system X / 2 waveplate may comprise a retarder plate.

[0122] In embodiments, the light generating system may further comprise a control system. The control system may especially be configured to control the polarization control system. As such, in embodiments, the control system may be configured to control rotation of the one or more system X / 2 waveplates. By changing the orientation of the retarder elements relative to an optical axis of the device light received by the retarder elements, the polarization of said device light may change.

[0123] Especially, the term “optical axis” may be defined as an imaginary line that defines the path along which light propagates through a system starting from the light generating element, here especially one of the light generating devices. Especially, the optical axis may coincide with the direction of the light with the highest radiant flux.2024PF80318

[0124] 24

[0125] Further, in embodiments, the control system may be configured to control one or more of a spectral power distribution, a correlated color temperature, a color gamut, and a color rendering index of the system light by controlling the first light generating device and optional further light generating devices (such as e.g. the second light generating device and / or the third light generating device). For example, in embodiments, the control system may be configured to control rotation of the light generating devices about their optical axis and / or to control a(n adjustable) drive current provided to the respective light generating device.

[0126] Note that, in embodiments, the orientations of the light generating devices as described above may also be factory set and fixated by a fixating means (such as e.g. a screw).

[0127] The term “controlling” and similar terms especially refer at least to determining the behavior or supervising the running of an element. Hence, herein “controlling” and similar terms may e.g. refer to imposing behavior to the element (determining the behavior or supervising the running of an element), etc., such as e.g. measuring, displaying, actuating, opening, shifting, changing temperature, etc.. Beyond that, the term “controlling” and similar terms may additionally include monitoring. Hence, the term “controlling” and similar terms may include imposing behavior on an element and also imposing behavior on an element and monitoring the element. The controlling of the element can be done with a control system, which may also be indicated as “controller”. The control system and the element may thus at least temporarily, or permanently, functionally be coupled. The element may comprise the control system. In embodiments, the control system and element may not be physically coupled. Control can be done via wired and / or wireless control. The term “control system” may also refer to a plurality of different control systems, which especially are functionally coupled, and of which e.g. one control system may be a master control system and one or more others may be slave control systems. A control system may comprise or may be functionally coupled to a user interface.

[0128] The control system may also be configured to receive and execute instructions from a remote control. In embodiments, the control system may be controlled via an App on a device, such as a portable device, like a Smartphone or I-phone, a tablet, etc.. The device is thus not necessarily coupled to the lighting system, but may be (temporarily) functionally coupled to the lighting system.

[0129] Hence, in embodiments the control system may (also) be configured to be controlled by an App on a remote device. In such embodiments the control system of the2024PF80318

[0130] 25

[0131] lighting system may be a slave control system or control in a slave mode. For instance, the lighting system may be identifiable with a code, especially a unique code for the respective lighting system. The control system of the lighting system may be configured to be controlled by an external control system which has access to the lighting system on the basis of knowledge (input by a user interface of with an optical sensor (e.g. QR code reader) of the (unique) code. The lighting system may also comprise means for communicating with other systems or devices, such as on the basis of Bluetooth, Thread, WIFI, LiFi, ZigBee, BLE or WiMAX, or another wireless technology.

[0132] The system, or apparatus, or device may execute an action in a “mode” or “operation mode” or “mode of operation” or “operational mode”. The term “operational mode may also be indicated as “controlling mode”. Likewise, in a method an action or stage, or step may be executed in a “mode” or “operation mode” or “mode of operation” or “operational mode”. This does not exclude that the system, or apparatus, or device may also be adapted for providing another controlling mode, or a plurality of other controlling modes. Likewise, this may not exclude that before executing the mode and / or after executing the mode one or more other modes may be executed.

[0133] However, in embodiments a control system may be available, that is adapted to provide at least the controlling mode. Would other modes be available, the choice of such modes may especially be executed via a user interface, though other options, like executing a mode in dependence of a sensor signal or a (time) scheme, may also be possible. The operation mode may in embodiments also refer to a system, or apparatus, or device, that can only operate in a single operation mode (i.e. “on”, without further tunability).

[0134] Hence, in embodiments, the control system may control in dependence of one or more of an input signal of a user interface, a sensor signal (of a sensor), and a timer. The term “timer” may refer to a clock and / or a predetermined time scheme.

[0135] In embodiments, the light generating system may especially comprise a first lighting arrangement comprising the first light generating device, the first diffuser arrangement, the second diffuser arrangement, and the one or more first optical elements. In other words, the first lighting arrangement may especially comprise the primary subarrangement comprising the first light generating device, the first diffuser arrangement, the second diffuser arrangement, and the one or more first optical elements. Further, in embodiments, the first lighting arrangement (of the light generating system) may comprise a secondary sub-arrangement.2024PF80318

[0136] 26

[0137] In embodiments, the secondary sub-arrangement may comprise a second light generating device, a secondary first diffuser arrangement, a secondary second diffuser arrangement, and second redirection optical elements. Especially, in embodiments, the secondary sub-arrangement may be configured to generate secondary sub-arrangement light.

[0138] In embodiments, the second light generating device may comprise a solid-state light source selected from the group of laser diodes, superluminescent diodes, and multijunction diodes. Especially, the second light generating device may be configured to generate second device light. In embodiments, the secondary sub-arrangement light may especially comprise the second device light. In specific embodiments, the second light generating device may comprise a second laser bank comprising a plurality of second lasers (i.e. especially second laser diodes). The spectral power distribution of the second device light may be selected from essentially any possible option, though in general with at least some spectral power, if not all, in the visible wavelength range. Hence, in embodiments the second device light may have spectral power at one or more wavelengths selected from the range of 380-780 nm. More especially, the second device light may have a peak wavelength in the wavelength range of 380-780 nm. Herein, in specific embodiments the second device light may have a peak wavelength in the wavelength range of 380-490 nm, more especially a peak wavelength in the wavelength range of 430-490 nm, such as a peak wavelength in the wavelength range of 440-490 nm. However, intensity at other wavelengths may also be possible, such as within the wavelength range of 620-780 nm.

[0139] In specific embodiments, the secondary sub-arrangement may be configured to generate secondary sub-arrangement light having a secondary wavelength (X22) selected from the wavelength range of 485-600, such as selected from the range of 500-590 nm, like selected from the range of 510-580 nm.

[0140] Further, in embodiments, the secondary first diffuser arrangement may comprise a secondary first diffuser and a secondary first X / 4 waveplate. In embodiments, the secondary first diffuser may be configured in the reflective mode. Furthermore, in embodiments, the secondary diffuser arrangement may be configured to convert at least part of the second device light received by the secondary diffuser arrangement and having the second linear polarization into secondary first diffused device light having the first linear polarization.

[0141] Yet further, in embodiments, the secondary second diffuser arrangement may comprise a secondary second diffuser and a secondary second / 4 waveplate. Especially, the secondary second diffuser may be configured in the reflective mode. In further embodiments,2024PF80318

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[0143] the secondary second diffuser arrangement may be configured to convert at least part of the secondary first diffused device light received by the secondary second diffuser arrangement and having one of the first linear polarization and the second linear polarization into secondary second diffused device light having the other one of the first linear polarization and the second linear polarization. Embodiments as described above for the first diffuser arrangement and the second diffuser arrangement may further similarly apply to the secondary first diffuser arrangement and the secondary second diffuser arrangements.

[0144] Further, in embodiments, the second redirection optical elements may comprise at least a secondary first redirection optical element. In embodiments, the secondary first redirection optical element may be configured in an optical path between the second light generating device and the secondary first diffuser arrangement. Additionally, in embodiments, the secondary first redirection optical element may be configured in an optical path between the secondary first diffuser arrangement and the secondary second diffuser arrangement. Yet additionally, in embodiments, the secondary first redirection optical element may be configured in an optical path between the secondary second diffuser arrangement and the light exit.

[0145] The secondary first redirection optical element may further, in embodiments, be configured to transmit the second device light received by the secondary first redirection optical element in an optical path to the secondary first diffuser arrangement. Alternatively, in embodiments, the secondary first redirection optical element may be configured to reflect the second device light received by the secondary first redirection optical element in an optical path to the secondary first diffuser arrangement. Additionally, in embodiments, the secondary first redirection optical element may be configured to reflect the secondary first diffused device light received by the secondary first redirection optical element in an optical path to the secondary second diffuser arrangement. Alternatively, in embodiments, the secondary first redirection optical element may be configured to transmit the secondary first diffused device light received by the secondary first redirection optical element in an optical path to the secondary second diffuser arrangement.

[0146] Moreover, in embodiments, the second redirection optical elements may be configured to reflect the secondary first diffused device light received from the secondary first diffuser arrangement and having one of the first linear polarization and the second linear polarization in an optical path to the secondary second diffuser arrangement. Alternatively, in embodiments, the second redirection optical elements may be configured to transmit the secondary first diffused device light received from the secondary first diffuser arrangement2024PF80318

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[0148] and having one of the first linear polarization and the second linear polarization in an optical path to the secondary second diffuser arrangement. Additionally, in embodiments, the second redirection optical elements may be configured to transmit the secondary second diffused device light received from the secondary second diffuser arrangement and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit. Alternatively, in embodiments, the second redirection optical elements may be configured to reflect the secondary second diffused device light received from the secondary second diffuser arrangement and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit.

[0149] Further, in embodiments, the light generating system (especially the optics) may comprise a first beam combiner. In embodiments, the first beam combiner may be configured downstream of both the primary sub-arrangement and the secondary subarrangement. The first beam combiner may especially be configured to combine (i) the second diffused device light received by the first beam combiner 505 from the primary subarrangement and (ii) the secondary second diffused device light received by the first beam combiner from the secondary sub-arrangement in the same optical path to the light exit. In embodiments, the first beam combiner may especially do so by reflecting one of the second diffused device light and the secondary second diffused device light and transmitting the other one of the second diffused device light and the secondary second diffused device light in dependence of their respective linear polarizations. Hence, in embodiments, the first beam combiner may comprise a polarizing beam combiner (or polarizing beam splitter).

