A laser lighting device

Abstract

A laser lighting device (1) is disclosed, comprising a laser light source (2) comprising a set of n1≥2 lasers (3, 4, 5, 6) and configured such that the operation of at least different subsets (7, 8; 17, 18) of lasers can be controlled individually. At least one first optical element (11) is configured to collimate the laser light emitted by the respective ones of a first subset of lasers and a second subset of lasers to produce a first beam of laser light and a second beam of laser light, respectively. At least one second optical element (12, 13, 14) is configured to direct the first beam of laser light and the second beam of laser light, respectively, towards a diffuser (15). The laser lighting device is configured such that the first beam of laser light and the second beam of laser light, respectively, directed by the at least one second optical element towards the diffuser has a center axis that is offset with respect to 0 an optical axis (OA) between the at least one second optical element and the diffuser by a first offset and a second offset, respectively, wherein the second offset is different from the first offset.

Description

[0001] 2024PF80048

[0002] 1

[0003] A laser lighting device

[0004] FIELD OF THE INVENTION

[0005] The present invention relates to a laser lighting device.

[0006] BACKGROUND OF THE INVENTION

[0007] Laser lighting may be used in various devices such as projectors, automotive headlamps and stage lighting devices. For example, a stage lighting device may include a so called moving head light, which may include a laser light source arranged in an element which can be moved to permit it to pan, tilt or change position in some other way so as to be able to direct the light-emitting output of the laser light source in different directions. In such a stage lighting device as well as in other devices using laser lighting, red, blue and green laser light may be combined to obtain white light, which may be output from the device. Further, in such devices, the laser light is typically focused on a small spot on a diffuser in order to make the light output from the devices safe for the naked eyes of a viewer or user. Thereby, eye-safe laser lighting can be provided. It is however desired into increase the functionality of eye-safe laser lighting as used in various devices such as projectors, automotive headlamps and stage lighting devices.

[0008] US10559943B2 discloses a laser assembly for generating an assembly output beam and that includes a laser subassembly that emits a plurality of spaced apart laser beams, a beam adjuster, a transform lens, a beam combiner, and an output coupler. The beam adjuster adjusts the spacing between the plurality of laser beams. The transform lens focuses the laser beams at a focal plane and the beam combiner is positioned at the focal plane. The beam combiner combines the lasers beams to provide a combination beam. Further, the output coupler redirects at least a portion of the combination beam back to the beam combiner as a redirected beam and transmits a portion of the combination beam as the assembly output beam.

[0009] SUMMARY OF THE INVENTION

[0010] In view of the above, a concern of the present invention is to provide a lighting device capable of providing eye-safe laser lighting and which may exhibit an increased functionality in comparison with the conventional lighting devices capable of providing eyesafe laser lighting.

[0011] To address at least one of this concern and other concerns, a laser lighting device in accordance with the independent claim is provided. Preferred embodiments are defined by the dependent claims.

[0012] According to a first aspect of the present invention, a laser lighting device is provided. The laser lighting device is configured to, in operation, emit device light. The laser lighting device comprises a laser light source, comprising a set of nl lasers each of which is configured to, in operation, emit laser light. The laser light source is configured such that the operation of at least different subsets of the set of nl lasers can be controlled individually, wherein nl > 2. The laser lighting device comprises a controller. The controller is configured to control operation of the different subsets of the lasers individually. The controller is configured to control operation of a first subset of the set of nl lasers and a second subset of the set of nl lasers individually, wherein the second subset of the set of nl lasers is different from the first subset of the set of nl lasers. The laser lighting device comprises at least one first optical element configured to collimate the laser light emitted by the respective ones of the first subset of the set of nl lasers and the second subset of the set of nl lasers to produce a first beam of laser light and a second beam of laser light, respectively. The laser lighting device comprises a diffuser. The laser lighting device comprises at least one second optical element configured to direct the first beam of laser light and the second beam of laser light, respectively, towards the diffuser. The respective ones of the first subset of lasers and the second subset of lasers are arranged in relation to the at least one second optical element, or vice versa, such that the first beam of laser light and the second beam of laser light, respectively, directed by the at least one second optical element towards the diffuser has a center axis that is offset with respect to an optical axis between the at least one second optical element and the diffuser (or more generally an optical axis of the laser lighting device) by a first offset and a second offset, respectively, wherein the second offset is different from the first offset. The device light comprises at least laser light produced by the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser and subsequently diffused by the diffuser. The diffuser may be configured to diffuse the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser by the diffuser being configured to perform one or more of reflection and transmission of the first beam of laser light and the second beam of laser light, respectively, that is incident on the diffuser.

