Stacked laser library with apertures for obtaining high brightness white light sources

Abstract

The invention provides a light generating system (1000) comprising a first support (2100), a first 2D array (2110) of first light sources (10), a first optical element (410), a second support (2200), a second 2D array (2210) of second light sources (20), and a second optical element (420) wherein: (A) the first support (2100) is configured to support the first light sources (10) and the second support (2200) is configured to support the second light sources (20); the first light source (10) is configured to generate first light source light (11) and the second light source (20) is configured to generate second light source light (21); wherein the first light source (10) comprises a laser diode and the second light source (20) comprises a laser diode; wherein the first support (2100) comprises a first thermally conductive element (2160) and / or wherein the second support (2200) comprises a second thermally conductive element (2260); (B) a first optical element (410) arranged downstream of the first light source (10) and configured to collimate the first light source light (11) into a first light beam (15) of collimated first light source light (11); a second optical element (420) arranged downstream of the second light source (20) and configured to collimate the second light source light (21) into a second light beam (25) of collimated second light source light (21); (C) the first support (2100) and the second support (2200) are configured to be stacked, where the second support (2200) comprises an array (2220) of through holes (2250) configured to align with the first optical element (410) to allow at least a portion of the collimated first source light (11) to propagate through the second support (2200); (D) The light generating system (1000) is configured to generate system light (1001) comprising one or more of the first light source light (11) and the second light source light (21).

Description

Technical Field

[0001] The present invention relates to a light generation system, which includes first and second supports, first and second 2D arrays of first and second light sources, and first and second optical elements. The present invention also relates to a lighting device including the light generation system. Background Art

[0002] Light generation systems including optical devices are known in the art. For example, WO2022073895A1 describes a light generation system, which includes a light generation device, a light emitter, and a first optical device, wherein: the light generation device is configured to generate device light; wherein the light generation device includes a laser; the light emitter includes a luminescent material, wherein the luminescent material is configured to convert at least a part of the device light into luminescent material light, and wherein the light emitter is transmissive to at least a part of the luminescent material light; the first optical device is transmissive to at least a part of the device light and reflective to at least a part of the luminescent material light, wherein the first optical device includes a main optical device surface having a first surface area A1, wherein the main optical device surface is configured to be in a light receiving relationship with the light generation device; the light emitter is enclosed by a cavity having a cavity opening, the cavity opening having a minimum cross-sectional area A2, wherein the cavity is at least partially defined by an optical device; wherein the first optical device includes the cavity opening; wherein A2 < A1; and the cavity is reflective to the luminescent material light, and the luminescent material light substantially only exits the cavity via the cavity opening. Summary of the Invention

[0003] Applications such as stage lighting, stadium lighting, transportation infrastructure, etc. may require the use of high-intensity white light. Laser lighting can be used for high-brightness white light illumination applications. Recent developments have shown that instead of individual lasers, a laser library can be used for laser lighting. A laser library is an array of aligned laser diodes arranged on a carrier, wherein the laser is collimated by a lens plate including a microlens array. It is desirable to (further) improve the performance and / or functionality of laser lighting through a laser library. However, current applications may not allow for a compact high-intensity system.

[0004] Therefore, one aspect of the present invention is to provide a light generation system, which preferably further at least partially eliminates one or more of the above-mentioned drawbacks. The object of the present invention is to overcome or improve at least one drawback of the prior art, or to provide a useful alternative.

[0005] According to a first aspect, the present invention provides a light generating system. In an embodiment, the light generating system may include, in particular, a first support, a first 2D array of first light sources, and a first optical element. Furthermore, the light generating system may include a second support, a second 2D array of second light sources, and a second optical element. In an embodiment, the first support may be configured to support the first light source. Furthermore, the second support may be configured to support the second light source. The first light source may be configured to generate first light source light. The second light source may also be configured to generate second light source light. In particular, the first light source may include a laser diode. In addition, the second light source may also include a laser diode. The first support may include a first thermal conductive element. Additionally or alternatively, the second support may include a second thermal conductive element. In an embodiment, the first optical element may be configured downstream of the first light source. Furthermore, the first optical element may be configured to collimate the first light source light into a collimated first beam of the first light source light. Furthermore, the second optical element may be configured downstream of the second light source. In particular, the second optical element may be configured to collimate the second light source light into a collimated second beam of the second light source light. In an embodiment, the first support and the second support may be configured to be stacked. The second support may comprise an array of through holes, in particular an array of openings of through holes. These through holes may be specifically configured to be aligned with the first optical element. Thus, the through holes may allow at least a portion of the collimated first light source light to propagate through the second support. In an embodiment, the light generating system may be configured to generate system light. The system light may in particular comprise one or more of the first light source light and the second light source light. Therefore, in an embodiment, the present invention provides a light generating system comprising a first support, a first 2D array of first light sources, a first optical element, a second support, a second 2D array of second light sources and a second optical element, wherein: the first support is configured to support the first light source, and the second support is configured to support the second light source; the first light source is configured to generate the first light source light and the second light source is configured to generate the second light source light; wherein the first light source comprises a laser diode, and the second light source comprises a laser diode; wherein the first support comprises a first heat conducting element and / or wherein the second support comprises a second heat conducting element; the first An optical element is configured downstream of the first light source and is configured to collimate the first light source light into a first beam of collimated first light source light; a second optical element is configured downstream of the second light source and is configured to collimate the second light source light into a second beam of collimated second light source light; the first support and the second support are configured to be stacked, wherein the second support includes an array of through holes configured to be aligned with the first optical element to allow at least a portion of the collimated first light source light to propagate through the second support; and the light generating system is configured to generate system light including one or more of the first light source light and the second light source light.

[0006] The present invention can provide a laser-based (or laser bank-based) system for generating high-intensity white light. In particular, the present invention can further improve the functionality of laser-based (e.g., laser bank-based) light generation systems by using two (or more) stacked laser devices (e.g., stacked laser banks). When the lasers provide (extremely) collimated light with high intensity, the light generated by a first laser device (e.g., a laser bank) can, in embodiments, pass through a through-hole in a second laser device (e.g., a laser bank). Thus, the system light can include light from both laser devices (e.g., laser banks). Consequently, in embodiments, the system light can have improved brightness and / or intensity. In this way, in embodiments, the present invention can provide a stacked laser bank with holes for achieving a high-brightness white light source for use in, for example, stage lighting fixtures, stage stadium lighting, or transportation infrastructure lighting. The present invention is further described with respect to a laser bank comprising laser bars and (diode) laser arrays, but the invention can also be applied to other laser devices.

[0007] As described above, the present invention provides, inter alia, a light generation system that, in embodiments, includes at least two stacked laser devices (or "laser array devices"). The first laser device may, inter alia, include a first support, a first 2D array of first light sources, and a first optical element. In embodiments, the second laser device may include a second support, a second 2D array of second light sources, and a second optical element. Embodiments of these elements are described in more detail below.

[0008] In an embodiment, the light generating system may comprise a first support and a second support. In an embodiment, the support may comprise a material with high thermal conductivity. The laser rod may be placed directly on such a support with high thermal conductivity, or the sealed laser may be placed in an opening in the support with high thermal conductivity. In an embodiment, the support may comprise one or more structural elements, in particular a plate. In some embodiments, the support may comprise a printed circuit board ("PCB"). However, in an embodiment, the support may comprise a main support and another structural element, such as a PCB, which may be functionally coupled to the main support. In an embodiment, the carrier may comprise a metal, such as aluminum and / or copper and alloys thereof.

[0009] In particular, the support may be a structure to which other components may be coupled or arranged. In particular, the support may be configured to support a light source. Furthermore, in embodiments, the light generating system may include one or more light sources functionally coupled to the support. Thus, the support may, in particular, include features for accommodating such light sources. For example, the support may include a port for connecting to the light source. In particular, the light source may include electrodes or nodes that may be functionally coupled to the support. Here, functional coupling may refer to securing the light source to the support such that the electrical component is fixed in place, with substantially no relative movement between the support and the light source. In embodiments, the light source may be electrically coupled to the support. That is, the light source may, in particular, be connected to (other) electrical components via the support. Thus, alternatively or additionally, functional coupling may refer to electrical contact between the light source and one or more conductive tracks included in the support. Here, each of the first and second supports may support a group of light sources. Thus, the first support may be configured to support a first light source, and the second support may be configured to support a second light source.

[0010] Furthermore, the support may include elements for heat management. The support may include, in particular, a heat-conducting element for heat management. The heat-conducting element may transfer heat from the hotter element to the cooler element and / or to the air. To this end, the heat-conducting element, in particular the heat-conducting sheet-like element, may have a thermal conductivity. The heat-conducting element may in particular have a thermal conductivity of at least approximately 0.5 W / (m K), more particularly at least about 1 W / (m K), such as at least about 2W / (m K), for example at least about 5W / (m K), such as in particular at least about 10 W / (m However, lower thermal conductivities can also be used to transfer heat away (e.g. from electrical components). Thermally conductive elements can have thermal conductivity up to 500 W / (m K), for example up to 300W / (m In particular, however, the thermally conductive element may have a thermal conductivity of at least about 100 W / (m K), for example at least about 200 W / (m K). Thus, the thermally conductive element can be an effective heat conductor (away from heat-sensitive or heat-generating components, such as the light source). This can improve the lifespan / performance of the light-generating system. Therefore, the first support member can include a first thermally conductive element. Additionally or alternatively, the second support member can include a second thermally conductive element. In embodiments, the first and second thermally conductive elements can each be selected from the group consisting of a heat sink, a heat spreader, and a two-phase cooling device.