[0150] As such, in embodiments, the light generating system may be configured to provide, in an operational mode of the light generating system, via the light exit, system light comprising at least part of the secondary second diffused device light. Moreover, in embodiments, the system light (comprising at least part of both the second diffused device light and the secondary second diffused device light) may be unpolarized light. Unpolarized light may herein be defined as light having a random, time-varying polarization. Unpolarized light may especially be produced from the incoherent combination of vertical and horizontal linearly polarized light (i.e., p-polarization or s-polarization), or right- and left-handed circularly polarized light. Hence, unpolarized light may also be described as a mixture of two independent oppositely polarized streams, each with half the intensity.

[0151] In some embodiments, the light generating system may especially comprise a depolarizer configured (i) downstream of the first redirection optical element, (ii) downstream of the second redirection optical element and / or third redirection optical2024PF80318

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[0153] element, and (iii) upstream of the light exit. In specific embodiments, the depolarizer may be configured downstream of (one or both of) the diffuser arrangement(s), especially downstream of the second diffuser arrangement. A so-called depolarizer may act on polarized light to create a beam of light in which the polarization vary so rapidly across the beam that it may be ignored in the intended applications. Conversely, a polarizer may act on unpolarized light or arbitrarily polarized light to create a beam of light which is polarized.

[0154] Hence, alternatively, in embodiments, the system light (comprising at least part of both the second diffused device light and the secondary second diffused device light) may be polarized light comprising multiple (linear) polarizations, especially both p- and s-polarization). Such embodiments may be beneficial a higher power diffused device light may be achieved for any desired spectral power distribution in a robust and eye-safe manner due to the combination of both linear polarizations while using a reflective double diffusion system.

[0155] In embodiments, the light generating system may comprise the first lighting arrangement, which comprises (at least) the primary sub-arrangement (and optionally the secondary sub-arrangement). As such, in embodiments, the first lighting arrangement may be configured to generate first arrangement light having a first wavelength (XI) selected from the wavelength range of 440-490 nm. Hence, the first lighting arrangement may be configured to provide blue light. In embodiments, the system light may comprise at least part of the first arrangement light. Moreover, in embodiments, the first arrangement light may comprise one or more of primary sub-arrangement light and secondary sub-arrangement light. Such embodiments may be beneficial as the light generating system as described herein may comprise an architecture configured such that the system light may comprise blue light comprising both (s and p) linear polarizations.

[0156] Furthermore, in embodiments the light generating system may further comprise a second lighting arrangement comprising a second primary sub-arrangement and optionally the secondary sub-arrangement. In such embodiments, the second lighting arrangement may be configured to generate second arrangement light having a second wavelength ( 2) selected from the wavelength range of 500-590 nm. Hence, the second lighting arrangement may be configured to provide green light. In embodiments, the system light may further comprise at least part of the second arrangement light. Therefore, in embodiments, the optics may further comprise a second beam combiner. In embodiments, the second beam combiner may be configured to combine the first arrangement light and the second arrangement light into the same optical path to the light exit. The second beam2024PF80318

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[0158] combiner may especially do so in dependence of the spectral power distributions of the different types of light, i.e., the second beam combiner may comprise a spectral beam combiner. Alternatively, in embodiments, the first arrangement light and the second arrangement light may be combined using the first beam combiner. Such embodiments may be beneficial as the light generating system as described herein may comprise an architecture configured such that the system light may comprise green light comprising both (s and p) linear polarizations.

[0159] Furthermore, in embodiments, the light generating system may further comprise a third lighting arrangement comprising a third primary sub-arrangement (and optionally the secondary sub-arrangement). In such embodiments, third lighting arrangement may be configured to generate third arrangement light having a third wavelength (X3) selected from the wavelength range of 590-700 nm, such as from the range of 600-690 nm, like from the range of 610-680 nm. Hence, the third lighting arrangement may be configured to provide red light. In embodiments, in embodiments, the system light may further comprise at least part of the third arrangement light. Therefore, in embodiments such as depicted here, the optics may further comprise a third beam combiner. In embodiments, the third beam combiner may be configured to combine the first arrangement light, the second arrangement light, and the third arrangement light into the same optical path to the light exit. The third beam combiner may especially do so in dependence of the spectral power distributions of the different types of light, i.e., the third beam combiner may comprise a spectral beam combiner. Additionally or alternatively, in embodiments, two or more of the first arrangement light, the second arrangement light, and the third arrangement light may be combined using the first beam combiner. Additionally or alternatively, two or more of the first arrangement light, the second arrangement light, and the third arrangement light may be combined using the second beam combiner. Such embodiments may be beneficial as the light generating system as described herein may comprise an architecture configured such that the system light may comprise blue light comprising both (s and p) linear polarizations.

[0160] Yet further, in embodiments, the light generating system may further comprise a third light generating device, a multi chroic beam combiner, and a luminescent material.

[0161] In embodiments, the third light generating device may comprise a solid-state light source selected from the group of diode lasers, superluminescent diodes, and multijunction diodes. Especially, the third light generating device may be configured to generate third device light. In specific embodiments, the third light generating device may comprise a third laser bank comprising a plurality of third lasers (i.e. especially third laser diodes). The2024PF80318

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[0163] spectral power distribution of the third device light may be selected from essentially any possible option, though in general with at least some spectral power, if not all, in the visible wavelength range. Hence, in embodiments the third device light may have spectral power at one or more wavelengths selected from the range of 380-780 nm. More especially, the third device light may have a peak wavelength in the wavelength range of 380-780 nm. Herein, in specific embodiments the third device light may have a peak wavelength in the wavelength range of 380-490 nm, more especially a peak wavelength in the wavelength range of 430-490 nm, such as a peak wavelength in the wavelength range of 440-490 nm. However, intensity at other wavelengths may also be possible, such as within the wavelength range of 620-780 nm.

[0164] Further, in embodiments, the luminescent material may be configured in a light-receiving relationship with the third light generating device. As such, in embodiments, the luminescent material may be configured to convert at least part of the third device light received by the luminescent material into luminescent material light. Especially, in embodiments, the luminescent material may be configured to convert at least 60%, such as at least 70%, especially at least 80%, more especially at least 90% of the third device light received by the luminescent material into luminescent material light. Especially, in embodiments, the luminescent material may be configured to convert at least 95%, especially at least 98%, including essentially 100% of the third device light received by the luminescent material into luminescent material light. Further, in embodiments, the luminescent material may be configured to convert at most 100%, such as at most 98%, especially at most 95%, more especially at most 90% of the third device light received by the luminescent material into luminescent material light. Note that the herein indicated percentages for luminescent conversion may refer to a quantum efficiency, i.e., a conversion efficiency from incident photons to luminescent photons. Alternatively, the efficiency of the luminescent material may be indicated with its energy conversion efficiency. Due to heat dissipation (i.e. thermal losses) caused by Stokes losses the energy conversion efficiency of the luminescent material may be configured to convert at most 90% (energy conversion efficiency), such as at most 88%, especially at most 85% of the device light (especially first device light and the part of the second device light) received by the luminescent material into luminescent material light.

[0165] The term “luminescent material” especially refers to a material that can convert first radiation, (especially one or more of UV radiation and blue radiation,) into second radiation. In general, the first radiation and second radiation have different spectral power distributions. Hence, instead of the term “luminescent material”, also the terms “luminescent converter” or “converter” may be applied. Further, instead of the term2024PF80318

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[0167] “luminescent material” also the term “phosphor” may be applied. These terms are known to the person skilled in the art. In general, the second radiation has a spectral power distribution at larger wavelengths than the first radiation, which is the case in the so-called downconversion. In specific embodiments, however the second radiation has a spectral power distribution with intensity at smaller wavelengths than the first radiation, which is the case in the so-called up-conversion. In embodiments, the “luminescent material” may especially refer to a material that can convert radiation into e.g. visible and / or infrared light. For instance, in embodiments the luminescent material may be able to convert one or more of UV radiation and blue radiation into visible light. The luminescent material may in specific embodiments also convert radiation into infrared radiation (IR). Hence, upon excitation with radiation, the luminescent material emits radiation. In general, the luminescent material will be a down converter, i.e. radiation of a smaller wavelength is converted into radiation with a larger wavelength (Xex<Xem), though in specific embodiments the luminescent material may comprise up-converter luminescent material, i.e. radiation of a larger wavelength is converted into radiation with a smaller wavelength (Xex>Xem). The term “luminescent material” may also refer to a plurality of different luminescent materials.

[0168] In embodiments, luminescent materials are selected from garnets and nitrides, especially doped with trivalent cerium or divalent europium, respectively. The term “nitride” may also refer to oxynitride or nitridosilicate, etc. Alternatively or additionally, the luminescent material(s) may be selected from silicates, especially doped with divalent europium.

[0169] Especially, the luminescent material is configured to convert at least part of the light source light into luminescent material light, wherein the luminescent material may comprise a (garnet) luminescent material of the type AsBsOn Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc. Hence, the luminescent material light may e.g. be green light or yellow light (or in specific embodiments even orange (dependent upon the composition of the garnet and cerium concentration)). However, other embodiments are also possible, see below. In embodiments, 0.05-10% of the A elements comprise Ce, even more especially 0.05-5%, such as 0.1-5%. Especially, embodiments, 0.1-3% of the A elements comprise Ce, such as up to 2%, like selected from the range of 0.1-1.5%, such as at least above 0.5%.