[0013] The diffuser may be further configured to diffuse the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser by the diffuser further being configured to perform one or more of diffraction, refraction and scattering of the first beam of laser light and the second beam of laser light, respectively, that is incident on the diffuser.

[0014] By the device light comprising laser light which is produced by the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser and subsequently diffused by the diffuser, the light output from the laser lighting device may be safe for the naked eyes of a viewer or user (e.g., so that the light output from the laser lighting device is safe to view by a viewer or user with the viewer’s or user’s naked eyes without risk of damage to them). Thereby, the laser lighting device may be capable of providing eye-safe laser lighting.

[0015] As mentioned, the controller is configured to control operation of a first subset of the set of nl lasers and a second subset of the lasers individually. Further, the respective ones of the first subset of lasers and the second subset of lasers are arranged in relation to the at least one second optical element, or vice versa, such that the first beam of laser light and the second beam of laser light, respectively, directed by the at least one second optical element towards the diffuser has a center axis that is offset with respect to an optical axis between the at least one second optical element and the diffuser by a first offset and a second offset, respectively, with the second offset being different from the first offset. By such configurations, a beam shaping functionality of the laser lighting device may be provided. Another way to describe that the first beam of laser light, directed by the at least one second optical element towards the diffuser, has a center axis that is offset with respect to an optical axis between the at least one second optical element and the diffuser by a first offset, is that the laser light emitted by the first subset of the set of nl lasers may be projected onto the at least one second optical element (e.g., including at least one focusing lens) to off-axis (e.g., off-optical axis) focus the laser light onto the diffuser for shaping of the first beam of laser light from, e.g., a first angle. Another way to describe that the second beam of laser light, directed by the at least one second optical element towards the diffuser, has a center axis that is offset with respect to an optical axis between the at least one second optical element and the diffuser by a second offset, is that the laser light emitted by the second subset of the set of nl lasers may be projected onto the at least one second optical element to off-axis (e.g., off- optical axis) focus the laser light onto the diffuser for shaping of the second beam of laser light from, e.g., a second angle, which for example may be considered opposite to the first angle in relation to the optical axis. In this regard, the respective ones of the first subset of lasers and the second subset of lasers may be arranged in relation to the at least one second optical element, or vice versa, such that each of the first offset and the second offset is a spatial offset and / or an angular offset with respect to the optical axis between the at least one second optical element and the diffuser. Thus, by such above-described configurations, a functionality of the laser lighting device may be provided which can be used for controlling beam shape and / or beam size of light emitted by the laser lighting device.

[0016] Each or any of the different subsets of the set of nl lasers may include one or more lasers of the nl lasers.

[0017] The first subset of the set of nl lasers and the second subset of the set of nl lasers may be non-overlapping. In other words, none of the lasers in the first subset of the set of nl lasers may be among the lasers in the second subset of the set of nl lasers, and vice versa.

[0018] Alternatively, the first subset of the set of nl lasers and the second subset of the set of nl lasers may be partially overlapping. In other words, one or more lasers in the first subset of the set of nl lasers may be among the lasers in the second subset of the set of nl lasers, or vice versa. The set of nl lasers may be arranged over a surface of the laser lighting device which thereby may be considered as a laser light-emitting surface. A partial overlap between the first subset of the set of nl lasers and the second subset of the set of nl lasers may mean that an area of the laser light-emitting surface corresponding to the first subset of the set of nl lasers is overlapping with less than 30%, e.g., in a range from 5% to 30%, an area of the laser light-emitting surface corresponding to the second subset of the set of nl lasers, or vice versa. Such an overlap may be determined (e.g., calculated) for areas of the laser light-emitting surface for which the light intensity by the lasers in the areas is at least 50% of the maximum light intensity of a beam that would result from the entire set of nl lasers.