[0011] Thus, the heat-conducting element may comprise a heat sink. Heat sinks are known in the art. The term "heat sink" may particularly refer to a passive heat exchanger that transfers heat generated by a device, such as an electronic or mechanical device, to a fluid (cooling) medium (typically air or a liquid coolant). Thus, the heat is (at least partially) dissipated from the device. A heat sink is particularly designed to maximize its surface area in contact with the surrounding fluid cooling medium. Thus, in particular, a heat sink may comprise multiple fins. For example, a heat sink may be a body having multiple fins extending therefrom. A heat sink may particularly comprise (more particularly consist of) a thermally conductive material. The term "heat sink" may also refer to multiple (different) heat sinks.

[0012] Furthermore, the heat conducting element may comprise a heat spreader. The heat spreader may be configured to transfer energy as heat from the first element to the second element. The second element may in particular be a radiator or a heat exchanger. The heat spreader may be passive or active. An embodiment of a passive heat spreader may comprise a plate or block of material with high thermal conductivity, such as copper, aluminum or diamond. An active heat spreader may be configured to accelerate heat transfer by consuming energy supplied by an external source as work. Here, the heat spreader may in particular be a passive heat spreader. Alternatively or additionally, the heat spreader may be an active heat spreader, such as one selected from the group consisting of a heat pipe and a vapor chamber. The heat spreader in particular comprises (more in particular consists of) a heat conducting material. The term "heat spreader" may also refer to a plurality of (different) heat spreaders.

[0013] Furthermore, the heat transfer element may include a two-phase cooling device. A two-phase cooling device is a device that transfers heat between two locations based on thermal conductivity and phase change. Specifically, a liquid such as water (for example, for copper devices) or acetone (for example, for aluminum devices) can be added to the two-phase cooling device, and the two-phase cooling device can be vacuum-sealed. When heat is applied to one area of ​​the two-phase cooling device, the liquid can transform into vapor and move to a lower pressure area, where it cools and returns to liquid form, where it then moves back to the heat source.

[0014] In an embodiment, the two-phase cooling device may comprise, in particular, a heat pipe or a vapor chamber element. Vapor chamber elements and heat pipes are known in the art and may be based on essentially the same principle. A difference between a heat pipe and a vapor chamber element may be that a heat pipe typically has an essentially rod-like shape, whereas a vapor chamber element typically has a planar shape. In particular, a vapor chamber element may comprise two essentially flat plates at a relatively short distance (e.g., up to 5 mm). Furthermore, with a vapor chamber element, the hot spot can be selected relatively freely, whereas with a heat pipe, there are typically hot and cold sides on opposite sides of a rod, such as at the bottom of a cylindrical heat pipe.

[0015] The two-phase cooling device may have a device wall, in particular, wherein the device wall defines an elongated chamber. In particular, the device wall may enclose the chamber. The device wall may generally be airtight. In particular, the device wall may comprise a thermally conductive material. A two-phase cooling device configured for functional coupling to a light emitter may particularly have a device wall comprising a thermally conductive material selected from the group consisting of copper, aluminum, stainless steel, nickel, and titanium, which may be particularly well-suited for the operating temperatures of such a system.

[0016] Heat pipes and vapor chambers are both two-phase devices used as thermal management solutions. Heat pipes can be devices with high thermal conductivity, capable of transferring large amounts of heat even with a slight temperature difference between their hot and cold ends. Vapor chambers, on the other hand, can be composed of flat heat pipes with very high thermal conductivity, with flat surfaces on both the top and bottom sides. Compared to traditional solutions such as copper heat spreaders, heat pipes and vapor chambers offer many advantages. First, they have higher thermal conductivity. Second, the density of heat pipes and vapor chambers is much lower than that of copper. Due to their hollow structure, heat spreaders made from vapor chambers are much lighter than those made from copper. These properties make them ideal thermal management solutions. Heat pipes offer advantages in terms of high conductivity and design flexibility. Vapor chambers offer advantages in terms of high conductivity, the ability to transfer large amounts of heat, the ability to be made very thin, and the ability to maintain effective heat transfer even when the heat source is high. Their flat structure allows for instantaneous heat dissipation even over large areas. Both devices offer excellent heat dissipation efficiency. While heat pipes remove heat from a heat source, vapor chambers distribute it. Heat pipes can be bent and mounted in all directions. This provides design flexibility and enables them to be used individually, in combination, and in different locations. Vapor chambers can also be curved. Vapor chambers can be planar, which affects the degrees of freedom with which they can be bent.

[0017] In this regard, in embodiments, the second heat-conducting element, in particular the two-phase cooling device, can be arranged in a portion of the second support member remote from the array of through-holes in the second support member, for example, a heat pipe extending between the array of through-holes. Furthermore, in such embodiments, the two-phase cooling device can be particularly curved around the through-holes. In other embodiments, the second heat-conducting element can be designed to include an array of openings aligned with the array of through-holes in the second support member. As will be clear to a person skilled in the art, the two-phase cooling device is closed, and the through-holes are not in fluid communication with the interior of the two-phase cooling device.

[0018] Furthermore, in embodiments, the first heat-conducting element, in particular a two-phase cooling device, can be arranged in a portion of the first support remote from the light sources, for example, a heat pipe extending between the light source array (for example, in a sealed laser configuration). Furthermore, in such embodiments, the two-phase cooling device can be particularly curved around the light source array. In other embodiments, the first heat-conducting element can be designed to include an array of openings for the light sources (for example, in a sealed laser configuration). In further embodiments, the first heat-conducting element can be arranged on the bottom side of the first support, for example, a heat spreader, a heat sink, and a blower fan can be arranged on the bottom side of the first support including the (diode) laser.

[0019] Therefore, the first support member can have a support function for the first light source and a thermal function. To this end, the first light source can be arranged on the first heat-conducting element or at least partially arranged in the first heat-conducting element. Similarly, the second support member can have a support function for the second light source and a thermal function. To this end, the second light source can be arranged on the second heat-conducting element or at least partially arranged in the second heat-conducting element. However, the second support member can also have the function of providing a through hole.

[0020] Thus, each support may comprise a heat conductor, a heat sink, a heat spreader or a (other) two-phase cooling device.Furthermore, the (respective) light source may be at least partially arranged in or on the respective support.

[0021] Other elements known to those skilled in the art may also be arranged on the support, connected to the support or supported by the support, or comprised by the support. For example, the light source may in particular be connected to the power supply via the support. In some embodiments, the power supply may be arranged on the support. Alternatively, however, in embodiments, the power supply may also be arranged outside the support. Thus, in embodiments, the support may comprise a metal core printed circuit board (which itself may be a heat conducting element). In other embodiments, the support may comprise a printed circuit board thermally coupled to the heat conducting element. In other embodiments, the support may comprise a metal core printed circuit board thermally coupled to the heat conducting element.

[0022] In (other) embodiments, the light source may be at least partially embedded in the thermally conductive element.

[0023] In an embodiment, a light generating system may include a first light source and a second light source. The first light source may be arranged on a first support, and the second light source may be arranged on a second support. Specifically, each group of light sources may be arranged in a 2D array (or "matrix"). In an embodiment, the 2D array may be a rectangular array, a square array, a circular array, etc. Thus, the light generating system may include a first 2D array of first light sources and a second 2D array of second light sources.

[0024] In embodiments, a light generating system may include a light source. The light source may specifically be a first light source or a second light source. The light source may also be configured to generate light. Thus, the first light source may be configured to generate first light source light, and the second light source may be configured to generate second light source light. The light source may specifically be a laser diode (or "diode laser"). In embodiments, the term "light source" may refer to a vertical cavity laser diode (VCSEL), an edge-emitting laser, or the like.

[0025] The term "light source" may also refer to multiple light sources, such as a 2-2000 (laser diode) light source. The phrases "different light sources" or "multiple different light sources," and similar phrases, may, in embodiments, refer to multiple solid-state light sources selected from at least two different bins. Similarly, the phrases "the same light source" or "multiple identical light sources," and similar phrases, may, in embodiments, refer to multiple solid-state light sources selected from the same bin.

[0026] The term "laser light source" refers in particular to a laser. Such a laser can be configured in particular to generate laser light having one or more wavelengths in the UV, visible, or infrared, in particular having a wavelength selected from the spectral wavelength range of 200-2000 nm, for example, 300-1500 nm. The term "laser" refers in particular to a device that emits light via a light amplification process based on stimulated emission of electromagnetic radiation. In embodiments, the term "laser" can refer to a solid-state laser. In specific embodiments, the term "laser" or "laser light source" or similar terms refers to a laser diode (or diode laser). In particular, the first light source can include a laser diode, and the second light source can include a laser diode.