[0170] Alternatively or additionally, the luminescent material may comprise a luminescent material of the type AsSieNiuCe3, wherein A comprises one or more of Y, La, Gd, Tb and Lu, such as in embodiments one or more of La and Y. In specific embodiments,2024PF80318

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[0172] the luminescent material may comprise at least two different luminescent materials configured to provide luminescent material light having different spectral power distributions. As can be derived from the above, the term “different luminescent materials” may refer to luminescent materials that are different, or to two compositions, each including at least one luminescent material in common, but wherein the compositions differ.

[0173] In embodiments, the luminescent material may alternatively or additionally comprise one or more of MS:Eu2+and / or I hSisNs Eu2and / or MAlSiNs Eu2and / or Ca2AlSi3O2Ns:Eu2+, etc., wherein M comprises one or more of Ba, Sr and Ca, especially in embodiments at least Sr. Hence, in embodiments, the luminescent material may comprise one or more materials selected from the group consisting of (Ba,Sr,Ca)S:Eu, (Ba,Sr,Ca)AlSiN3:Eu and (Ba,Sr,Ca)2SisN8:Eu.

[0174] In embodiments, the luminescent material may comprise a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, for instance comprising one or more of silicon and titanium, wherein X comprises a monovalent anion, at least comprising fluorine. Relevant alkaline cations (M) are sodium (Na), potassium (K) and rubidium (Rb). Optionally, also lithium and / or cesium may be applied. In a preferred embodiment, M comprises at least potassium. In yet another embodiment, M comprises at least rubidium. The phrase “wherein M comprises at least potassium” indicates for instance that of all M cations in a mole M’XM2-2XAXe , a fraction comprises K+and an optionally remaining fraction comprises one or more other monovalent (alkaline) cations (see also below). In another preferred embodiment, M comprises at least potassium and rubidium. The term “tetravalent manganese” refers to Mn4+. This is a well-known luminescent ion. In the formula as indicated above, part of the tetravalent cation A (such as Si) is being replaced by manganese. In an embodiment, M’XM2-2xAXe comprises K^SiFe (indicated herein also as KSiF system). As indicated above, in another preferred embodiment, M’xM2-2xAX6 comprises KRbSiFe (herein also indicated as K,Rb system). As indicated above, part of silicon is replaced by manganese (i.e. the formula may also be described as K2Sii-mMnmF6 or KRbSii-mMnmF6, with m as indicated above, or as KRbSiFe:Mn and K2SiFe:Mn, respectively).

[0175] Hence, in embodiments, the light generating system may comprise a luminescent material configured to convert the third device light into luminescent material light. As described above, the light generating system may further comprise a multichroic beam combiner. The multichroic beam combiner may, in embodiments, be configured in an2024PF80318

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[0177] optical path between the third light generating device and the luminescent material. In embodiments, the multichroic beam combiner may be configured to transmit or reflect the third device light received by the multichroic beam combiner from the third light generating device in an optical path to the luminescent material.

[0178] Additionally, in embodiments where the luminescent material may be configured in the reflective mode, the multichroic beam combiner may be configured in an optical path between the luminescent material and the light exit. In such embodiments, the multichroic beam combiner may be configured to reflect or transmit the luminescent material light received by the multichroic beam combiner from the luminescent material in an optical path to the light exit.

[0179] In some embodiments, one of the first beam combiner, the second beam combiner, and the third beam combiner may be configured to combine the luminescent material light with the first (and optionally second, and / or third) arrangement light, such that the luminescent material light may be provided to the light exit together with the diffused device light. Alternatively, in embodiments, the light generating system may comprise yet another beam combiner configured to combine the luminescent material light with the first (and optionally second, and / or third) arrangement light, such that the luminescent material light may be provided to the light exit together with the diffused device light. Hence, in embodiments, the light generating system may be configured to provide, in an operational mode of the light generating system, via the light exit, system light comprising at least part of the luminescent material light.

[0180] As indicated above, the light generating system may comprise optics. The term “optics” may especially refer to (one or more) optical elements. Hence, the terms “optics” and “optical elements” may refer to the same items. The optics may include one or more of (specular or surface textured) mirrors, reflectors, collimators, lenses, prisms, diffusers, phase plates, polarizers, diffractive elements, gratings, dichroics, selectively reflective and / or selectively transmissive optics, arrays of one or more of the afore-mentioned, etc.

[0181] Alternatively or additionally, the term “optics” may refer to a holographic element or a mixing rod. In embodiments, the optics may include one or more of beam expander optics and zoom lens optics. See further above for examples of optics. In embodiments, the optics may comprise an integrator, like a “Koehler integrator” (or “Kohler integrator”). In specific embodiments, the optics may comprise one or more of an integrating (or “homogenizing”) optics, collimating optics, condensing optics, and reflecting optics. For example, in embodiments, the luminescent material light and the diffused laser light may be provided2024PF80318

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[0183] (e.g. by the second redirection optical element as defined above) along the same optical path to the light exit, and the optics may comprise a beam homogenizer configured upstream of the light exit and configured to combine and homogenize the received light and to provide (homogenized white) system light to the light exit.

[0184] The light generating system may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, greenhouse lighting systems, horticulture lighting, digital projection, or LCD backlighting. The light generating system (or luminaire) may be part of or may be applied in e.g. optical communication systems or disinfection systems.

[0185] Therefore, in embodiments, in an operational mode of the light generating system, the system light may be white light. Especially, in embodiments, in an operational mode of the light generating system, the system light may be white light having a correlated color temperature selected from the range of 1500-12000 K, such as from the range of 1700-12000 K, such as at least about 3000 K, or such as from the range of 4000-9000 K, and a color rendering index of at least 65.

[0186] The term “white light”, and similar terms, herein, is known to the person skilled in the art. It may especially relate to light having a correlated color temperature (CCT) between about 1800 K and 20000 K, such as between 2000 and 20000 K, especially 2700-20000 K, for general lighting especially in the range of about 2000-7000 K, such as in the range of 2700 K and 6500 K. In embodiments, e.g. for backlighting purposes, or for other purposes, the correlated color temperature (CCT) may especially be in the range of about 7000 K and 20000 K. Yet further, in embodiments the correlated color temperature (CCT) is especially within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within about 10 SDCM from the BBL, even more especially within about 5 SDCM from the BBL.

[0187] In specific embodiments, the correlated color temperature (CCT) may be selected from the range of 6000-12000 K, like selected from the range of 7000-12000 K, like at least 8000 K. Yet further, in embodiments the correlated color temperature (CCT) may be2024PF80318

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[0189] selected from the range of 6000-12000 K, like selected from the range of 7000-12000 K, in combination with a CRI of at least 70.

[0190] In an embodiment, the light source may also provide light source light having a correlated color temperature (CCT) between about 5000 and 20000 K, e.g. direct phosphor converted LEDs (blue light emitting diode with thin layer of phosphor for e.g. obtaining of 10000 K). Hence, in a specific embodiment the light source is configured to provide light source light with a correlated color temperature in the range of 5000-20000 K, even more especially in the range of 6000-20000 K, such as 8000-20000 K. An advantage of the relative high color temperature may be that there may be a relatively high blue component in the light source light.

[0191] The terms “light” and “radiation” are herein interchangeably used, unless clear from the context that the term “light” only refers to visible light. The terms “light” and “radiation” may thus refer to UV radiation, visible light, and IR radiation. In specific embodiments, especially for lighting applications, the terms “light” and “radiation” refer to (at least) visible light.

[0192] The terms “visible”, “visible light” or “visible emission” and similar terms refer to light having one or more wavelengths in the range of about 380-780 nm. Herein, UV may especially refer to a wavelength selected from the range of 190-380 nm, such as 200-380 nm. The terms “violet light” or “violet emission” especially relates to light having a wavelength in the range of about 380-440 nm. The terms “blue light” or “blue emission” especially relates to light having a wavelength in the range of about 440-495 nm (including some violet and cyan hues). The terms “green light” or “green emission” especially relate to light having a wavelength in the range of about 495-570 nm. The terms “yellow light” or “yellow emission” especially relate to light having a wavelength in the range of about 570-590 nm. The terms “orange light” or “orange emission” especially relate to light having a wavelength in the range of about 590-620 nm. The terms “red light” or “red emission” especially relate to light having a wavelength in the range of about 620-780 nm. The term “pink light” or “pink emission” refers to light having a blue and a red component. The term “cyan” may refer to one or more wavelengths selected from the range of about 490-520 nm. The term “amber” may refer to one or more wavelengths selected from the range of about 585-605 nm, such as about 590-600 nm. The phrase “light having one or more wavelengths in a wavelength range” and similar phrases may especially indicate that the indicated light (or radiation) has a spectral power distribution with at least intensity or intensities at these one or more wavelengths in the indicate wavelength range. For instance, a blue emitting solid state2024PF80318

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[0194] light source will have a spectral power distribution with intensities at one or more wavelengths in the 440-495 nm wavelength range.

[0195] In yet a further aspect, the invention also provides a lamp or a luminaire comprising the light generating system as defined herein. The luminaire may further comprise a housing, optical elements, louvres, etc. etc... The lamp or luminaire may further comprise a housing enclosing the light generating system. The lamp or luminaire may comprise a light window in the housing or a housing opening, through which the system light may escape from the housing. In yet a further aspect, the invention also provides a projection device comprising the light generating system as defined herein. Especially, a projection device or “projector” or “image projector” may be an optical device that projects an image (or moving images) onto a surface, such as e.g. a projection screen. The projection device may include one or more light generating systems such as described herein. Hence, in an aspect the invention also provides a lighting device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the light generating system as defined herein. The lighting device may comprise a housing or a carrier, configured to house or support, one or more elements of the light generating system. For instance, in embodiments the lighting device may comprise a housing or a carrier, configured to house or support one or more of the sub-arrangements as described herein.