[0019] As mentioned, laser light source comprises a set of nl lasers, each of which is configured to, in operation, emit laser light, and the laser light source is configured such that the operation of at least different subsets of the set of nl lasers can be controlled individually. By means of the laser lighting device according to the first aspect of the present invention - such as by means of the particular arrangement of the set of nl lasers - different beam profiles of the device light may be achieved. For example, the device light may have a beam cross section that is circular, or substantially circular. The beam profile of the device light may depend at least in part on the arrangement of the set of nl lasers (e.g., including laser diodes). For example, the set of nl lasers could be arranged in a two-dimensional array such that the lasers, as seen from above the two-dimensional array, form a square or rectangular lattice, by means of which a beam cross section of the device light that is (e.g., substantially) square or rectangular may be achieved. According to another example, the set of nl lasers could be arranged in circular arrangement, by means of which a beam cross section of the device light that is (e.g., substantially) circular may be achieved. Other shapes of the beam cross section of the device light - such as by means of the particular arrangement of the set of nl lasers - are however possible.

[0020] The controller may be configured to control operation of the first subset of the set of nl lasers and the second subset of the set of nl lasers individually at least with respect to being switched on and off so as to emit laser light and not emit laser light, respectively, such that the first subset of the set of nl lasers and the second subset of the set of nl lasers can be switched on to emit laser light during different periods of time.

[0021] The center axis of a beam of laser light (e.g., the first beam of laser light or the second beam of laser light) for example as directed by the at least one second optical element towards the diffuser may in alternative be referred to as a beam axis. The beam power of the laser light beam may be principally concentrated within a small imaginary cylinder surrounding the beam axis or center axis of the laser light beam.

[0022] The at least one first optical element may for example comprise one or more lenses. For example, the at least one first optical element may comprise several lenses. Possibly, there may be provided one or more lenses of the at least one first optical element for each laser of the respective ones of the first subset of the set of nl lasers and / or the second subset of the set of nl lasers, or there may be provided one or more lenses of the at least one first optical element for each of the first subset of the set of nl lasers and the second subset of the set of nl lasers.

[0023] The laser lighting device may comprise a light-transmissive light exit module which may be configured to output the device light. The light-transmissive light exit module may be configured to transmit the laser light produced by the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser and subsequently diffused by the diffuser, wherein the laser light transmitted by the light-transmissive light exit module may comprise the device light.

[0024] The laser lighting device may be of a type similar to the type usually referred to as moving head light. The laser lighting device may comprise a base, an arm (or several arms) and a head. The base may in alternative be referred to as a stand. The head may comprise the light-transmissive light exit module, possibly such that the device light is emitted by the laser lighting device only from the head. The arm(s) and the head may be arranged to be movable in relation to the base and the base may be arranged to be stationary in relation to the arm(s) and the head. The arm(s) and the head may be rotatable about a vertical axis of the laser lighting device and possibly the head may be rotatable about a horizontal axis of the laser lighting device. Thereby, the light-transmissive light exit module may be pointed in different, selected directions in relation to the base. The said vertical axis of the laser lighting device may be or correspond to a longitudinal axis of the laser lighting device. The said horizontal axis of the laser lighting device may be or correspond to an axis that is (e.g., substantially) perpendicular to a (the) longitudinal axis of the laser lighting device.

[0025] The at least one second optical element may comprise at least one of an optical device configured to alter the polarization of light passing through it, a polarizing beam splitter, and at least one focusing lens. Possibly, the at least one second optical element may comprise a polarizing beam splitter, an optical device configured to alter the polarization of light passing through it, and at least one focusing lens, which may be arranged in that order along an optical axis of the at least one second optical element. As known in the art, a polarizing beam splitter is in general configured to split light by polarization state rather than by wavelength or intensity.