[0027] Thus, in an embodiment, the light source comprises a laser light source. In an embodiment, the term "laser" or "solid-state laser" or "solid-state material laser" may refer to one or more of the following: cerium-doped lithium strontium (or calcium) aluminum fluoride (Ce:LiSAF, Ce:LiCAF), chromium-doped chrysoberyl (Alexandrite) laser, chromium ZnSe gold (Cr:ZnSe) laser, divalent samarium-doped calcium fluoride (Sm:CaF2) laser, Er:YAG laser, erbium-doped and erbium- Ytterbium co-doped glass laser, F-center laser, holmium YAG (Ho:YAG) laser, Nd:YAG laser, NdCrYAG laser, neodymium-doped yttrium calcium oxide borate Nd:YCa4O(BO3)3 or Nd:YCOB, neodymium-doped yttrium vanadate (Nd:YVO4) laser, neodymium glass (Nd:glass) laser, neodymium YLF (Nd:YLF) solid-state laser, promethium 147-doped phosphate glass (147Pm 3＋ : glass) solid-state lasers, ruby ​​lasers (Al2O3:Cr 3 ＋), Thulium YAG (Tm:YAG) laser, Titanium Sapphire (Ti: Sapphire; Al2O3:Ti 3＋ ) lasers, trivalent uranium-doped calcium fluoride (U:CaF2) solid-state lasers, ytterbium-doped glass lasers (rods, plates / chips, optical fibers), ytterbium YAG (Yb:YAG) lasers, Yb2O3 (glass or ceramic) lasers, etc.

[0028] For example, including second and third harmonic generation embodiments, the light source may include one or more of the following: a F-centered laser, a Yttrium orthovanadate (Nd:YVO4) laser, a Promethium 147-doped phosphate glass (147Pm 3＋ :glass) and titanium sapphire (Ti:sapphire; Al2O3:Ti 3＋ ) lasers. For example, such light sources can be used to generate blue light, taking into account second and third harmonic generation.

[0029] In an embodiment, the term "laser" or "solid-state laser" or "solid-state material laser" may refer to one or more of the following: semiconductor laser diodes such as GaN, InGaN, AlGaInP, AlGaAs, InGaAsP, lead salts, vertical cavity surface emitting lasers (VCSELs), quantum cascade lasers, hybrid silicon lasers, etc.

[0030] Lasers can be combined with upconverters to achieve shorter wavelengths. For example, upconversion can be achieved using (trivalent) rare earth ions or nonlinear crystals. Alternatively, lasers can be combined with downconverters such as dye lasers to achieve longer wavelengths.

[0031] The term "solid-state material laser" and similar terms may refer to solid-state lasers, such as solid-state lasers based on a crystal or glass body doped with ions (e.g., transition metal ions and / or lanthanide ions), fiber lasers, photonic crystal lasers, semiconductor lasers such as, for example, vertical cavity surface emitting lasers (VCSELs), and the like.

[0032] As will be apparent below, the term "laser light source" can also refer to multiple (different or identical) laser light sources. In certain embodiments, the term "laser light source" can refer to a number N of (identical) laser light sources. In certain embodiments, N = 2 or greater. In a specific embodiment, N can be at least 5, and in particular, at least 8. This allows for higher brightness.

[0033] In embodiments, the (laser) light sources may be arranged in a laser bank (see also above). The (laser) light sources may particularly be arranged in a 2D array in the laser bank. In embodiments, the laser bank may include support, heat dissipation, and optical elements, such as lenses, to align the lasers. Thus, in embodiments, the lasers in a laser bank (or "laser array bank") may share the same support, heat dissipation, and optical elements.

[0034] The (laser) light source can be configured, in particular, to generate source light having an optical axis (O) (beam shape) and a spectral power distribution. In embodiments, the source light can include one or more frequency bands having a known bandwidth for a laser. Thus, the laser light source is configured to generate laser source light (or "laser"). The source light can essentially consist of laser source light. The source light can also include laser source light from two or more (different or identical) laser light sources. For example, the laser source light from two or more (different or identical) laser light sources can be coupled into a light guide to provide a single beam comprising the laser source light from two or more (different or identical) laser light sources. In certain embodiments, the source light is therefore, in particular, collimated source light. In further embodiments, the source light is in particular (collimated) laser source light.

[0035] In some embodiments, the laser source light may include one or more frequency bands having a known bandwidth for the laser. In certain embodiments, the bands may be relatively sharp lines, for example having a full width at half maximum (FWHM) less than 20 nm at room temperature, for example equal to or less than 10 nm. Thus, the source light may have a spectral power distribution (intensity on an energy scale as a function of wavelength) that may include one or more (narrow) bands.

[0036] The beam (of light source light) can be a focused or collimated beam of (laser) light source light. The term "focused" refers, in particular, to converging into a small spot. This small spot can be at, or (slightly) upstream of, or (slightly) downstream of the discrete converter region. In particular, the focusing and / or collimation can be such that the cross-sectional shape (perpendicular to the optical axis) of the beam at (laterally to) the discrete converter region is not substantially larger than the cross-sectional shape (perpendicular to the optical axis) of the discrete converter region (where the light source light illuminates the discrete converter region). Focusing can be performed using one or more optical elements, such as (focusing) lenses. In particular, two lenses can be used to focus the laser light source light. Collimation can be performed using one or more (other) optical elements, such as collimating elements, for example, lenses and / or parabolic mirrors. In embodiments, the (laser) light source beam can be relatively highly collimated, such as, in embodiments, ≤2° (FWHM), more particularly ≤1° (FWHM), and most particularly ≤0.5° (FWHM). Therefore, ≤2° (FWHM) can be considered (highly) collimated source light. Optical elements can be used to provide (high) collimation (see also above). In this document, the term "optical element" may particularly refer to optical devices that influence beam shaping (e.g., collimation and / or focusing of the light). Each laser bank may include one or more optical elements. Therefore, in embodiments, the light generation system may include a first optical element and a second optical element. In embodiments, the first optical element may be arranged downstream of the first light source. Furthermore, the first optical element may be configured to collimate the first light source light into a first beam of collimated first light source light. In embodiments, the second optical element may be arranged downstream of the second light source. Furthermore, the one or more second optical elements may be configured to collimate the second light source light into a second beam of collimated second light source light. Thus, the source light can be provided as (highly) collimated source light.

[0037] The terms "upstream" and "downstream" relate to the arrangement of items or features relative to the propagation of light from a light generating device (here in particular a light source), wherein, relative to a first position within a light beam from the light generating device, a second position in the light beam that is closer to the light generating device is "upstream" and a third position in the light beam that is further away from the light generating device is "downstream".

[0038] Other optical devices known to those skilled in the art may be provided. Such other optical devices may include, for example, wavelength conversion optical devices (e.g., dichroic elements, i.e., wavelength conversion elements described in US7070300B2 (which is incorporated herein by reference) or polarization optical devices (e.g., reflective polarizers).

[0039] In embodiments, the laser device may have a stacked configuration. Thus, the first support and the second support may be configured to be stacked. In particular, the second support may be configured to be stacked on the first support. Thus, the second support may be positioned downstream of the light from the first light source. In embodiments, the second support may include an array of through-holes, in particular, an array of through-hole openings. The through-holes may be configured in various shapes, such as cylindrical, rectangular, or truncated-conical. In embodiments, the through-holes may in particular have a cylindrical shape. In particular, the through-holes may have an elongated cylindrical shape. In certain embodiments, the through-holes may have another elongated shape, such as an elongated rectangular shape or an elongated truncated-conical shape. Generally, the through-holes in the through-hole array may have (substantially) the same shape. In certain embodiments, the through-hole array may include through-holes having different shapes. The through-hole array may in particular be positioned downstream of the light from the light source. In this way, the light from the first light source can propagate through the second support via the through-hole array (in the second support). Furthermore, the through-hole array may be configured to align with the first optical element. Thus, the through-hole array can be configured to allow at least a portion of the collimated first light source light to propagate through the second support via the through-hole array. Thus, the through-hole array facilitates propagation of the first light source light in the stacked laser bank configuration. Specifically, the first 2D array of the first light source can correspond to the pattern of through-holes (of the second support).

[0040] Therefore, in embodiments, the light generating system can be configured to generate system light. The system light can include, in particular, one or more of (collimated) first light source light (propagated through the second support member via the through-hole array) and (collimated) second light source light. In particular, the system light can include the (collimated) first light source light and the (collimated) second light source light. In certain embodiments, the system light can include converted system light.

[0041] In certain embodiments, the second support may include a second cavity. The second cavity can be configured in various shapes, such as cylindrical, square, or truncated cone. Generally, the second cavities in the second support may have (substantially) the same shape. The cavity may be configured to accommodate at least a subset of the first optical elements. In particular, the cavity may be configured to accommodate at least a portion of the full number of first optical elements. In other embodiments, the second cavity may be configured to accommodate the full number of first optical elements. In certain embodiments, the second cavity may also be configured to accommodate at least a subset of the first light sources. Furthermore, the second cavity may also be configured to accommodate the full number of first light sources. In particular, the second cavity may be configured upstream of the through-hole array. That is, light from the first light source may first propagate through the second cavity before entering the through-hole array. In other embodiments, the second cavity may include a through-hole. That is, the second cavity may be a through-hole in the second support that is configured to (i) accommodate at least a subset of the full number of first optical elements and (ii) allow at least a portion of the collimated light from the first light source to propagate through the second support. Thus, the second cavity may provide an arrangement for the first optical element within the second support to be located downstream of the first light source and upstream of the through-hole.