[0196] In yet a further aspect, the invention also provides a lighting fixture comprising the light generating system as defined herein. Hence, in yet a further aspect, the light generating system may comprise a device selected from the group of a lamp, a luminaire, or a lighting fixture, wherein the lamp, luminaire, or lighting fixture may comprise one or more elements of the light generating system, such as the first light generating device, the diffuser arrangement, the patterned reflector, and the optics, etc., and the light generating system may further comprise e.g. a control system configured to control the device. In embodiments, the lamp or luminaire may be a downlighter or an uplighter. In embodiments, the lamp may comprise a torch.

[0197] BRIEF DESCRIPTION OF THE DRAWINGS

[0198] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which:2024PF80318

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[0200] Figs. 1-5 schematically depict some embodiments of the light generating system.

[0201] Fig. 6 schematically depicts some applications of the light generating system in lighting devices.

[0202] The schematic drawings are not necessarily to scale.

[0203] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0204] Fig. 1 schematically depicts a light generating system 1000 comprising (a first lighting arrangement 1100 comprising) a primary sub-arrangement 1110 and a light exit 1090. In embodiments, the primary sub-arrangement 1110 may comprise a first light generating device 110, a first diffuser arrangement 700, a second diffuser arrangement 2700, and one or more first optical elements 1500.

[0205] The first light generating device 110 may, in embodiments, comprise a solid-state light source selected from the group of laser diodes, superluminescent diodes, and multi -junction diodes. Especially, in embodiments, the first light generating device 110 may comprise a first laser bank comprising a plurality of first lasers 10. Further, in embodiments, the first light generating device 110 may be configured to provide first device light 111. Moreover, in embodiments, the first device light 111 may be polarized light. For example, in embodiments, the first device light 111 may be linear polarized light.

[0206] In embodiments, the first diffuser arrangement 700 may be configured in a light receiving relationship with the first light generating device 110 (via one or more of the first optical elements 1500). The first diffuser arrangement 700 may especially comprise a first diffuser 710 and a first X / 4 waveplate 720. In embodiments, the first diffuser 710 may be configured in the reflective mode. Further, in embodiments, the diffuser arrangement 700 may be configured to convert at least part of the first device light 111 received by the diffuser arrangement 700 and having a first linear polarization into first diffused device light 711 having a second linear polarization, different from the first linear polarization.

[0207] Further, in embodiments, the second diffuser arrangement 2700 may be configured in a light receiving relationship with the first diffuser arrangement 700 (via one or more of the first optical elements 1500). Similarly to the first diffuser arrangement 700, in embodiments, the second diffuser arrangement 2700 may comprise a second diffuser 2710 and a second X / 4 waveplate 2720. Moreover, in embodiments, the second diffuser 2710 may be configured in the reflective mode. Especially, in embodiments, the second diffuser arrangement 2700 may be configured to convert at least part of the first diffused device light2024PF80318

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[0209] 711 received by the second diffuser arrangement 2700 and having one of the first linear polarization and the second linear polarization into second diffused device light 2711. In such embodiments, the second diffused device light 2711 may especially have the other one of the first linear polarization and the second linear polarization.

[0210] In further embodiments, the one or more first optical elements 1500 may comprise at least a first redirection optical element 510. In embodiments, the first redirection optical element 510 may be configured in an optical path between the first light generating device 111 and the first diffuser arrangement 700. As such, the first redirection optical element 510 may be configured to direct the first device light 111 received by the first redirection optical element 510 into an optical path to the first diffuser arrangement 700. Especially, in embodiments as depicted in Fig. 2A, the first redirection optical element 510 may be configured to transmit the first device light 111 received by the first redirection optical element 510 and having the first linear polarization (here p-polarization) in an optical path to the first diffuser arrangement 700. Alternatively, in embodiments as depicted in Fig.

[0211] 1, the first redirection optical element 510 may be configured to reflect the first device light 111 received by the first redirection optical element 510 and having the first linear polarization (here s-polarization) in an optical path to the first diffuser arrangement 700.

[0212] Further, in embodiments, the first redirection optical element 510 may be configured in an optical path between the first diffuser arrangement 700 and the second diffuser arrangement 2700. As such, the first redirection optical element 510 may be configured to direct the first diffused device light 711 received by the first redirection optical element 510 into an optical path to the second diffuser arrangement 2700. Especially, in embodiments as depicted in Fig. 2A, the first redirection optical element 510 may be configured to reflect the first diffused device light 711 received by the first redirection optical element 510 and having the second linear polarization (here s-polarization) in an optical path to the second diffuser arrangement 2700. Alternatively, in embodiments as depicted in Fig. 1, the first redirection optical element 510 may be configured to transmit the first diffused device light 711 received by the first redirection optical element 510 and having the second linear polarization (here p-polarization) in an optical path to the second diffuser arrangement 2700.

[0213] As depicted on Fig. 1, especially, the one or more first optical elements 1500 may be configured to (i) reflect the first diffused device light 711 received from the first diffuser arrangement 700 and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement 2700 and (ii) transmit the2024PF80318

[0214] 40

[0215] second diffused device light 2711 received from the second diffuser arrangement 2700 and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit 1090.

[0216] In alternative embodiments, not depicted, the one or more first optical elements 1500 may be configured to (i) transmit the first diffused device light 711 received from the first diffuser arrangement 700 and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement 2700 and (ii) reflect the second diffused device light 2711 received from the second diffuser arrangement 2700 and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit 1090.

[0217] In embodiments, the light generating system 1000 may thus be configured to provide, in an operational mode of the light generating system 1000, via the light exit 1090, system light 1001 comprising at least part of the second diffused device light 2711.

[0218] Going into further detail, in embodiments, the first diffuser 710 may comprise a polarization maintaining diffuser. The first diffuser 710 may especially be configured in a light receiving relationship with the first light generating device 110 via the first redirection optical element 510. As such, the first diffuser 710 may be configured to diffuse at least part of the first device light 111 received by the first diffuser 710 into first diffused device light 711.

[0219] Further, in embodiments, the first X / 4 waveplate 720 may be configured in an optical path between the first redirection optical element 510 and the first diffuser 710. As such, in embodiments, the first redirection optical element 510 may be configured to direct first device light 111, received by the first redirection optical element 510, to the first X / 4 waveplate 720. The first X / 4 waveplate 720 may then, in embodiments, be configured to direct first device light 111 received by the first X / 4 waveplate 720 from the first redirection optical element 510 to the first diffuser 710. Furthermore, in embodiments, the first X / 4 waveplate 720 may be configured to convert the first device light 111 received by the first X / 4 waveplate 720 and having a linear polarization into first device light 111 having a first elliptical (such as circular) polarization. The first device light 111 having the first elliptical polarization may be diffused by the first diffuser 710 into first diffused device light 711 having a second elliptical polarization, different from the first elliptical polarization.

[0220] Additionally, in embodiments, the first X / 4 waveplate 720 may be configured to direct first diffused device light 711 received by the first X / 4 waveplate 720 from the first diffuser 710 to the first redirection optical element 510. Furthermore, in embodiments, the2024PF80318

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[0222] first X / 4 waveplate 720 may be configured to convert the first diffused device light 711 received by the first X / 4 waveplate 720 and having the second elliptical polarization into first device light 111 having another linear polarization. Especially, in embodiments, the first device light 111, received by the first redirection optical element 510 from the first light generating device 110, may have the first linear polarization and the first diffused device light 711, received by the first redirection optical element 510 via the first X / 4 waveplate 720, may have the second linear polarization.

[0223] Similarly, in embodiments, the second diffuser 2710 may comprise a polarization maintaining diffuser. Furthermore, in embodiments, the second diffuser 2710 may be configured in a light receiving relationship with the first diffuser arrangement 700 via the first redirection optical element 510 (and the second redirection optical element 520). As such, the second diffuser 2710 may be configured to diffuse at least part of the first diffused device light 2711 received by the second diffuser 2710 into second diffused device light 2711.

[0224] Further, in embodiments, the second X / 4 waveplate 2720 may be configured in an optical path between the first redirection optical element 510 (especially between the second redirection optical element 520) and the second diffuser 710. As such, in embodiments, the one or more first optical elements 1500 may be configured to direct first diffused device light 711, received from the first diffuser arrangement 700, to the second X / 4 waveplate 2720. The second X / 4 waveplate 2720 may then, in embodiments, be configured to direct first diffused device light 711 received by the second X / 4 waveplate 2720 from first diffuser arrangement 700 to the second diffuser 2710. Furthermore, in embodiments, the second X / 4 waveplate 2720 may be configured to convert the first diffused device light 711 received by the second X / 4 waveplate 2720 and having a linear polarization into first diffused device light 711 having the second elliptical (such as circular) polarization. The first diffused device light 711 having the second elliptical polarization may be diffused by the second diffuser 2710 into second diffused device light 2711 having the first elliptical polarization.

[0225] Additionally, in embodiments, the second X / 4 waveplate 2720 may be configured to direct second diffused device light 2711 received by the second X / 4 waveplate 2720 from the second diffuser 2710 in an optical path to the light exit 1090. Furthermore, in embodiments, the second X / 4 waveplate 2720 may be configured to convert the second diffused device light 2711 received by the second X / 4 waveplate 2720 and having the first elliptical polarization into second diffused device light 2711 having another linear polarization.2024PF80318

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[0227] In embodiments, one or more of the first diffuser 710 and the second diffuser 2710 may each (individually) be configured on a support 1250. In embodiments, the support 1250 may especially comprise a thermally conductive support, such as a heat sink and / or a rotating support.

[0228] Further, the light generating system may comprise optics 500. In embodiments, the optics 500 may comprise the first optical element 1500. Further, in embodiments, the optics 500 may comprise one or more lenses 550, one or more reflectors 560 (see also further below), and one or more optical integrators 570.