[0026] The diffuser may comprise a first light-reflective element, which may comprise a specular reflector and a refractive element. The refractive element may be arranged between the specular reflector and the at least one second optical element such that the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser is incident on the refractive element. Thus, the diffuser may be said to operate in a reflective mode. The specular reflector may be comprised in or constituted by a specularly reflective mirror, e.g., a metallic specularly reflective mirror. In such configurations, the diffuser may be configured to maintain polarization of light; e.g., such that the light diffused by the diffuser has the same polarization as the polarization of light being incident on the diffuser. In alternative or in addition, the diffuser may comprise a second light-reflective element, which may have a surface facing the at least one second optical element and having a plurality of surface relief structures. The diffuser may be configured such that the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser is incident on the second reflective element. At least some of the surface relief structures may be provided with a layer or coating of a specularly reflecting material. In such configurations, the diffuser may be configured to maintain polarization of light; e.g., such that the light diffused by the diffuser has the same polarization as the polarization of light being incident on the diffuser.

[0027] In alternative or in addition, the diffuser may comprise a light-transmissive element, which may have a surface facing the at least one second optical element and having a plurality of surface relief structures. The plurality of surface relief structures may be configured to refract light incident on the surface of the light-transmissive element. The diffuser may be configured such that the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser is incident on the surface of the light- transmissive element. Thus, the diffuser may be said to operate in a transmission mode. The plurality of surface relief structures may comprise or be based on one or more holographic structures.

[0028] A diffuser comprising a first light-reflective element, a second light-reflective element and / or a light-transmissive element such as described in the foregoing may be advantageous in comparison to conventional diffusers by being able to provide a limited (e.g., at most 20 degrees) and controlled (e.g., square beam pattern) divergence of light being incident on the diffuser and subsequently diffused by the diffuser. In an embodiment, the diffuser is configured to diffuse the first beam of laser light and the second beam of laser light at most 50 degrees, preferably at most 30 degrees, more preferably at most 20 degrees, such as at most 10 degrees. In embodiment, the diffuser is configured to diffuse the first beam of laser light and the second beam of laser light in the range of 5 degrees to 50 degrees, preferably in the range of 10 degrees to 40 degrees, more preferably in the range of 10 degrees to 30 degrees, such as in the range of 15 degrees to 25 degrees. In an embodiment, the diffuser is configured to diffuse the first beam of laser light and the second beam of laser light at least 50 degrees, preferably at least 30 degrees, more preferably at least 20 degrees, such as at least 10 degrees. The set of nl lasers may be constituted as a two-dimensional array of lasers, e.g., as a laser bank.

[0029] The laser lighting device (e.g., the laser light source, the at least one first optical component and / or the at least one second optical component) may be configured such that the device light is or comprises white light, or in other words light in a white wavelength range, and / or have a correlated color temperature in a range from 2000 K to 12000 K, and / or possibly have a color rendering index of at least 65, preferably at least 80 or at least 90. Such light may provide a white light quality that may be particularly tailored for (e.g., optimal for) entertainment lighting.

[0030] The controller may be further configured to control operation of one or more additional subsets of the nl lasers individually, wherein the laser light emitted by the respective ones of such additional subset(s) of the nl lasers is processed in a way similarly and corresponding to the processing of the laser light emitted by the respective ones of the first subset of the set of nl lasers and the second subset of the lasers as described herein, e.g., such as described in the foregoing.