[0042] Here, the first and second supports may specifically have a top side and a bottom side. The top and bottom sides of the supports may specifically be defined relative to the direction of the light source light, i.e., the top side may be aligned with the downstream direction of the light source light relative to the bottom side. Specifically, in one embodiment, the light sources may be disposed on the top side of the support; although in other embodiments, they may be at least partially located within a cavity within the top side of the support. In other embodiments, the top side of the first support and the bottom side of the second support may be configured to contact each other. In particular, in certain embodiments, the top side of the first support and the bottom side of the second support may be configured to physically contact each other. The distance (d1) between the top side of the first support and the bottom side of the second support may be (substantially) 0 mm. In this configuration, the first light source may be accommodated by the second cavity. Therefore, when the first and second supports are configured to contact each other, the light source may be accommodated within the second cavity. Thus, the second cavity may be configured to conform to the 2D array of the first light sources. Consequently, in this configuration, the second optical element may be recessed to provide good thermal contact, thereby improving thermal management.

[0043] In other embodiments where the top side of the first support and the bottom side of the second support are configured to contact each other, the first support may further include a first cavity configured to accommodate the first light source. In such embodiments, the first light source may be accommodated by the first cavity in the first support, and the first optical element may be accommodated by the second cavity in the second support. In certain other embodiments, the first light source and the first optical element may be accommodated by the first cavity in the first support.

[0044] However, in other embodiments, the top side of the first support and the bottom side of the second support can be configured to be at a non-zero distance (d1) from each other. The non-zero distance (d1) can be selected from the range of 0.1-200 mm, such as the range of 0.5-100 mm, and in particular the range of 1-10 mm. In such an embodiment, the first light source can be configured in particular within the space of the non-zero distance (d1). In certain embodiments, the first light source can also be at least partially configured in the first cavity or the second cavity. In particular, the first light source and the one or more first optical devices can be configured so that the light from the first light source reaches the through-hole of the second support. Therefore, the non-zero distance can allow airflow through the light generating system, thereby improving thermal management.

[0045] In some embodiments, the through hole may have a hole axis. The hole axis may be configured to be parallel to the path of the (collimated) light of the first light source. The through hole may have a circular equivalent diameter (DC). The through hole may have a maximum circular equivalent diameter (D C1 The equivalent circular diameter (or ECD) of a two-dimensional (irregular) shape is the diameter of a circle of equivalent area. For example, the equivalent circular diameter of a square with side a is 2 a SQRT(1 / π). For a circle, the diameter is the same as the equivalent circular diameter. If a circle with diameter D in the xy plane is deformed into any other shape (in the xy plane) without changing the area size, the equivalent circular diameter of that shape will be D. The largest circular equivalent diameter D C1 In particular, it can be defined perpendicularly to the hole axis. Maximum circular equivalent diameter D C1 It can be selected from the range of 0.1-5 mm, such as 0.5-3 mm, in particular 1-2 mm. Most particularly, the maximum circular equivalent diameter (D C1 ) can be up to 5 mm. When the through hole is cylindrical, the diameter is essentially constant throughout the height of the through hole. Therefore, the largest circular equivalent diameter is also the smallest circular equivalent diameter, because the diameter is constant over the height. However, in the case of a conical through hole, the diameter can increase or decrease over the height. The maximum diameter is then the largest circular equivalent diameter (D C1). Similarly, this can be applied to through-holes with non-circular cross-sections.

[0046] In some embodiments, for example, when the through hole has a cylindrical shape, the circular equivalent diameter D C can remain (substantially) the same along the through hole. In such an embodiment, the circular equivalent diameter D along the through hole C (essentially) equal to the maximum circular equivalent diameter D C1 In other embodiments, for example, when the through hole is truncated cone-shaped, the circular equivalent diameter D C In such an embodiment, the through hole may have a maximum circular equivalent diameter D C1 and the smallest circular equivalent diameter (D C2 ). Circular equivalent diameter D C2 It can also be defined perpendicular to the hole axis. In addition, the minimum circular equivalent diameter D C2 It may be selected from the range of 0.1-5 mm, such as 0.5-3 mm, in particular 1-2 mm. Thus, the through hole may allow sufficient heat dissipation to cool the light source.

[0047] In other embodiments, the optical element may be formed from a monolithic optical body (e.g., a lens plate). In particular, the second optical element may be formed from a monolithic optical body. This monolithic optical body including the second optical element may be referred to herein as a second monolithic optical body. The second monolithic optical body may include an optical body through-hole. This optical body through-hole may have a variety of shapes, such as cylindrical, square, or frusto-conical. In embodiments, the optical body through-hole may particularly have a cylindrical shape, such as an (elongated) cylindrical shape. Generally, the optical body through-holes may have (substantially) the same shape. In certain embodiments, the optical body through-holes may include optical body through-holes having different shapes. The optical body through-holes may particularly be aligned with the through-holes of the second support member. Furthermore, the optical body through-holes may also be aligned with the path of light from the first light source. Additionally or alternatively, the optical body through-holes of the second support member may be aligned with the path of light from the second light source. Furthermore, in certain embodiments, the monolithic optical body including the first optical element may be referred to herein as a first monolithic optical body. This first monolithic optical body may optionally include a first optical body through-hole. The monolithic body can also be denoted as a lens plate.

[0048] In some embodiments, the first 2D array may have a first array pitch (P1). Furthermore, the second 2D array may also have a second array pitch (P2). The array pitch may be defined as the distance between individual light sources in the 2D array. The array pitch may be selected from the range of 0.1-20 mm, such as the range of 0.5-10 mm, in particular the range of 1-5 mm. Furthermore, the light generating system may have a total pitch of light sources (P A), i.e., the distance between the centers of the individual light sources selected from the first light source and the second light source. In some embodiments, the first array pitch P1 and the second array pitch P2 may be different. In embodiments, the first array pitch P1 and the second array pitch P2 may be (substantially) the same. In such embodiments, the first array pitch P1 and the second array pitch P2 may have a mutual angle (α) of 90°. In such embodiments, P A =0.5 P1. In addition, P A =0.5 P2.

[0049] In embodiments, wherein the first 2D array may have a first array pitch P1 and the second 2D array may have a second array pitch P2, and one or more of the following may apply: (a) the first array pitch and the second array pitch have a mutual angle (α) of 90°, and (b) the light generating system has an overall pitch of light sources P A , where Pa = 0.5 P1.

[0050] In the present invention, since the packaging of the light source can be increased (e.g., doubled) compared to a single laser bank, the intensity of the system light can be increased. Therefore, stacking can result in a high-intensity light source.

[0051] In embodiments, by rotating the second laser bank relative to the first, the laser banks can be stacked because the through-holes and light sources are aligned in the rotated configuration. Thus, when using the same type of laser bank including through-holes configured as an array along with the light source, in certain embodiments, the two arrays can be stacked after being rotated 90°.

[0052] Another option is to use two different types of laser banks, where the light sources of one can be configured differently than the other, to allow the vias in the second laser bank to be configured downstream of the light sources included in the first laser bank.

[0053] In certain embodiments, the first 2D array and / or the second 2D array may (thus) be a square array. In other embodiments, the first 2D array and / or the second 2D array may be a (non-square) rectangular array. Other types of arrays are also possible.

[0054] (Rectangular) arrays can have a maximum array pitch (P L ) and the array's shortest pitch (P S For some rectangular arrays, especially square arrays, the longest pitch of the array (P L ) and the array's shortest pitch (P S) can be essentially the same. For other (rectangular) arrays, the longest pitch of the array (P L ) and the array's shortest pitch (P S ) may be different. Thus, the first 2D array may have a first array longest pitch (P L1 ) and the shortest pitch of the first array (P S1 ). In addition, the second 2D array may have a second array longest pitch (P L2 ) and the second array shortest pitch (P S2 ). In addition, the light generating system can have an overall longest pitch of the light sources (P LA ) and the overall shortest pitch (P SA ), i.e., the pitch based on the combination of the first light source and the second light source, i.e., the pitch when viewed in the upstream direction of the second support. When both arrays are square, the overall pitch may be the same.

[0055] In an embodiment, the first array longest pitch P 1L and the second array longest pitch P 2L can have a mutual angle (α) other than 0° or 180°. In such an embodiment, the mutual angle (α) can be 60° or 90°. In a specific embodiment, P LA =0.5 P L1 In addition, P LA =0.5 P L2 . In addition, in (such) embodiments, P SA =0.5 P S1 And P SA =0.5 P S2 Thus, the density of light sources can be increased since the packaging of light sources can be increased (e.g. doubled) compared to a single laser bank.

[0056] In other embodiments, the centroid wavelengths of the first and second light sources differ. In such embodiments, the first light sources can be substantially identical (particularly with respect to the light source light generated). Furthermore, the second light sources can be substantially identical (particularly with respect to the light source light generated). However, the first and second light sources can be different (particularly with respect to the light source light generated). In such embodiments, the centroid wavelengths of the first and second light sources can differ by at least 5 nm, e.g., at least 10 nm, and particularly at least 20 nm. In particular, the wavelengths of the first and second light sources can be selected such that the system light (including the first and second light sources) is high-intensity white light.

[0057] The term "centroid wavelength", also denoted as λc, is known in the art and refers to the wavelength value where half of the light energy is at shorter wavelengths and half of the energy is at longer wavelengths; this value is expressed in nanometers (nm). It is the wavelength that divides the integral of the spectral power distribution into two equal parts, as shown in the formula λc=Σλ The centroid wavelength can be determined, for example, under operating conditions.