[0229] Fig. 2A schematically depicts a variation on the embodiment as depicted in Fig. 1. Here in Fig. 2A, the one or more first optical elements 1500 may further comprise a second redirection optical element 520. The second redirection optical element 520 may especially be configured in an optical path between the first diffuser arrangement 700 (here especially between the first redirection optical element 510) and the second diffuser arrangement 2700. Furthermore, the second redirection optical element 520 may be configured in an optical path between the second diffuser arrangement 2700 and the light exit 1090. As such, in embodiments as depicted in Fig. 2A, the second redirection optical element 520 may be configured to reflect the first diffused device light 711 received by the second redirection optical element 520 and having one of the first linear polarization and the second linear polarization (here especially s-polarization) in an optical path to the second diffuser arrangement 2700. Alternatively, in embodiments (not depicted), the second redirection optical element 520 may be configured to transmit the first diffused device light 711 received by the second redirection optical element 520 and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement 2700.

[0230] Further, in embodiments as depicted in Fig. 2A, the second redirection optical element 520 may be configured to transmit the second diffused device light 2711 received by the second redirection optical element 520 and having the other one of the first linear polarization and the second linear polarization (here especially p-polarization) in an optical path to the light exit 1090. Alternatively, in embodiments, the second redirection optical element 520 may be configured to reflect the second diffused device light 2711 received by the second redirection optical element 520 and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit 1090.

[0231] Fig. 2B schematically depicts a variation on the embodiment as depicted in Fig. 2A. Here in Fig. 2B, the one or more first optical elements 1500 may further comprise a second redirection optical element 520. The second redirection optical element 520 may2024PF80318

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[0233] especially be configured in an optical path between the first diffuser arrangement 700(, here especially between the first redirection optical element 510) and the second diffuser arrangement 2700. Furthermore, the second redirection optical element 520 may be configured in an optical path between the second diffuser arrangement 2700 and the light exit 1090.

[0234] Furthermore, in embodiments, (the first optical element 1500 of) the light generating system may comprise a third redirection optical element 530, and a fourth redirection optical element 540.

[0235] In embodiments, the third redirection optical element 530 may be configured in an optical path between the first redirection optical element 510 and the light exit 1090. Additionally, in some embodiments such as depicted here in Fig. 2B, the third redirection optical element 530 may be configured in an optical path between the first redirection optical element 510 and the second redirection optical element 520. The third redirection optical element 530 may, in embodiments, be configured to transmit at least part of the first diffused device light 711 received by the third redirection optical element 530 (from the first redirection optical element 510) in an optical path to the second redirection optical element 520 and reflect at least another part of the first diffused device light 711 received by the third redirection optical element 530 (from the first redirection optical element 510) in an optical path to the light exit 1090.

[0236] However, this may not necessarily be the case. For example, in some embodiments, the third redirection optical element 530 and the second redirection optical element 520 may be comprised by the same singular element. Hence, in such embodiments, the third redirection optical element 530 is not necessarily configured in an optical path between the first redirection optical element 510 and the second redirection optical element 520, as it is comprised by (and thus collocated with) the second redirection optical element 520. Further, in such embodiments, the (combined second redirection optical element 520 and) third redirection optical element 530 may be configured to transmit at least part of the first diffused device light 711 received by the third redirection optical element 530 (from the first redirection optical element 510) in an optical path to the light exit 1090 (optionally via one or more reflectors 560) and reflect at least another part of the first diffused device light 711 received by the third redirection optical element 530 (from the first redirection optical element 510) in an optical path to the second diffuser arrangement 2700.

[0237] In embodiments, the fourth redirection optical element 540 may be configured in an optical path between the third redirection optical element 530 and the light exit 1090.2024PF80318

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[0239] Additionally, in embodiments, fourth redirection optical element 540 may be configured in an optical path between the second redirection optical element 520 and the light exit 1090. As depicted in Fig. 2B, the fourth redirection optical element 540 may especially be configured to (a) transmit second diffused device light 2711 received by the fourth redirection optical element 540 (from the second redirection optical element 520) and having one of the first linear polarization and the second linear polarization in an optical path to the light exit 1090 and (b) reflect first diffused device light 711 received by the fourth redirection optical element 540 (from the third redirection optical element 530) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit 1090. Alternatively, in embodiments (not depicted), the fourth redirection optical element 540 may especially be configured to (a) reflect second diffused device light 2711 received by the fourth redirection optical element 540 (from the second redirection optical element 520) and having one of the first linear polarization and the second linear polarization in an optical path to the light exit 1090 and (b) transmit first diffused device light 711 received by the fourth redirection optical element 540 (from the third redirection optical element 530) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit 1090.

[0240] Hence, in embodiments as depicted here, at least part of the first diffused device light 711 may bypass the second diffuser arrangement 2710, i.e., may propagate to the light exit via the second diffuser arrangement 2710. In such embodiments, the light generating system 1000 may thus be configured to provide, in an operational mode of the light generating system 1000, via the light exit 1090, system light 1001 further comprising at least part of the first diffused device light 711.

[0241] Further, in embodiments, the light generating system 1000 may comprise a control system 300. Moreover, in embodiments, the light generating system 1000 may comprise a polarization control system 600. Further, in embodiments, both the first redirection optical element 510 and the second redirection optical element 520 may comprise a polarizing beam splitter. The polarization control system 600 may especially be configured to one or more of (i) control rotation of the second redirection optical element 520 relative to an optical axis (O) of incoming first diffused device light 711 on the second redirection optical element 520, and (ii) change a polarization direction of the first diffused device light 711 on the second redirection optical element 520.

[0242] Therefore, in embodiments, the polarization control system 600 may comprise a system X / 2 waveplate 610. The system X / 2 waveplate 610 may especially be configured in2024PF80318

[0243] 45

[0244] an optical path between the first redirection optical element 510 and the second redirection optical element 520. In embodiments, the system X / 2 waveplate 610 may be configured to convert (first) linear polarized light into elliptical polarized light or into (second) linear polarized light having a different (relative to the first linear polarization) polarization direction. For example, as depicted in Fig. 2B, the system X / 2 waveplate 610 may be configured to convert first diffused device light 711 received by the system X / 2 waveplate 610 and having a first linear polarization (here especially s-polarization), into first diffused device light 711 having an elliptical polarization (here especially comprising both p-polarization and s-polarization), different from the first linear polarization. As depicted here, the s-polarized first diffused device light 711 may propagate in an optical path to the light exit 1090, whereas the p-polarized first diffused device light 711 may be rediffused by the second diffuser arrangement 2700 into second diffused device light 2711, which may propagate in an optical path to the light exit 1090. Hence, in such embodiments, the system light 1001 may comprise both the first diffused device light 711 and the second diffused device light 2711.

[0245] Alternatively, in embodiments (not depicted), the system X / 2 waveplate 610 may be configured to convert first diffused device light 711 received by the system X / 2 waveplate 610 and having a first linear polarization (for example s-polarization), into first diffused device light 711 having a second linear polarization (for example p-polarization), different from the first linear polarization. As such, in embodiments, the first diffused device light 711 having the second linear polarization may propagate in an optical path to the second diffuser arrangement 2700, where it may be rediffused into second diffused device light 2711, which may propagate in an optical path to the light exit 1090. Hence, in such embodiments, the system light 1001 may comprise (only) the second diffused device light 2711.

[0246] The polarization control system 600 may further comprise another X / 2 waveplate 620, configured in an optical path between the second redirection optical element 520 and the light exit 1090. In embodiments, this X / 2 waveplate 620 may be configured (i) to convert linear polarized light having the first linear polarization into linear polarized light having the second linear polarization, and (ii) to convert linear polarized light having the second linear polarization into linear polarized light having the first linear polarization.

[0247] In embodiments, the third redirection optical element 530 may comprise a polarizing beam splitter. In embodiments, the third redirection optical element 530 may be configured in an optical path between the system X / 2 waveplate 610 and the light exit 1090.2024PF80318

[0248] 46

[0249] Further, in some embodiments, the third redirection optical element 530 may thus be configured in an optical path between the system X / 2 waveplate 610 and the second redirection optical element 520. In embodiments, the third redirection optical element 530 may especially be configured to (a) transmit first diffused device light 711 received by the third redirection optical element 530 (from the first redirection optical element 510 via the system X / 2 waveplate 610) and having one of the first linear polarization and the second linear polarization (here especially p-polarization) in an optical path to the second redirection optical element 520 and (b) reflect first diffused device light 711 received by the third redirection optical element 530 (from the first redirection optical element 510 via the system X / 2 waveplate 610) and having the other one of the first linear polarization and the second linear polarization (here especially s-polarization) in an optical path to the light exit 1090 (without propagating via the second diffuser arrangement 2700, i.e., bypassing the second diffuser arrangement 2700).

[0250] Alternatively, in embodiments (not depicted), the third redirection optical element 530 may especially be configured to (a) reflect first diffused device light 711 received by the third redirection optical element 530 (from the first redirection optical element 510 via the system X / 2 waveplate 610) and having one of the first linear polarization and the second linear polarization in an optical path to the second redirection optical element 520 and (b) transmit first diffused device light 711 received by the third redirection optical element 530 (from the first redirection optical element 510 via the system X / 2 waveplate 610) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit 1090 (without propagating via the second diffuser arrangement 2700, i.e., bypassing the second diffuser arrangement 2700).

[0251] Furthermore, in embodiments, the polarization control system 600 may be configured to control the system X / 2 waveplate such that x% of the first diffused device light 711 received by the system X / 2 waveplate from the first redirection optical element 510 may be provided in an optical path to the second diffuser arrangement 2700. In such embodiments, the polarization control system 600 may further be configured to control the system X / 2 waveplate such that 100-x% of the first diffused device light 711 received by the system X / 2 waveplate from the first redirection optical element 510 bypasses the second diffuser arrangement 2700. In embodiments, x may be selected from the range of 30-90%.