[0031] For example, according to one or more embodiments of the present invention, nl > 9, and the controller may be further configured to control operation of at least a third subset of the set of nl lasers, a fourth subset of the set of nl lasers, a fifth subset of the set of nl lasers, a sixth subset of the set of nl lasers, a seventh subset of the set of nl lasers, an eighth subset of the set of nl lasers, and a ninth subset of the set of nl lasers individually. Each of the first to ninth subsets of the set of nl lasers may be different from the other ones of the first to ninth subsets of the set of nl lasers. The at least one first optical element may be further configured to collimate the laser light emitted by the respective ones of the third to ninth subsets of the set of nl lasers to produce a third beam of laser light, a fourth beam of laser light, a fifth beam of laser light, a sixth beam of laser light, a seventh beam of laser light, an eighth beam of laser light and a ninth beam of laser light, respectively. The at least one second optical element may be further configured to direct the respective ones of the third to ninth beams of laser light toward the diffuser. The respective ones of the third to ninth subsets of lasers may be arranged in relation to the at least one second optical element, or vice versa, such that the respective ones of the third to ninth beams of laser light, directed by the at least one second optical element toward the diffuser have respective center axes that are offset with respect to the optical axis between the at least one second optical element and the diffuser by a third offset, a fourth offset, a fifth offset, a sixth offset, a seventh offset, an eighth offset and a ninth offset, respectively, wherein each of the first to ninth offsets is different from the other ones of the first to ninth offsets. The device light may further comprise laser light produced by the respective ones of the third to ninth beams of laser light being incident on the diffuser and subsequently diffused by the diffuser. The diffuser may be further configured to diffuse the respective ones of the third to ninth beams of laser light being incident on the diffuser by the diffuser being configured to perform one or more of reflection and transmission (and possibly one or more of diffraction, refraction and scattering) of the respective ones of the third to ninth beams of laser light that are incident on the diffuser.

[0032] Each or any of the different subsets of the set of nl lasers may comprise (i) one or more laser diodes configured to emit red light (which might be referred to as “red laser diode(s)”), (ii) one or more laser diodes configured to emit green light (which might be referred to as “green laser diode(s)”) and / or (iii) one or more laser diodes configured to emit blue light (which might be referred to as “blue laser diode(s)”).

[0033] In alternative or in addition, each or any of the different subsets of the set of nl lasers may comprise one or more laser diodes configured to emit violet light, one or more laser diodes configured to emit yellow light, one or more laser diodes configured to emit orange light, one or more laser diodes configured to emit pink light, one or more laser diodes configured to emit cyan light, and / or one or more laser diodes configured to emit amber light.

[0034] The terms “violet light” or “violet emission” especially relates to light having a wavelength in the range of about 380-440 nm. The terms “blue light” or “blue emission” especially relates to light having a wavelength in the range of about 440-495 nm (including some violet and cyan hues). The terms “green light” or “green emission” especially relate to light having a wavelength in the range of about 495-570 nm. The terms “yellow light” or “yellow emission” especially relate to light having a wavelength in the range of about 570- 590 nm. The terms “orange light” or “orange emission” especially relate to light having a wavelength in the range of about 590-620 nm. The terms “red light” or “red emission” especially relate to light having a wavelength in the range of about 620-780 nm. The term “pink light” or “pink emission” refers to light having a blue and a red component. The term “cyan light” or “cyan emission” may relate to light having one or more wavelengths selected from the range of about 490-520 nm. The term “amber light” or “amber emission” may refer to light having one or more wavelengths selected from the range of about 585-605 nm, such as about 590-600 nm. By a white wavelength range, it may be meant a wavelength range from (e.g., about) 400 nm to (e.g., about) 700 nm. As already indicated in the foregoing, the laser light source may be a laser bank. The laser bank may be configured to be in thermal contact with a first thermally conductive body (or simply thermally conductive body) or comprise the first thermally conductive body. The first thermally conductive body may be comprised in the laser lighting device. The first thermally conductive body may be configured to transfer thermal energy away from the laser bank. The first thermally conductive body may for example comprise one or more heatsinks and / or one or more heat spreaders.

[0035] According to a second aspect of the present invention, a lighting system is provided. The lighting system comprises at least one laser lighting device according to the first aspect of the present invention. The lighting system may be selected from the group of a lamp, a luminaire, a projector device, and an automotive lighting device.

[0036] The controller may for example include or be constituted by any suitable central processing unit (CPU), microcontroller, digital signal processor (DSP), Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA), etc., or any combination thereof. The controller may optionally be capable of executing software instructions stored in a computer program product, e.g., in the form of a memory. The memory may for example be any combination of read and write memory (RAM) and read only memory (ROM). The memory may comprise persistent storage, which for example can be a magnetic memory, an optical memory, a solid-state memory or a remotely mounted memory, or any combination thereof.