[0058] In certain embodiments, the color points of the first and second light source light can differ. In certain embodiments, the colors or color points of the first and second light source light can be substantially the same when the corresponding color points of the first and second light types differ by a maximum of 0.03 for u' and / or a maximum of 0.03 for v', and even more specifically, by a maximum of 0.02 for u' and / or a maximum of 0.02 for v'. In more specific embodiments, the corresponding color points of the first and second light types can differ by a maximum of 0.01 for u' and / or a maximum of 0.01 for v'. Here, u' and v' are the color coordinates of the light in the CIE 1976 UCS (Uniform Chromaticity Scale) diagram. Alternatively, the color points can be expressed as coordinates in a CIE 1931 color space chromaticity diagram.

[0059] In certain embodiments, the first light source may include at least two different types of first light sources. Furthermore, the second light source may include at least two different types of second light sources. The two different types of first light sources may also differ in one or more of their centroid wavelength and color point. The two different types of second light sources may also differ in one or more of their centroid wavelength and color point. In embodiments, the centroid wavelengths of the first light source light of the at least two different types of first light sources may differ by at least 5 nm, for example, at least 10 nm, or in particular, at least 20 nm. The u' and / or v' color points of the first light source light of the at least two different types of first light sources may specifically differ by at least 0.01, such as at least 0.03, or in particular, at least 0.05. Furthermore, in embodiments, the centroid wavelengths of the second light source light of the at least two different types of second light sources may differ by at least 5 nm, for example, at least 10 nm, or in particular, at least 20 nm. The u' and / or v' color points of the second light source light of the at least two different types of second light sources may specifically differ by at least 0.01, such as at least 0.03, or in particular, at least 0.05. In this way, laser diodes can be used to provide, for example, RGB solutions or other white light solutions. Each laser device may provide an RGB solution or other white light solution together with a laser diode, or the laser device may provide an RGB solution or other white light solution together with a laser diode.

[0060] In certain embodiments, the first optical element and the second optical element may comprise aspheric lenses (also: "aspheric lenses"). An aspheric lens is a rotationally symmetric lens whose surface profile is more complex than a spherical lens (or: "simple lens", i.e., the surface profile of the aspheric lens cannot be described as a portion of a single sphere or a single cylinder). In the case of (diode) lasers, aspheric lenses are particularly useful for collimating light. Most particularly, an aspheric lens can collimate the laser light so that the collimated laser light has a spherical beam shape. Aspheric lenses can also be used to correct optical aberrations that arise from the use of spherical lenses. Thus, the first aspheric lens can be used to generate collimated first light source light having a spherical beam shape without optical aberrations. Furthermore, the second aspheric lens can be used to generate collimated second light source light having a spherical beam shape without optical aberrations.

[0061] Furthermore, the first optical element and the second optical element may be arranged at 90°. In particular, the first aspherical lens and the second aspherical lens may be arranged at 90°.

[0062] In an embodiment, the first laser device may be or may be comprised by the first laser bank.Alternatively or additionally, in an embodiment, the second laser device may be or may be comprised by the second laser bank.

[0063] When lasers are collimated with a spherical lens, the cross-sectional shape of the beam can be particularly rectangular. As a result, the beam density can be higher in one direction of the laser bank than in another orthogonal direction. In such an embodiment, through-holes can be arranged in a direction with a lower density between lasers. This facilitates a higher density of beams, achieving higher light intensity.

[0064] In some embodiments, a laser bank can be used. A laser bank can also be used to increase input power. Therefore, in some embodiments, a system can include multiple light-generating devices arranged in a laser bank. The laser bank can include a light-emitting device comprising a (2D) array of multiple laser diodes arranged on a thermally conductive carrier and a lens array comprising multiple collimator lenses corresponding to the laser diodes, such that each of the multiple laser diodes includes a collimator lens for collimating the laser light emitted by the laser diode. The device can include a packaged architecture or a sealed architecture. In the case of a packaged architecture, the array of laser diode chips is arranged on a thermally conductive carrier. Multiple electrodes can be provided for electrically connecting the multiple laser diodes.

[0065] Thus, in a further embodiment, the first laser bank comprises a first support, a first 2D array of first light sources and a first optical element. In particular, the second laser bank may comprise a second support, a second 2D array of second light sources and a second optical element.

[0066] In particular, a first optical element (e.g., a first aspheric lens) included in the first laser bank can be configured to collimate the first source light into a collimated first beam of the first source light. Prior to collimation, the first source light can have a full width at half maximum (FWHM) ranging from 10° to 30°. Furthermore, the cross-sectional shape of the source light can be elliptical, for example, in embodiments, with a shorter axis within a range of approximately 10° FWHM and a longer axis within a range of approximately 30° FWHM. The collimated first source light can particularly have a beam angle (β1) defined by a first full width at half maximum (FWHM). The beam angle (β1) defined by the first FWHM can be a maximum of (i.e., no greater than) 3°, for example, a maximum of 2°, and particularly a maximum of 1.5°. Using the (first) aspheric lens can result in the collimated source light having a less elliptical shape. Furthermore, using the aspheric lens can provide substantially collimated source light.

[0067] Additionally or alternatively, a second optical element (e.g., a second aspheric lens) included in the second laser bank can be configured to collimate the second source light into a collimated second beam of the second light source. Prior to collimation, the second source light can have a full width at half maximum (FWHM) in the range of 10° to 30°. Furthermore, the cross-sectional shape of the source light (beam) can be elliptical, for example, in embodiments with a shorter axis in the range of approximately 10° FWHM and a longer axis in the range of approximately 30° FWHM. The collimated second source light can, in particular, have a beam angle (β2) defined by a second full width at half maximum (FWHM). The beam angle (β2) defined by the second FWHM can be at most 3°, for example, at most 2°, and particularly at most 1.5°. Using the (second) aspheric lens can result in the collimated source light having a less elliptical shape. Furthermore, using the aspheric lens can provide substantially collimated source light.

[0068] In certain embodiments, the light generating system may further include a homogenizer element. This homogenizer element may, in particular, comprise a beam homogenizer, i.e., an element configured to homogenize a (laser) beam having an irregular energy distribution (e.g., a Gaussian energy distribution) and provide a (laser) beam having a uniform energy distribution. Specifically, the homogenizer element may be configured to homogenize a first beam of collimated first light source light and a second beam of collimated second light source light. Thus, the homogenizer element may be positioned downstream of the first and second optical components. In this manner, the source light of the laser light source can only escape through the homogenizer element. Consequently, the homogenizer element may provide system light comprising a more uniform (laser) beam.

[0069] In further embodiments, the light generating system may include a system light window. This system light window may be transparent and configured to couple the (homogenized) light source light out as system light. Thus, the system light window may be positioned downstream of the homogenizer element. In embodiments, this system light window may be provided as part of a light device (described further below). In certain embodiments, the system light window may include a homogenizer element. In some embodiments, the system light window may be the homogenizer element.

[0070] In embodiments, the light generating system can be configured to provide light comprising the first light source light and / or the second light source light in an operating mode of the light generating system. In further embodiments, the light generating system can be configured to provide light comprising the first light source light and the second light source light in another operating mode of the light generating system. In certain embodiments, the system light can include homogenized light provided by a homogenizer element (after homogenizing the collimated light source light). Furthermore, the system light can be provided after being coupled out through a system light window.

[0071] The first light source and / or the second light source can be controlled. In other embodiments, a subset of the first light sources can be individually controlled and / or a subset of the second light sources can be individually controlled. Thus, in embodiments, the first light source and the second light source can be controlled. Thus, the light generating system can include a control system or can be functionally coupled to a control system.

[0072] The term "control" and similar terms particularly refer to at least determining the behavior of a component or supervising its operation. Thus, "control" and similar terms herein may, for example, refer to applying an action to a component (determining the action or supervising its operation), such as measuring, displaying, actuating, opening, shifting, changing temperature, etc. Furthermore, the term "control" and similar terms may also include monitoring. Thus, the term "control" and similar terms may encompass applying an action to a component as well as applying an action to and monitoring the component. Control of a component may be accomplished using a control system, which may also be denoted as a "controller." The control system and the component may thus be functionally coupled, at least temporarily or permanently. The component may include a control system. In some embodiments, the control system and the component may not be physically coupled. Control may be accomplished via wired and / or wireless control. The term "control system" may also refer to multiple different control systems, particularly those that are functionally coupled, where, for example, one control system may be a master control system and one or more other control systems may be slave control systems. A control system may include or be functionally coupled to a user interface.

[0073] The control system can also be configured to receive and execute instructions from a remote control. In an embodiment, the control system can be controlled via an application on a device, such as a portable device such as a smartphone or iPhone, a tablet, etc. Thus, the device is not necessarily coupled to the lighting system, but can be (temporarily) functionally coupled to the lighting system.

[0074] Therefore, in embodiments, the control system can (also) be configured to be controlled by an application on a remote device. In such embodiments, the lighting system's control system can be a slave control system or controlled in slave mode. For example, a lighting system can be identified by a code, particularly a unique code for each lighting system. The lighting system's control system can be configured to be controlled by an external control system that accesses the lighting system based on knowledge of the (unique) code (entered via a user interface with an optical sensor (e.g., a QR code reader)). The lighting system can also include means for communicating with other systems or devices, such as using Bluetooth, Thread, Wi-Fi, LiFi, ZigBee, BLE, WiMAX, or other wireless technologies.