[0252] Fig. 3 schematically depicts an embodiment of the light generating system 1000. As depicted here, the light generating system 1000 may comprise a first lighting arrangement 1100 comprising the first light generating device 110, the first diffuser2024PF80318

[0253] 47

[0254] arrangement 700, the second diffuser arrangement 2700, and the one or more first optical elements 1500. The first lighting arrangement 1100 may especially comprise a primary subarrangement 1110 comprising the first light generating device 110, the first diffuser arrangement 700, the second diffuser arrangement 2700, and the one or more first optical elements 1500. Further, in embodiments, the first lighting arrangement 1100 (of the light generating system 1000) may comprise a secondary sub-arrangement 1120.

[0255] In embodiments, the secondary sub-arrangement 1120 may comprise a second light generating device 120, a secondary first diffuser arrangement 702, a secondary second diffuser arrangement 2702, and second redirection optical elements 2500.

[0256] In embodiments, the second light generating device 120 may comprise a solid-state light source selected from the group of laser diodes, superluminescent diodes, and multi -junction diodes. Especially, the second light generating device 120 may be configured to provide second device light 121. In specific embodiments, the second light generating device 120 may comprise a second laser bank comprising a plurality of second lasers 20.

[0257] Further, in embodiments, the secondary first diffuser arrangement 702 may comprise a secondary first diffuser 712 and a secondary first X / 4 waveplate 722. In embodiments, the secondary first diffuser 712 may be configured in the reflective mode. Furthermore, in embodiments, the secondary diffuser arrangement 702 may be configured to convert at least part of the second device light 121 received by the secondary diffuser arrangement 702 and having the second linear polarization into secondary first diffused device light 721 having the first linear polarization.

[0258] Yet further, in embodiments, the secondary second diffuser arrangement 2702 may comprise a secondary second diffuser 2712 and a secondary second X / 4 waveplate 2722. Especially, the secondary second diffuser 2712 may be configured in the reflective mode. In further embodiments, the secondary second diffuser arrangement 2702 may be configured to convert at least part of the secondary first diffused device light 721 received by the secondary second diffuser arrangement 2702 and having one of the first linear polarization and the second linear polarization into secondary second diffused device light 2721 having the other one of the first linear polarization and the second linear polarization.

[0259] Further, in embodiments, the second redirection optical elements 2500 may comprise at least a secondary first redirection optical element 512. In embodiments, the secondary first redirection optical element 512 may be configured in an optical path between the second light generating device 121 and the secondary first diffuser arrangement 702. Additionally, in embodiments, the secondary first redirection optical element 512 may be2024PF80318

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[0261] configured in an optical path between the secondary first diffuser arrangement 702 and the secondary second diffuser arrangement 2702. Yet additionally, in embodiments, the secondary first redirection optical element 512 may be configured in an optical path between the secondary second diffuser arrangement 2702 and the light exit 1090.

[0262] The secondary first redirection optical element 512 may further, in embodiments (not depicted), be configured to (i) transmit the second device light 121 received by the secondary first redirection optical element 512 in an optical path to the secondary first diffuser arrangement 702 and (ii) reflect the secondary first diffused device light 721 received by the secondary first redirection optical element 512 in an optical path to the secondary second diffuser arrangement 2702. Alternatively, in embodiments as depicted in Fig. 3, the secondary first redirection optical element 512 may be configured to (i) reflect the second device light 121 received by the secondary first redirection optical element 512 in an optical path to the secondary first diffuser arrangement 702 and (ii) transmit the secondary first diffused device light 721 received by the secondary first redirection optical element 512 in an optical path to the secondary second diffuser arrangement 2702.

[0263] Moreover, in embodiments (not depicted), the second redirection optical elements 2500 may be configured to (i) reflect the secondary first diffused device light 721 received from the secondary first diffuser arrangement 702 and having one of the first linear polarization and the second linear polarization in an optical path to the secondary second diffuser arrangement 2702 and (ii) transmit the secondary second diffused device light 2721 received from the secondary second diffuser arrangement 2702 and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit 1090. Alternatively, in embodiments as depicted in Fig. 3, the second redirection optical elements 2500 may be configured to (i) transmit the secondary first diffused device light 721 received from the secondary first diffuser arrangement 702 and having one of the first linear polarization and the second linear polarization in an optical path to the secondary second diffuser arrangement 2702 and (ii) reflect the secondary second diffused device light 2721 received from the secondary second diffuser arrangement 2702 and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit 1090.

[0264] Further, in embodiments, the light generating system 1000 (especially the optics 500) may comprise a first beam combiner 505. In embodiments, the first beam combiner 505 may be configured downstream of both the primary sub-arrangement 1110 and the secondary sub-arrangement 1120. The first beam combiner 505 may especially be2024PF80318

[0265] 49

[0266] configured to combine (i) the second diffused device light 2711 received by the first beam combiner 505 from the primary sub-arrangement 1110 and (ii) the secondary second diffused device light 2721 received by the first beam combiner 505 from the secondary subarrangement 1120 in the same optical path to the light exit 1090. In embodiments, the first beam combiner 505 may especially do so by reflecting one of the second diffused device light 2711 and the secondary second diffused device light 2721 and transmitting the other one of the second diffused device light 2711 and the secondary second diffused device light 2721 in dependence of their respective linear polarizations.

[0267] As such, in embodiments, the light generating system 1000 may be configured to provide, in an operational mode of the light generating system 1000, via the light exit 1090, system light 1001 comprising at least part of the secondary second diffused device light 2721. Moreover, in embodiments, the system light 1001 (comprising at least part of both the second diffused device light 2711 and the secondary second diffused device light 2721) may be unpolarized light (or polarized light comprising multiple (linear) polarizations, especially both p- and s-polarization).

[0268] Fig. 4 schematically depicts an embodiment of the light generating system 1000 comprising the first lighting arrangement 1100, which comprises (at least) the primary sub-arrangement 1110 (and optionally the secondary sub-arrangement 1120). As such, in embodiments, first lighting arrangement 1100 may be configured to generate first arrangement light 1101 having a first wavelength (XI) selected from the wavelength range of 440-490 nm. Hence, the second lighting arrangement 1200 may be configured to provide blue light. In embodiments, the system light 1001 may comprise at least part of the first arrangement light 1101.

[0269] Furthermore, in embodiments as depicted in Fig. 4, the light generating system 1000 may further comprise a second lighting arrangement 1200 comprising the primary subarrangement 1110 and optionally the secondary sub-arrangement 1120. In such embodiments, the second lighting arrangement 1200 may be configured to generate second arrangement light 1201 having a second wavelength (X2) selected from the wavelength range of 500-590 nm. Hence, the second lighting arrangement 1200 may be configured to provide green light. In embodiments, the system light 1001 may further comprise at least part of the second arrangement light 1201. Therefore, in embodiments such as depicted here, the optics 500 may further comprise a second beam combiner 515. In embodiments, the second beam combiner 515 may be configured to combine the first arrangement light 1101 and the second arrangement light 1201 into the same optical path to the light exit 1090. The second beam2024PF80318

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[0271] combiner 515 may especially do so in dependence of the spectral power distributions of the different types of light, i.e., the second beam combiner 515 may comprise a spectral beam combiner.

[0272] Furthermore, in embodiments as depicted in Fig. 4, the light generating system 1000 may further comprise a third lighting arrangement 1300 comprising the primary subarrangement 1110 (and optionally the secondary sub-arrangement 1120). In such embodiments, third lighting arrangement 1300 may be configured to generate third arrangement light 1301 having a third wavelength (X3) selected from the wavelength range of 600-690 nm. Hence, the third lighting arrangement 1300 may be configured to provide red light. In embodiments, in embodiments, the system light 1001 may further comprise at least part of the third arrangement light 1301. Therefore, in embodiments such as depicted here, the optics 500 may further comprise a third beam combiner 525. In embodiments, the third beam combiner 525 may be configured to combine the first arrangement light 1101, the second arrangement light 1201, and the third arrangement light 1301 into the same optical path to the light exit 1090. The third beam combiner 525 may especially do so in dependence of the spectral power distributions of the different types of light, i.e., the third beam combiner 525 may comprise a spectral beam combiner.

[0273] Fig. 5 schematically depicts yet another embodiment of the light generating system 1000. As depicted here, in embodiments, the light generating system 1000 may further comprise a third light generating device 130, a multichroic beam combiner 590, and a luminescent material 200.

[0274] In embodiments, the third light generating device 130 may comprise a solid-state light source selected from the group of diode lasers, superluminescent diodes, and multi -junction diodes. Especially, the third light generating device 130 may be configured to provide third device light 131. In specific embodiments, the third light generating device 130 may comprise a third laser bank comprising a plurality of third lasers 30.

[0275] Further, in embodiments, the luminescent material 200 may be configured in a light-receiving relationship with the third light generating device 130. As such, in embodiments, the luminescent material 200 may be configured to convert at least part of the third device light 131 received by the luminescent material 200 into luminescent material light 201.

[0276] The multichroic beam combiner 590 may, in embodiments, be configured in an optical path between the third light generating device 130 and the luminescent material 200. In embodiments, the multichroic beam combiner 590 may be configured to transmit or2024PF80318

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[0278] reflect the third device light 130 received by the multichroic beam combiner 590 from the third light generating device 130 in an optical path to the luminescent material 200.

[0279] Additionally, in embodiments where the luminescent material 200 may be configured in the reflective mode, the multichroic beam combiner 590 may be configured in an optical path between the luminescent material 200 and the light exit 1090. In such embodiments, the multichroic beam combiner 590 may be configured to reflect or transmit the luminescent material light 201 received by the multichroic beam combiner 590 from the luminescent material 200 in an optical path to the light exit 1090. Hence, in embodiments, the light generating system 1000 may be configured to provide, in an operational mode of the light generating system 1000, via the light exit 1090, system light 1001 comprising at least part of the luminescent material light 201.