[0037] Further objects and advantages of the present invention are described in the following by means of exemplifying embodiments. It is noted that the present invention relates to all possible combinations of features recited in the claims. Further features of, and advantages with, the present invention will become apparent when studying the appended claims and the description herein. Those skilled in the art realize that different features of the present invention can be combined to create embodiments other than those described herein.

[0038] BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Exemplifying embodiments of the invention will be described below with reference to the accompanying drawings.

[0040] Fig. 1 is a schematic view of a laser lighting device according to an embodiment of the present invention. Fig. 2 is a schematic view of a part of a laser lighting device according to an embodiment of the present invention.

[0041] Fig. 3 is a schematic view of a laser lighting device according to an embodiment of the present invention.

[0042] Fig. 4 is a schematic view of a part of a laser lighting device according to an embodiment of the present invention.

[0043] Figs. 5, 6 and 7 are schematic views of a diffuser in accordance with respective embodiments of the present invention.

[0044] Fig. 8 is a perspective view of a laser lighting device according to an embodiment of the present invention.

[0045] Fig. 9 is a perspective view of a laser bank in accordance with an embodiment of the present invention.

[0046] All the figures are schematic, not necessarily to scale, and generally only show parts which are necessary in order to elucidate embodiments of the present invention, wherein other parts may be omitted or merely suggested.

[0047] DESCRIPTION WITH REFERENCE TO THE DRAWINGS

[0048] The present invention will now be described hereinafter with reference to the accompanying drawings, in which exemplifying embodiments of the present invention are shown. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments of the present invention set forth herein; rather, these embodiments of the present invention are provided by way of example so that this disclosure will convey the scope of the invention to those skilled in the art. In the drawings, identical reference numerals denote the same or similar components having a same or similar function, unless specifically stated otherwise.

[0049] Figure 1 is a schematic view of a laser lighting device 1 according to an embodiment of the present invention. The laser lighting device 1 is configured to, in operation, emit device light.

[0050] The laser lighting device 1 comprises a laser light source, schematically indicated at 2 in Figure 1. The laser light source 2 comprises a set of nl lasers, wherein nl>2. Some of the lasers of the set of nl lasers are indicated by the elements referenced by numerals 3, 4, 5 and 6 in Figure 1. It is to be understood that the number of lasers illustrated in Figure 1 is according to an example, and that the laser light source 2 might include fewer or more lasers than illustrated in Figure 1. The set of nl lasers may in the following be referred to as the set of nl lasers 3, 4, 5, 6 without any loss of generality. Each laser of the set of nl lasers 3,

[0051] 4, 5, 6 is configured to, in operation, emit laser light.

[0052] In accordance with the embodiment of the present invention illustrated in Figure 1, the set of lasers of the laser light source 2 is constituted as a two-dimensional array of lasers, e.g., in the form of a laser bank. Further in accordance with the embodiment of the present invention illustrated in Figure 1, the laser light source 2 or laser bank may be configured to be in thermal contact with a (e.g., a first) thermally conductive body, schematically indicated at 19 in Figure 1. The thermally conductive body 19 may be comprised in the laser lighting device 1. For example, the laser light source 2 or laser bank might comprise the first thermally conductive body 19. The thermally conductive body 19 may be configured to transfer thermal energy away from the laser light source 2 or laser bank. The thermally conductive body 19 may for example comprise one or more heatsinks and / or one or more heat spreaders.

[0053] The laser light source 2 is configured such that the operation of at least different subsets of the set of nl lasers 3, 4, 5, 6 can be controlled individually. In accordance with the embodiment of the present invention illustrated in Figure 1, there is a first subset 7 of the set of nl lasers 3, 4, 5, 6 and a second subset 8 of the set of nl lasers 3, 4, 5, 6, wherein the second subset 8 of the set of nl lasers 3, 4, 5, 6 is different from the first subset 7 of the set of nl lasers 3, 4, 5, 6. Operation of the first subset 7 of the set of nl lasers 3, 4, 5, 6 and the second subset 8 of the set of nl lasers 3, 4, 5, 6 can be controlled individually. That is, control of operation of the first subset 7 of the set of nl lasers 3, 4, 5 may be independent from control of operation of the second subset 8 of the set of nl lasers 3, 4, 5, 6. It is to be understood that the number of lasers in each of the first subset 7 of the set of nl lasers 3, 4, 5, 6 and the number of lasers in the second subset 8 of the set of nl lasers are according to an example, and that the number of lasers in each of the first subset 7 of the set of nl lasers 3, 4,