[0075] A system, or device, or apparatus may perform actions in a "mode" or "operating mode" or "mode of operation" or "operational mode". The term "operational mode" may also be expressed as "control mode". Similarly, in a method, actions, phases, or steps may be performed in a "mode" or "operating mode" or "mode of operation" or "operational mode". This does not exclude that a system, device, or apparatus may also be adapted to provide another control mode or multiple other control modes. Similarly, this may not exclude that one or more other modes may be executed before and / or after the execution of a mode.

[0076] However, in embodiments, a control system may be available that is adapted to provide at least one control mode. If other modes are available, selection of these modes may in particular be performed via a user interface, although other options (such as implementing modes based on sensor signals or (time) schedules) are also possible. In embodiments, an operating mode may also refer to a system, device, or apparatus that is only capable of operating in a single operating mode (i.e., "on" without further tunability).

[0077] Therefore, in an embodiment, the control system may be controlled according to 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.

[0078] As described above, (diode) lasers can be used to provide, for example, RGB solutions or other white light solutions. A diffuser element can be positioned downstream of the laser device. This allows the source light of the laser light source to escape solely through the diffuser element. In embodiments, the system light can therefore consist essentially of the first and / or second light source light escaping from the system via the diffuser element. In particular, the diffuser element can be positioned downstream of the first and / or second light sources. Thus, the diffuser element can be configured to diffuse at least a portion of the first light source light into diffused light. Additionally or alternatively, the diffuser element can be configured to diffuse at least a portion of the second light source light into diffused light. The diffused light can therefore include at least a portion of the first and / or second light source light. The system light can include (a) one or more of the first and second light sources, and (b) the diffused light.

[0079] Additionally or alternatively, however, a luminescent material (particularly a phosphor-based luminescent material) may be used to convert at least a portion of the light source light. The luminescent material may be configured to convert at least a portion of the first light source light and / or at least a portion of the second light source light into luminescent material light, wherein the luminescent material is configured downstream of the first and second light sources. In certain embodiments, this may result in white system light. This white system light may include (a) one or more of the first and second light sources light, and (b) the luminescent material light.

[0080] In particular, the light generating system can be configured to provide system light comprising luminescent material light, first light source light, and / or second light source light in an operating mode of the light generating system. However, in embodiments, the light generating system can be configured to provide system light comprising diffuse light, first light source light, and / or second light source light in an operating mode of the light generating system. Furthermore, in embodiments, the light generating system can be configured to provide system light comprising luminescent material light and diffuse light in an operating mode of the light generating system. In particular, the system light can include one or more of (a) luminescent material light, (b) diffuse light, and (c) first light source light and second light source light. In particular embodiments, the system light can be white light having a color rendering index of at least 80 and a correlated color temperature selected from the range of 1800-10000K.

[0081] 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. In this context, UV especially refers to wavelengths selected from the range of 190-380 nm, such as 200-380 nm.

[0082] The term "white light" and similar terms herein are known to those skilled in the art. For general lighting, this refers in particular to light in the range of approximately 2000K to 7000K, for example, in the range of 2700K and 6500K. It may particularly refer to light with a correlated color temperature (CCT) between approximately 1800K and 20,000K, for example, between 2000K and 20,000K, and in particular between 2700 and 20,000K. In embodiments, for example, for backlighting purposes or for other purposes, the correlated color temperature (CCT) may particularly be in the range of approximately 7000K and 20,000K. Furthermore, in embodiments, the correlated color temperature (CCT) is particularly within approximately 15 SDCM (standard deviation of color matching) from the BBL (blackbody locus), particularly within approximately 10 SDCM from the BBL, and even more particularly within approximately 5 SDCM from the BBL.

[0083] In certain embodiments, the correlated color temperature (CCT) may be selected from the range of 6000-12000 K, such as from the range of 7000-12000 K, such as at least 8000 K. Furthermore, in embodiments, the correlated color temperature (CCT) may be selected from the range of 6000-12000 K, such as from the range of 7000-12000 K, in combination with a CRI of at least 70.

[0084] In certain embodiments, a light generating system can be configured to provide system light comprising light from a first light source and light from a second light source. The light generating system can be configured in this manner, in particular, in an operating mode of the light generating system. Here, the system light can be white light having a color rendering index of at least 60, such as at least 80, and particularly at least 90. Furthermore, the system light can have a correlated color temperature selected from the range of 1600-21000K, such as 1800-20000K, and particularly 2000-10000K.

[0085] Thus, the light generating system may comprise two stacked laser banks generating (narrow) beams of first and second light source light, together providing high intensity white system light.

[0086] The light generating system can be, for example, part of or used in an office lighting system, a home application system, a store lighting system, a household lighting system, an accent lighting system, a spotlighting system, a theater lighting system, a fiber optic application system, a projection system, a self-illuminating display system, a pixelated display system, a segmented display system, a warning sign system, a medical lighting application system, an indicator sign system, a decorative lighting system, a portable system, an automotive application, an (outdoor) road lighting system, an urban lighting system, a greenhouse lighting system, horticultural lighting, digital projection, or LCD backlighting. The light generating system (or luminaire) can be, for example, part of or used in an optical communication system or a disinfection system.

[0087] In yet another aspect, the present invention further provides a lamp or luminaire comprising a light-generating system as defined herein. The luminaire may further include a housing, optical elements, a light-shielding grid, and the like. The lamp or luminaire may further include a housing enclosing the light-generating system. The lamp or luminaire may include a light window or housing opening in the housing through which system light may escape from the housing. In yet another aspect, the present invention further provides a projection device comprising a light-generating system as defined herein. In particular, a projection device, or "projector," or "image projector," may be an optical device that projects an image (or moving image) onto a surface, such as a projection screen. The projection device may include one or more light-generating systems as described herein. Thus, in one aspect, the present invention further provides an illumination device selected from the group consisting of a lamp, a luminaire, a projector device, a disinfection device, a photochemical reactor, and an optical wireless communication device, comprising a light-generating system as defined herein. The illumination device may include a housing or carrier configured to house or support one or more elements of the light-generating system. For example, in embodiments, the illumination device may include a housing or carrier configured to house or support one or more light-generating systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings, in which corresponding reference characters indicate corresponding parts, and in which: Figure 1A-1F illustrative embodiments of light generating systems or components thereof.

[0089] Figure 2A-2C A further embodiment of a light generating system is schematically depicted.

[0090] Figure 3A-Figure 3B A top view of an embodiment of a light generating system is schematically depicted.

[0091] Figure 4 Some applications of light generating systems are schematically depicted.

[0092] The schematic diagrams are not necessarily drawn to scale. DETAILED DESCRIPTION

[0093] us Figure 1A-1B Schematically depicting various embodiments of the light generating system 1000. Here, in embodiments, the light generating system 1000 may include a first support 2100, a first 2D array 2110 of first light sources 10, a first optical element 410, a second support 2200, a second 2D array 2210 of second light sources 20, and a second optical element 420.

[0094] Furthermore, the first support 2100 can be configured to support the first light source 10, and the second support 2200 can be configured to support the second light source 20. The first light source 10 can be specifically configured to generate the first light source light 11, and the second light source 20 can be configured to generate the second light source light 21. In particular, the first light source 10 can include a laser diode, and the second light source 20 can include a laser diode. Furthermore, the first support 2100 can include a first thermally conductive element 2160 and / or the second support 2200 can include a second thermally conductive element 2260.

[0095] In an embodiment, first optical element 410 may be configured downstream of first light source 10 and may be further configured to collimate first light source light 11 into first beam 15 of collimated first light source light 11. Similarly, second optical element 420 may be configured downstream of second light source 20 and may also be configured to collimate second light source light 21 into second beam 25 of collimated second light source light 21.

[0096] In particular, the first support 2100 and the second support 2200 can be configured to be stacked. The second support 2200 can include an array 2220 of through holes 2250, which are configured to align with the first optical element 410. Thus, the through holes can allow at least a portion of the collimated first light source light 11 to propagate through the second support 2200.

[0097] Specifically, embodiments of the light generating system 1000 may be configured to generate system light 1001 including one or more of the first light source light 11 and the second light source light 21 .

[0098] Furthermore, in an embodiment, the light generating system 1000 may include a first laser device 4100, which includes a first laser bank 3100, which includes a first support 2100, a first 2D array 2110 of first light sources 10, and a first optical element 410. The light generating system 1000 may also include a second laser device 4200, which includes a second laser bank 3200, which includes a second support 2200, a second 2D array 2210 of second light sources 20, and a second optical element 420.

[0099] In particular, first optical element 410 can be configured to collimate first light source light 11 into a first beam 15 of collimated first light source light 11, wherein first beam 15 has a beam angle (β1) defined by a first full width at half maximum of 2°. Furthermore, second optical element 420 can be configured to collimate second light source light 21 into a second beam 25 of collimated second light source light 21, wherein second beam 25 has a beam angle (β2) defined by a second full width at half maximum of 2°.

[0100] In an embodiment, first light source light 11 and second light source light 21 may have a centroid wavelength difference of at least 10 nm.

[0101] In particular, the first optical element 410 and the second optical element 420 may include aspherical lenses. In addition, one or more optical elements 410 and the second optical element 420 may be arranged at 90 degrees.