[0280] Fig. 6 schematically depicts an embodiment of a luminaire 2 comprising the light generating system 1000 as described above. Reference 301 indicates a user interface which may be functionally coupled with the control system 300 comprised by or functionally coupled to the light generating system 1000. Fig. 6 also schematically depicts an embodiment of lamp 1 comprising the light generating system 1000. Reference 3 indicates a projector device or projector system, which may be used to project images, such as at a wall, which may also comprise the light generating system 1000. Hence, Fig. 6 schematically depicts embodiments of a lighting device 1200 selected from the group of a lamp 1, a luminaire 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising the light generating system 1000 as described herein. In embodiments, such lighting device may be a lamp 1, a luminaire 2, a projector device 3, a disinfection device, or an optical wireless communication device. Lighting device light escaping from the lighting device 1200 is indicated with reference 1201. Lighting device light 1201 may essentially consist of system light 1001, and may in specific embodiments thus be system light 1001. Reference 1300 refers to a space, such as a room. Reference 1305 refers to a floor, reference 1310 to a ceiling, and reference 1307 to a wall. Fig. 6 also schematically depicts an embodiment of an outdoor light, or stage light, or stadium light. Fig.

[0281] 6 also schematically depicts a vehicle, like an automobile, but this may also be a truck, a motor cycle, etc. etc., with automotive lighting 4, e.g. headlights. These automotive lighting 4 may also comprise the lighting device 1200. Another embodiment of a lamp may be a torch.

[0282] The term “plurality” refers to two or more.

[0283] The terms “substantially” or “essentially” herein, and similar terms, will be understood by the person skilled in the art. The terms “substantially” or “essentially” may2024PF80318

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[0285] also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially or essentially may also be removed. Where applicable, the term “substantially” or the term “essentially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, even more especially 99.5% or higher, including 100%.

[0286] The term “comprise” also includes embodiments wherein the term “comprises” means “consists of’.

[0287] The term “and / or” especially relates to one or more of the items mentioned before and after “and / or”. For instance, a phrase “item 1 and / or item 2” and similar phrases may relate to one or more of item 1 and item 2. The term "comprising" may in an embodiment refer to "consisting of' but may in another embodiment also refer to "containing at least the defined species and optionally one or more other species".

[0288] Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

[0289] The devices, apparatus, or systems may herein amongst others be described during operation. As will be clear to the person skilled in the art, the invention is not limited to methods of operation, or devices, apparatus, or systems in operation.

[0290] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims.

[0291] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0292] Use of the verb "to comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. Unless the context clearly requires otherwise, throughout the description and the claims, the words “comprise”, “comprising”, and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of “including, but not limited to”.

[0293] The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0294] The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a device claim, or an2024PF80318

[0295] 53

[0296] apparatus claim, or a system claim, enumerating several means, several of these means may be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. In yet a further aspect, the invention (thus) provides a software product, which, when running on a computer is capable of bringing about (one or more embodiments of) the method as described herein.

[0297] The invention also provides a control system that may control the device, apparatus, or system, or that may execute the herein described method or process. Yet further, the invention also provides a computer program product, when running on a computer which is functionally coupled to or comprised by the device, apparatus, or system, controls one or more controllable elements of such device, apparatus, or system.

[0298] The invention further applies to a device, apparatus, or system comprising one or more of the characterizing features described in the description and / or shown in the attached drawings. The invention further pertains to a method or process comprising one or more of the characterizing features described in the description and / or shown in the attached drawings.

[0299] The various aspects discussed in this patent can be combined in order to provide additional advantages. Further, the person skilled in the art will understand that embodiments can be combined, and that also more than two embodiments can be combined. Furthermore, some of the features can form the basis for one or more divisional applications.

Claims

2024PF8031854CLAIMS:

1. A light generating system (1000) comprising a primary sub-arrangement (1110) and a light exit (1090), wherein the primary sub-arrangement (1110) comprises:a first light generating device (110) comprising a solid-state light source selected from the group of laser diodes, superluminescent diodes, and multi -junction diodes; wherein the first light generating device (110) is configured to provide first device light (in);a first diffuser arrangement (700) comprising a first diffuser (710) and a first X / 4 waveplate (720), wherein the first diffuser (710) is configured in the reflective mode, wherein the diffuser arrangement (700) is configured to convert at least part of the first device light (111) received by the diffuser arrangement (700) and having a first linear polarization into first diffused device light (711) and having a second linear polarization, different from the first linear polarization;a second diffuser arrangement (2700) comprising a second diffuser (2710) and a second X / 4 waveplate (2720), wherein the second diffuser (2710) is configured in the reflective mode, wherein the second diffuser arrangement (2700) is configured to convert at least part of the first diffused device light (711) received by the second diffuser arrangement (2700) and having one of the first linear polarization and the second linear polarization into second diffused device light (2711), with the second diffused device light (2711) having the other one of the first linear polarization and the second linear polarization;one or more first optical elements (1500) comprising at least a first redirection optical element (510), wherein the first redirection optical element (510) is configured (i) in an optical path between the first light generating device (111) and the first diffuser arrangement (700) and (ii) in an optical path between the first diffuser arrangement (700) and the second diffuser arrangement (2700), wherein the first redirection optical element (510) is configured to (i) transmit the first device light (111) received by the first redirection optical element (510) and having the first linear polarization in an optical path to the first diffuser arrangement (700) and reflect the first diffused device light (711) received by the first redirection optical element (510) and having the second linear polarization in an optical path to the second diffuser arrangement (2700), or (ii) reflect the first device light (111) received2024PF8031855by the first redirection optical element (510) and having the first linear polarization in an optical path to the first diffuser arrangement (700) and transmit the first diffused device light (711) received by the first redirection optical element (510) and having the second linear polarization in an optical path to the second diffuser arrangement (2700); wherein the one or more first optical elements (1500) are configured to (i) reflect the first diffused device light (711) received from the first diffuser arrangement (700) and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement (2700) and transmit the second diffused device light (2711) received from the second diffuser arrangement (2700) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090), or (ii) transmit the first diffused device light (711) received from the first diffuser arrangement (700) and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement (2700) and reflect the second diffused device light (2711) received from the second diffuser arrangement (2700) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090); andthe light generating system (1000) is configured to provide, in an operational mode of the light generating system (1000), via the light exit (1090), system light (1001) comprising at least part of the second diffused device light (2711).

2. The light generating system (1000) according to claim 1, wherein the one or more first optical elements (1500) further comprise a second redirection optical element (520), wherein the second redirection optical element (520) is configured (i) in an optical path between the first diffuser arrangement (700) and the second diffuser arrangement (2700) and (ii) in an optical path between the second diffuser arrangement (2700) and the light exit (1090); wherein the second redirection optical element (520) is configured to (i) reflect the first diffused device light (711) received by the second redirection optical element (520) and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement (2700) and transmit the second diffused device light (2711) received by the second redirection optical element (520) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090), or (ii) transmit the first diffused device light (711) received by the second redirection optical element (520) and having one of the first linear polarization and the second linear polarization in an optical path to the second diffuser arrangement (2700) and2024PF8031856reflect the second diffused device light (2711) received by the second redirection optical element (520) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090).

3. The light generating system (1000) according to claim 2, wherein the light generating system (1000) comprises a polarization control system (600); wherein both the first redirection optical element (510) and the second redirection optical element (520) comprise a polarizing beam splitter, wherein the polarization control system (600) is configured to one or more of (i) control rotation of the second redirection optical element (520) relative to an optical axis (O) of incoming first diffused device light (711) on the second redirection optical element (520), and (ii) change a polarization direction of the first diffused device light (711) on the second redirection optical element (520).

4. The light generating system (1000) according to any one of the preceding claims, wherein:the first diffuser (710) comprises a polarization maintaining diffuser, wherein the first diffuser (710) is configured in a light receiving relationship with the first light generating device (110) via the first redirection optical element (510), wherein the first diffuser (710) is configured to diffuse at least part of the first device light (111) received by the first diffuser (710) into first diffused device light (711);the first X / 4 waveplate (720) is configured in an optical path between the first redirection optical element (510) and the first diffuser (710), wherein the first redirection optical element (510) is configured to direct first device light (111), received by the first redirection optical element (510), to the first X / 4 waveplate (720); wherein the first X / 4 waveplate (720) is configured to direct (i) first device light (111) received by the first X / 4 waveplate (720) from the first redirection optical element (510) to the first diffuser (710), and to direct (ii) first diffused device light (711) received by the first X / 4 waveplate (720) from the first diffuser (710) to the first redirection optical element (510), wherein the first device light (111), received by the first redirection optical element (510) from the first light generating device (110), has the first linear polarization and the first diffused device light (711), received by the first redirection optical element (510) via the first X / 4 waveplate (720), has the second linear polarization;the second diffuser (2710) comprises a polarization maintaining diffuser, wherein the second diffuser (2710) is configured in a light receiving relationship with the2024PF8031857first diffuser arrangement (700) via the first redirection optical element (510), wherein the second diffuser (2710) is configured to diffuse at least part of the first diffused device light (2711) received by the second diffuser (2710) into second diffused device light (2711);the second X / 4 waveplate (2720) is configured in an optical path between the first redirection optical element (510) and the second diffuser (710), wherein the one or more first optical elements (1500) are configured to direct first diffused device light (711), received from the first diffuser arrangement (700), to the second X / 4 waveplate (2720); wherein the second X / 4 waveplate (2720) is configured to direct (i) first diffused device light (711) received by the second X / 4 waveplate (2720) from first diffuser arrangement (700) to the second diffuser (2710), and to direct (ii) second diffused device light (2711) received by the second X / 4 waveplate (2720) from the second diffuser (2710) in an optical path to the light exit (1090).