[0054] 5, 6 and the number of lasers in the second subset 8 of the set of nl lasers, respectively, could be smaller or larger than illustrated in Figure 1. In other words, the partitioning of the set of nl lasers 3, 4, 5, 6 into the first subset 7 of the set of nl lasers 3, 4, 5, 6 and the second subset 8 of the set of nl lasers 3, 4, 5, 6 is not limited to the case illustrated in Figure 1, for which the first subset 7 of the set of nl lasers 3, 4, 5, 6 includes fifteen lasers and the second subset 8 of the set of nl lasers 3, 4, 5, 6 includes ten lasers, but the partitioning could be different (e.g., the first and second subsets of lasers could include fewer or more lasers, there could be more than two subsets of lasers which may be controlled individually, etc.).

[0055] The laser lighting device 1 comprises a controller 10. The controller 10 is configured to control operation of the different subsets 7, 8 of the lasers individually. In accordance with the embodiment of the present invention illustrated in Figure 1, the controller 10 is configured to control operation of the first subset 7 of the set of nl lasers 3, 4, 5, 6 and the second subset 8 of the set of nl lasers 3, 4, 5, 6 individually. As illustrated in Figure 1, the controller 10 may be connected with laser light source 2 for carrying out the controlling of the operation of the different subsets 7, 8 of the lasers individually. While a wired connection between the controller 10 and the laser light source 2 is indicated in Figure 1, it is to be understood that connection between the controller 10 and the laser light source 2 may be wired and / or wireless in order to permit the controller 10 to carry out, e.g., the controlling of the operation of the different subsets 7, 8 of the lasers individually. Such wired and / or wireless connection may for example be realized using any appropriate wired and / or wireless communicative connection or coupling as known in the art.

[0056] The controller 10 may be configured to control operation of the first subset 7 of the set of nl lasers 3, 4, 5, 6 and the second subset 8 of the set of nl lasers 3, 4, 5, 6 individually at least with respect to being switched on and off so as to emit laser light and not emit laser light, respectively. Thereby, the first subset 7 of the set of nl lasers 3, 4, 5, 6 and the second subset 8 of the set of nl lasers 3, 4, 5, 6 may be switched on to emit laser light during different periods of time.

[0057] The laser lighting device 1 comprises at least one first optical element 11, which is configured to collimate the laser light emitted by the respective ones of the first subset 7 of the set of nl lasers 3, 4, 5, 6 and the second subset 8 of the set of nl lasers 3, 4, 5, 6 to produce a first beam of laser light and a second beam of laser light, respectively.

[0058] Figure 1 illustrates a case where the controller 10 controls operation of the first subset 7 of the set of nl lasers 3, 4, 5, 6 to emit laser light and controls operation of the second subset 8 of the set of nl lasers 3, 4, 5, 6 to not emit laser light. Thereby, Figure 1 illustrates a first beam of laser light (immediately to the right of the first optical element 11) that is produced by collimation carried out by the at least one first optical element 11 of the laser light emitted by the first subset 7 of the set of nl lasers 3, 4, 5, 6, while the second beam of laser light is not illustrated in Figure 1. The laser lighting device 1 comprises a diffuser 15 and at least one second optical element configured to direct the first beam of laser light and the second beam of laser light, respectively, towards the diffuser 15.

[0059] For the case illustrated in Figure 1 where the controller 10 controls operation of the first subset 7 of the set of nl lasers 3, 4, 5, 6 to emit laser light and controls operation of the second subset 8 of the set of nl lasers 3, 4, 5, 6 to not emit laser light, Figure 1 further illustrates the first beam of laser light being directed towards the diffuser 15 by the at least one second optical element, while the second beam of laser light directed towards the diffuser 15 is not illustrated in Figure 1.