[0102] Furthermore, the light generating system 1000 can be configured to provide system light 1001 including the first light source light 11 and the second light source light 21 in an operating mode of the light generating system 1000. In an embodiment, the system light 1001 can be white light having a color rendering index of at least 80 and a correlated color temperature selected from the range of 1800-20000K.

[0103] In certain embodiments, the first thermally conductive element 2160 and the second thermally conductive element 2260 can be selected from a heat sink, a heat spreader, and a two-phase cooling device, respectively.

[0104] like Figure 1A as well as Figure 1D As shown in embodiment (I) in FIG, the top side 2101 of the first support member 2100 and the bottom side 2202 of the second support member 2200 can be configured to contact each other, in particular, to physically contact each other. Here, the distance (d1) can be substantially zero. Reference numeral 2201 denotes the top side of the second support member 2200.

[0105] exist Figure 1A as well as Figure 1B In embodiments (II) and (III), the top side 2101 of the first support 2100 and the bottom side 2202 of the second support 2200 may be configured to be at a non-zero distance (d1) from each other.

[0106] In addition, if Figure 1A As shown in embodiment (I) in FIG, the second support member 2200 may include a cavity 2300, in particular, a second cavity 2320. The second cavity 2320 may be configured to accommodate at least a subset of the first optical element 410. In particular, the second cavity 2320 may be configured upstream of the through hole 2250 or include the through hole 2250.

[0107] Specifically, Figure 1B An embodiment of a light generating system 1000 is depicted, in which the first light source 10 can specifically include at least two different types of first light sources 10, and the second light source 10 can further include at least two different types of second light sources 20. Here, the first light sources 10 can differ in one or more of the following: (a) centroid wavelength, (b) color point, and (c) correlated color temperature. The second light sources 20 can also differ in one or more of the following: (a) centroid wavelength, (b) color point, and (c) correlated color temperature. Here, the centroid wavelengths can differ by at least 10 nm. Furthermore, u' can differ by at least 0.03 and / or v' can differ by at least 0.03. Thus, a first light source 10' of a first type can generate first light source light 11', and a second light source 10" of a second type can generate first light source light 11" having a different spectral power distribution than first light 11. Furthermore, a second light source 20' of a first type can generate second light source light 21', while a second light source 20 of a different type can generate second light source light 21".

[0108] Figure 1C A second optical element 420 is depicted as being comprised of a second monolithic optical body 2410 including an optical body through-hole 2450 aligned with the through-hole 2250. Here, the second optical elements 420 may have a second optical element pitch P3, i.e., the distance from the center of one second optical element 420 to another second optical element 420.

[0109] Figure 1D An embodiment of a light generating system 1000 is depicted, wherein a first support 2100 can include a cavity 2300, and in particular a first cavity 2310. The first cavity 2310 can be configured to accommodate at least a subset of the first light sources 10. The light generating system 1000 also includes a first thermally conductive element 2160 and an air blower fan 2165 that provides an air flow 2166 to the first thermally conductive element 2160.

[0110] Figure 1E-1F A monolithic body 2410 including a second optical element 420, in particular a lens, is schematically depicted. Monolithic body 2410 may in particular be a second monolithic body 2410 formed of a second laser device 4200. Second monolithic body 2410 may include an optical body through-hole 2450 aligned with through-hole 250 of second support 2200. Through-hole 2250 may have a hole axis 2251.

[0111] Figure 1E An embodiment is specifically depicted in which the second optical element 420 comprises a circular lens, although other shapes are possible. The arrangement density of the lasers in the Y direction is equal to the arrangement density of the light sources in the X direction.

[0112] Figure 1F The embodiment in which the second optical element 420 includes an aspherical lens is specifically described. The arrangement density of the lasers in the Y direction is lower than the arrangement density of the light sources in the X direction.

[0113] Figure 2A-2B A light generating system 1000 is schematically depicted and further includes (a) a diffuser element 710 and (b) a luminescent material 200. The diffuser element 710 may be disposed, in particular, downstream of the first light source 10 and the second light source 20. The diffuser element 710 may also be configured to diffuse at least a portion of the first light source light 11 and / or at least a portion of the second light source light 21 into diffused light 711. The luminescent material 200 may also be disposed downstream of the first light source 10 and the second light source 20. The luminescent material 200 may also be configured to convert at least a portion of the first light source light 11 and / or at least a portion of the second light source light 21 into luminescent material light. Here, the light generating system 1000 may be configured to provide, in an operating mode of the light generating system 1000, system light 1001 comprising the luminescent material light 201 and the diffused light 711. The system light 1001 may, in particular, be white light having a color rendering index of at least 80 and a correlated color temperature selected from the range of 1800-10000 K.

[0114] Specifically, Figure 2A An embodiment of a light generating system 1000 is depicted, which includes a luminescent material 200 arranged downstream of the light sources 10, 20. The illustrated light generating system 1000 also includes a diffuser element 710 arranged downstream of the luminescent material 200. System light 1001, which includes the first light source light 11 and / or the second light source light 21, can be configured, at least in part, as system light comprising at least the luminescent material light 201. The latter (converted) system light is denoted by reference numeral 1001′.

[0115] However, Figure 2B One embodiment of a light generating system 1000 is depicted that includes a diffuser element 710 disposed downstream of the light sources 10, 20. The depicted light generating system 1000 also includes a luminescent material 200 disposed downstream of the diffuser element 710.

[0116] In particular, Figure 2A One embodiment is depicted that includes two configurations of a first laser device 4100 and a second laser device 4200. In one configuration, the first laser device 4100 and the second laser device 4200 are stacked aligned with each other. In another configuration, the first laser device 4100 and the second laser device 4200 are stacked partially overlapping each other; see, e.g. Figure 3A-Figure 3B .

[0117] Furthermore, Figure 2CA light generating system 1000 is depicted that includes a homogenizer element 720. Homogenizer element 720 can be configured to homogenize a first light beam 15 of collimated first light source light 11 and a second light beam 25 of collimated second light source light 21. Thus, homogenizer element 720 can be configured downstream of light sources 10, 20. Light generating system 1000 can also include a system light window 750 disposed downstream of homogenizer element 720. Thus, light generating system 1000 can be configured to provide system light 1001, in particular, homogenized system light 721, comprising first light source light 11 and second light source light 21, in an operating mode of light generating system 1000.

[0118] Figure 3A-Figure 3B A top view of the light generating system 1000 is depicted. Here, the through hole 2250 may have a hole axis 2251. Furthermore, the through hole 2250 may have a maximum circular equivalent diameter D defined perpendicular to the hole axis 2251 of a maximum of 5 mm. C1 In particular, the maximum circular equivalent diameter D C1 It can be selected from the range of 0.5-3 mm.

[0119] like Figure 3A As shown, the through-holes 2250 may have a cylindrical shape, in particular an elongated cylindrical shape. In particular, the first 2D array 2110 may have a first array pitch P1. Similarly, the second 2D array 2210 may have a second array pitch P2. The first array pitch P1 and the second array pitch P2 may in particular have a mutual angle α of 90°. Therefore, the light generating system 1000 may have a total pitch P of the light sources (10, 20). A Therefore, P A =0.5 P1. In addition, P A =0.5 P2.

[0120] like Figure 3B As shown, the through hole 2250 can have a rectangular shape, especially suitable for the shape of the laser bar. In addition, the first 2D array 2110 can have the longest first array pitch P L1 and the shortest first array pitch P S1 Similarly, the second 2D array 2210 may have the longest second array pitch P L2 and the shortest second array pitch P S2 Thus, the light generating system 1000 may have an overall longest pitch P of the light sources 10, 20. LA and the overall shortest pitch P LA .

[0121] In an alternative embodiment, the first support 2100 and the second support 2200 may be rotated, see also FIG. 3 a .

[0122] In other embodiments, two different types of first and second supports 2100, 2200 are used, wherein the hole positions and light source positions are interchanged. Also in this way, a light generating system with a small pitch and therefore a high intensity can be applied.

[0123] Depending on the choice, the supports 2100, 2200 can be stacked and arranged essentially on top of each other, as in Figure 3a and Figure 2a on the right, or can be stacked and displaced, as in Figure 3b and Figure 2a on the left.

[0124] Figure 4 An embodiment of a luminaire 2 comprising a light generating system 1000 as described above is schematically depicted. Reference numeral 301 denotes a user interface which may be functionally coupled to a control system 300 comprised by the light generating system 1000 or functionally coupled thereto. Figure 4 An embodiment of a lamp 1 including a light generating system 1000 is also schematically depicted. Reference numeral 3 denotes a projector device or projector system, which can be used, for example, to project an image on a wall and can also include the light generating system 1000. Thus, FIG3 schematically depicts an embodiment of a lighting device 1200 selected from the group consisting of a lamp 1, a lamp fixture 2, a projector device 3, a disinfection device, a photochemical reactor, and an optical wireless communication device, and comprising the light generating system 1000 as described herein. In embodiments, such a lighting device can be a lamp 1, a lamp fixture 2, a projector device 3, a disinfection device, an optical wireless communication device, or an automotive lighting device. Lighting device light escaping from lighting device 1200 is denoted by reference numeral 1201. Lighting device light 1201 can essentially consist of system light 1001 and, therefore, in certain embodiments, can be system light 1001. Reference numeral 1300 denotes a space, such as a room. Reference numeral 1305 denotes a floor, reference numeral 1310 denotes a ceiling, and reference numeral 1307 denotes a wall.