5. The light generating system (1000) according to any one of the preceding claims 2-3, wherein the light generating system comprises a third redirection optical element (530), and a fourth redirection optical element (540), wherein:the third redirection optical element (530) is configured (i) in an optical path between the first redirection optical element (510) and the light exit (1090), wherein the third redirection optical element (530) is configured to transmit at least part of the first diffused device light (711) received by the third redirection optical element (530) in an optical path to the second redirection optical element (520) and reflect at least another part of the first diffused device light (711) received by the third redirection optical element (530) in an optical path to the light exit (1090);the fourth redirection optical element (540) is configured (i) in an optical path between the third redirection optical element (530) and the light exit (1090) and (ii) in an optical path between the second redirection optical element (520) and the light exit (1090), wherein the fourth redirection optical element (540) is configured to (a) transmit second diffused device light (2711) received by the fourth redirection optical element (540and having one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090) and reflect first diffused device light (711) received by the fourth redirection optical element (540) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090), or (b) reflect second diffused device light (2711) received by the fourth redirection optical element (540) and having one of the first linear polarization and the second linear polarization in an optical path2024PF8031858to the light exit (1090) and transmit first diffused device light (711) received by the fourth redirection optical element (540and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090); andwherein the light generating system (1000) is configured to provide, in an operational mode of the light generating system (1000), via the light exit (1090), system light (1001) further comprising at least part of the first diffused device light (711).

6. The light generating system (1000) according to claim5, wherein:the polarization control system (600) comprises a system X / 2 waveplate (610), configured in an optical path between the first redirection optical element (510) and the second redirection optical element (520), and a X / 2 waveplate (620), configured in an optical path between the second redirection optical element (520) and the light exit (1090); wherein the system X / 2 waveplate (610) is configured to convert linear polarized light into elliptical polarized light or into linear polarized light having a polarization direction;the X / 2 waveplate (620) is configured (i) to convert linear polarized light having the first linear polarization into linear polarized light having the second linear polarization and (ii) to convert linear polarized light having the second linear polarization into linear polarized light having the first linear polarization;the third redirection optical element (530) comprises a polarizing beam splitter configured (i) in an optical path between the system X / 2 waveplate (610) and the light exit (1090) and (ii) in an optical path between the system X / 2 waveplate (610) and the second redirection optical element (520), wherein the third redirection optical element (530) is configured to (a) transmit first diffused device light (711) received by the third redirection optical element (530and having one of the first linear polarization and the second linear polarization in an optical path to the second redirection optical element (520) and reflect first diffused device light (711) received by the third redirection optical element (530) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090), or (b) reflect first diffused device light (711) received by the third redirection optical element (530) and having one of the first linear polarization and the second linear polarization in an optical path to the second redirection optical element (520) and transmit first diffused device light (711) received by the third redirection optical element (530) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090); and2024PF8031859the polarization control system (600) is configured to control the system X / 2 waveplate (610) such that x% of the first diffused device light (711) received by the system X / 2 waveplate (610) from the first redirection optical element (510) is provided in an optical path to the second diffuser arrangement (2700) and 100-x% of the first diffused device light (711) received by the system X / 2 waveplate (610) from the first redirection optical element (510) bypasses the second diffuser arrangement (2700), wherein x is selected from the range of 30-90%.

7. The light generating system (1000) according to any one of the preceding claims, further comprising a secondary sub-arrangement (1120), wherein the secondary subarrangement (1120) comprises:a second light generating device (120) comprising a solid-state light source selected from the group of laser diodes, superluminescent diodes, and multi -junction diodes; wherein the second light generating device (120) is configured to provide second device light (121);a secondary first diffuser arrangement (702) comprising a secondary first diffuser (712) and a secondary first X / 4 waveplate (722), wherein the secondary first diffuser (712) is configured in the reflective mode, wherein the secondary diffuser arrangement (702) is configured to convert at least part of the second device light (121) received by the secondary diffuser arrangement (702) and having the second linear polarization into secondary first diffused device light (721) having the first linear polarization;a secondary second diffuser arrangement (2702) comprising a secondary second diffuser (2712) and a secondary second X / 4 waveplate (2722), wherein the secondary second diffuser (2712) is configured in the reflective mode, wherein the secondary second diffuser arrangement (2702) is configured to convert at least part of the secondary first diffused device light (721) received by the secondary second diffuser arrangement (2702) and having one of the first linear polarization and the second linear polarization into secondary second diffused device light (2721) having the other one of the first linear polarization and the second linear polarization;second redirection optical elements (2500) comprising at least a secondary first redirection optical element (512), wherein the secondary first redirection optical element (512) is configured (i) in an optical path between the second light generating device (121) and the secondary first diffuser arrangement (702), (ii) in an optical path between the secondary first diffuser arrangement (702) and the secondary second diffuser arrangement2024PF8031860(2702), and (iii) in an optical path between the secondary second diffuser arrangement (2702) and the light exit (1090); wherein the secondary first redirection optical element (512) is configured to (i) transmit the second device light (121) received by the secondary first redirection optical element (512) in an optical path to the secondary first diffuser arrangement (702) and reflect the secondary first diffused device light (721) received by the secondary first redirection optical element (512) in an optical path to the secondary second diffuser arrangement (2702), or (ii) reflect the second device light (121) received by the secondary first redirection optical element (512) in an optical path to the secondary first diffuser arrangement (702) and transmit the secondary first diffused device light (721) received by the secondary first redirection optical element (512) in an optical path to the secondary second diffuser arrangement (2702); wherein the second redirection optical elements (2500) are configured to (i) reflect the secondary first diffused device light (721) received from the secondary first diffuser arrangement (702) and having one of the first linear polarization and the second linear polarization in an optical path to the secondary second diffuser arrangement (2702) and transmit the secondary second diffused device light (2721) received from the secondary second diffuser arrangement (2702) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090), or (ii) transmit the secondary first diffused device light (721) received from the secondary first diffuser arrangement (702) and having one of the first linear polarization and the second linear polarization in an optical path to the secondary second diffuser arrangement (2702) and reflect the secondary second diffused device light (2721) received from the secondary second diffuser arrangement (2702) and having the other one of the first linear polarization and the second linear polarization in an optical path to the light exit (1090); - wherein the light generating system (1000) further comprises a first beam combiner (505) configured downstream of both the primary sub-arrangement (1110) and the secondary sub-arrangement (1120), wherein the first beam combiner (505) is configured to combine (i) the second diffused device light (2711) received by the first beam combiner (505) from the primary sub-arrangement (1110) and (ii) the secondary second diffused device light (2721) received by the first beam combiner (505) from the secondary sub-arrangement (1120) in the same optical path to the light exit (1090) by reflecting one of the second diffused device light (2711) and the secondary second diffused device light (2721) and transmitting the other one of the second diffused device light (2711) and the secondary second diffused device light (2721) in dependence of their respective linear polarizations; and2024PF8031861the light generating system (1000) is configured to provide, in an operational mode of the light generating system (1000), via the light exit (1090), system light (1001) comprising at least part of the secondary second diffused device light (2721).

8. The light generating system (1000) according to any one of the preceding claims, wherein the system light (1001) is unpolarized light.

9. The light generating system (1000) according to any one of the preceding claims, wherein the light generating system (1000) comprises a first lighting arrangement (1100) comprising the primary sub-arrangement (1110), wherein the first lighting arrangement (1100) is configured to generate first arrangement light (1101) having a first wavelength ( i) selected from the wavelength range of 440-490 nm; and wherein the system light (1001) comprises at least part of the first arrangement light (1101).

10. The light generating system (1000) according to claim 9, wherein the light generating system (1000) further comprises a second lighting arrangement (1200) comprising a second primary sub-arrangement (1110) and optionally the secondary sub-arrangement (1120), wherein the second lighting arrangement (1200) is configured to generate second arrangement light (1201) having a second wavelength (X2) selected from the wavelength range of 500-590 nm; and wherein the system light (1001) further comprises at least part of the second arrangement light (1201).

11. The light generating system (1000) according to any one of the preceding claims 9-10, wherein the light generating system (1000) further comprises a third lighting arrangement (1300) comprising a third primary sub-arrangement (1110), wherein third lighting arrangement (1300) is configured to generate third arrangement light (1301) having a third wavelength (X3) selected from the wavelength range of 600-690 nm; and wherein the system light (1001) further comprises at least part of the third arrangement light (1301).

12. The light generating system (1000) according to any one of the preceding claims, further comprising a third light generating device (130), a multichroic beam combiner (590), and a luminescent material (200), wherein:the third light generating device (130) comprises a solid-state light source selected from the group of diode lasers, superluminescent diodes, and multi -junction diodes;2024PF8031862wherein the third light generating device (130) is configured to provide third device light (131);the luminescent material (200) is configured in a light-receiving relationship with the third light generating device (130), wherein the luminescent material (200) is configured to convert at least part of the third device light (131) received by the luminescent material (200) into luminescent material light (201);the multichroic beam combiner (590) is configured in an optical path between the third light generating device (130) and the luminescent material (200), wherein the multichroic beam combiner (590) is configured to transmit or reflect the third device light (130) received by the multichroic beam combiner (590) from the third light generating device (130) in an optical path to the luminescent material (200); andthe light generating system (1000) is configured to provide, in an operational mode of the light generating system (1000), via the light exit (1090), system light (1001) comprising at least part of the luminescent material light (201).

13. The light generating system (1000) according to claim 12, wherein the first light generating device (110) comprises a first laser bank comprising a plurality of first lasers (10); and wherein the luminescent element (200) at least comprises a luminescent material of the type AsBsO Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.

14. The light generating system (1000) according to any one of the preceding claimsl0-13, wherein in an operational mode of the light generating system (1000) the system light (1001) is white light having a correlated color temperature selected from the range of 1700-12000 K and a color rendering index of at least 65.

15. A lighting device (1200), selected from the group of a lamp (1), a luminaire (2), a lighting fixture, a projector device (3), and an automotive lighting device, comprising the light generating system (1000) according to any one of the preceding claims 10-14.

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