[0125] The term "plurality" means two or more.

[0126] The terms "substantially" or "essentially" and similar terms herein will be understood by those skilled in the art. The terms "substantially" or "essentially" may also include embodiments with "completely," "entirely," "entirely," etc. Therefore, in embodiments, the adjectives "substantially" or "essentially" may also be removed. Where applicable, the terms "substantially" or "essentially" may also relate to 90% or higher, such as 95% or higher, in particular 99% or higher, even more in particular 99.5% or higher, including 100%.

[0127] The term "comprising" also includes embodiments wherein the term "comprising" means "consisting of.

[0128] The term "and / or" specifically refers to one or more items mentioned before and after "and / or". For example, the phrase "item 1 and / or item 2" and similar phrases can refer to one or more of item 1 and item 2. The term "comprising" can mean "consisting of" in one embodiment, but can also mean "containing at least the defined categories and optionally one or more other categories" in another embodiment.

[0129] Furthermore, the terms first, second, third, etc. in the description and claims are used to distinguish similar elements and not necessarily to describe 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 those described or illustrated herein.

[0130] These devices, apparatuses or systems may be described herein during operation. It will be clear to those skilled in the art that the present invention is not limited to methods of operation, or devices, apparatuses or systems in operation.

[0131] 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.

[0132] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

[0133] The use of the verb "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 specification and claims, the words "comprise," "comprising," etc. are to be construed in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to."

[0134] The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0135] The present invention can be implemented by means of hardware comprising several distinct elements and by means of a suitably programmed computer. In a device claim, apparatus claim, or system claim enumerating several means, several of these means may be implemented by the same item of hardware. The 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 another aspect, the present invention (therefore) provides a software product that, when run on a computer, is capable of implementing (one or more embodiments of) the method described herein.

[0136] The present invention also provides a control system that can control an apparatus, device, or system, or can perform the methods or processes described herein. Furthermore, the present invention provides a computer program product that, when executed on a computer functionally coupled to or included in an apparatus, device, or system, controls one or more controllable elements of such an apparatus, device, or system.

[0137] The present invention also applies to an apparatus, device or system comprising one or more of the characterizing features described in the specification and / or shown in the accompanying drawings. The present invention also relates to a method or process comprising one or more of the characterizing features described in the specification and / or shown in the accompanying drawings.

[0138] The various aspects discussed in this patent can be combined to provide additional advantages. In addition, those skilled in the art will understand that the embodiments can be combined, and more than two embodiments can also be combined. In addition, some features can form the basis of one or more divisional applications.

Claims

1. A light generating system (1000), comprising a first support (2100), a first 2D array (2110) of first light sources (10), a first optical element (410), a second support (2200), a second 2D array (2210) of second light sources (20), and a second optical element (420), wherein: - the first support member (2100) is configured to support the first light source (10) and the second support member (2200) is configured to support the second light source (20); the first light source (10) is configured to generate first light source light (11) and the second light source (20) is configured to generate second light source light (21); wherein the first light source (10) includes a laser diode and the second light source (20) includes a laser diode; wherein the first support member (2100) includes a first heat conducting element (2160) and / or wherein the second support member (2200) includes a second heat conducting element (2260); - the first optical element (410) is arranged downstream of the first light source (10) and is arranged to collimate the first light source light (11) into a first beam (15) of collimated first light source light (11); the second optical element (420) is arranged downstream of the second light source (20) and is arranged to collimate the second light source light (21) into a second beam (25) of collimated second light source light (21); - the first support (2100) and the second support (2200) are configured to be stacked, wherein the second support (2200) comprises an array (2220) of through holes (2250), the through holes being configured to align with the first optical element (410) to allow at least a portion of the collimated first light source light (11) to propagate through the second support (2200); - a first laser bank (3100) comprising the first support (2100), the first 2D array (2110) of the first light source (10), and the first optical element (410), and / or a second laser bank (3200) comprising the second support (2200), the second 2D array (2210) of the second light source (20), and the second optical element (420); - the first optical element (410) is configured to collimate the first light source light (11) into a first light beam (15) of collimated first light source light (11) having a beam angle (β1) defined by a first full width at half maximum of 2°, and / or the second optical element (420) is configured to collimate the second light source light (21) into a second light beam (25) of collimated second light source light (21) having a beam angle (β2) defined by a second full width at half maximum of 2°; and The light generating system (1000) is configured to generate system light (1001) including one or more of the first light source light (11) and the second light source light (21).

2. The light generating system (1000) of claim 1, wherein the second support (2200) comprises a second cavity (2300), wherein the second cavity (2300) is configured to accommodate at least a subset of the first optical elements (410).

3. The light generating system (1000) according to any one of the preceding claims 1 to 2, wherein the top side (2101) of the first support (2100) and the bottom side (2202) of the second support (2200) are configured to be in contact with each other, or wherein the top side (2101) of the first support (2100) and the bottom side (2202) of the second support (2200) are configured to be at a non-zero distance (d1) from each other.

4. The light generating system (1000) according to any one of the preceding claims, wherein the through hole (2250) has a hole axis (2251), wherein the through hole (2250) has a maximum circular equivalent diameter D of a maximum of 5 mm defined perpendicular to the hole axis (2251). C1 .

5. The light generating system (1000) according to any one of the preceding claims, wherein the through hole (2250) has a cylindrical shape.

6. The light generating system (1000) of any preceding claim, wherein the second optical element (420) is constituted by a monolithic optical body (2410), the monolithic optical body (2410) comprising an optical body through hole (2450) aligned with the through hole (2250); wherein the first thermally conductive element (2160) and the second thermally conductive element (2260) are each selected from the group consisting of: a heat sink, a heat spreader, and a two-phase cooling device.

7. The light generating system (1000) of any of the preceding claims, wherein the first 2D array (2110) has a first array pitch (P1), wherein the second 2D array (2210) has a second array pitch (P2), wherein one or more of the following applies: (a) the first array pitch (P1) and the second array pitch (P2) have a mutual angle (α) of 90°, and (b) the light generating system (1000) has an overall pitch (P) of light sources (10, 20) of A ), where Pa=0.5 P1.

8. The light generating system (1000) of any one of the preceding claims, wherein the first light source light (11) and the second light source light (21) have a centroid wavelength difference of at least 10 nm.

9. The light generating system (1000) according to any one of the preceding claims, wherein the first optical element (410) and the second optical element (420) comprise aspherical lenses.

10. The light generating system (1000) according to claims 6 and 9, wherein the second optical element (420) comprises a lens of a substantially rectangular shape, wherein the through hole (2250) is configured at a position between a subset of three or four second optical elements (420); and wherein the monolithic optical body (2410) comprises the lens of the substantially rectangular shape.

11. The light generating system (1000) according to any one of the preceding claims, wherein: - the first light source (10) comprises at least two different types of first light sources (10), the at least two different types of first light sources (10) differing in one or more of: (a) centroid wavelength, wherein the centroid wavelengths differ by at least 10 nm, and (b) color point, wherein u' differs by at least 0.03 and / or wherein v' differs by at least 0.03, and / or - the second light source (10) comprises at least two different types of second light sources (20), the at least two different types of second light sources (20) differing in one or more of: (a) centroid wavelength, wherein the centroid wavelengths differ by at least 10 nm, and (b) color point, wherein u' differs by at least 0.03 and / or wherein v' differs by at least 0.

03.

12. The light generating system (1000) of any preceding claim, wherein the first laser bank (3100) comprises the first 2D array (2110) and a shared first support (2100), a shared first heat sink (2160), and a shared first optical element (410), and / or wherein the second laser bank (3200) comprises the second 2D array (2210) and a shared second support (2100), a shared second heat sink (2260), and a shared second optical element (420).

13. The light generating system (1000) according to any one of the preceding claims, wherein: The light generating system (1000) comprises a homogenizer element (720) configured to homogenize a first light beam (15) of the collimated first light source light (11) and a second light beam (25) of the collimated second light source light (21); the light generating system (1000) further comprises a system light window (750) arranged downstream of the homogenizer element (720); and the light generating system (1000) is configured to provide homogenized system light (1001) comprising the first light source light (11) and the second light source light (21) in an operating mode of the light generating system (1000).

14. The light generating system (1000) of any preceding claim, further comprising (a) a diffuser element (710) and (b) a luminescent material (200), wherein: (a) the diffuser element (710) is arranged downstream of the first light source (10) and the second light source (20), and the diffuser element (710) is arranged to diffuse at least a portion of the first light source light (11) and / or at least a portion of the second light source light (21) into diffused light (711), and (b) the luminescent material (200) is arranged downstream of the first light source (10) and the second light source (20), and the luminescent material (200) is arranged to diffuse the At least a portion of the first light source light (11) and / or at least a portion of the second light source light (21) is converted into luminescent material light (201); wherein the light generating system (1000) is configured to provide system light (1001) comprising the luminescent material light (201) and the diffuse light (711) in an operating mode of the light generating system (1000), wherein the system light (1001) is white light having a color rendering index of at least 80 and a correlated color temperature selected from the range of 1800K to 10000K.

15. A lighting device (1200) selected from the group consisting of a lamp (1), a luminaire (2), a projector device (3), a disinfection device, a photochemical reactor, an automotive lighting device, and an optical wireless communication device, the lighting device (1200) comprising a light generating system (1000) according to any one of the preceding claims.

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