[0060] In accordance with the embodiment of the present invention illustrated in Figure 1, the at least one second optical element, which in the following may be referred to as the at least one second optical element 12, 13, 14 without any loss of generality, comprises several components 12, 13 and 14 configured to direct the first beam of laser light and the second beam of laser light, respectively, towards the diffuser 15. Specifically - and further in accordance with the embodiment of the present invention illustrated in Figure 1 - the at least one second optical element 12, 13, 14 comprises a polarizing beam splitter 12, an optical device 13 configured to alter the polarization of light passing through it, and at least one focusing lens 14, with the polarizing beam splitter 12, the optical device 13 and the at least one focusing lens 14 arranged in that order along an optical axis of the at least one second optical element 12, 13, 14.

[0061] The respective ones of the first subset 7 of lasers and the second subset 8 of lasers are arranged in relation to the at least one second optical element 12, 13, 14, or vice versa, such that the first beam of laser light and the second beam of laser light, respectively, directed by the at least one second optical element 12, 13, 14 towards the diffuser 15 has a center axis that is offset with respect to an optical axis OA between the at least one second optical element 12, 13, 14 and the diffuser 15 (or more generally an optical axis of the laser lighting device 1) by a first offset and a second offset, respectively, wherein the second offset is different from the first offset.

[0062] Figure 1 further illustrates the first beam of laser light being directed towards the diffuser 15 by the at least one second optical element 12, 13, 14, while the second beam of laser light directed towards the diffuser 15 is not illustrated in Figure 1. As shown in Figure 1, the first beam of laser light has a center axis (which in alternative may be referred to as a beam axis) that is offset with respect to the optical axis OA. Turning now to Figure 3, that figure is a schematic view of a laser lighting device 1 according to an embodiment of the present invention. The laser lighting device 1 illustrated in Figure 3 is similar to the laser lighting device 1 illustrated in Figure 1, and the same reference numerals in Figures 1 and 3 denote the same or similar components, having the same or similar function. Just as the laser lighting device 1 illustrated in Figure 1, the laser lighting device 1 illustrated in Figure 3 comprises a laser light source 2 comprising a set of nl lasers, some of which are indicated by the elements referenced by numerals 3, 4, 5 and 6 in Figure 3. However, compared to the laser lighting device 1 illustrated in Figure 1, in the laser lighting device 1 illustrated in Figure 3 the partitioning of the set of nl lasers 3, 4, 5, 6 into different subsets 7 of the set of nl lasers 3, 4, 5, 6 is different. In the laser lighting device 1 illustrated in Figure 3, there is a first subset 17 of the set of nl lasers 3, 4, 5, 6 and a second subset 18 of the set of nl lasers 3, 4, 5, 6. While the first subset 17 of the set of nl lasers 3, 4, 5, 6 illustrated in Figure 3 includes the same number of lasers as the first subset 7 of the set of nl lasers 3, 4, 5, 6 illustrated in Figure 1, the first subset 17 of the set of nl lasers 3, 4, 5, 6 illustrated in Figure 3 is different from the first subset 7 of the set of nl lasers 3, 4, 5, 6.

[0063] Figure 3 illustrates a case where the controller 10 controls operation of the first subset 17 of the set of nl lasers 3, 4, 5, 6 to emit laser light and controls operation of the second subset 18 of the set of nl lasers 3, 4, 5, 6 to not emit laser light. Thereby, Figure 3 illustrates a first beam of laser light (immediately to the right of the first optical element 11) that is produced by collimation carried out by the at least one first optical element 11 of the laser light emitted by the first subset 17 of the set of nl lasers 3, 4, 5, 6, while the second beam of laser light is not illustrated in Figure 1. Figure 3 further illustrates the first beam of laser light being directed towards the diffuser 15 by the at least one second optical element 12, 13, 14, while the second beam of laser light directed towards the diffuser 15 is not illustrated in Figure 3. As shown in Figure 3, the first beam of laser light has a center axis (which in alternative may be referred to as a beam axis) that is offset with respect to the optical axis OA.

[0064] As indicated in Figures 1 and 3 based upon a comparison of them, by the first subset 17 of the set of nl lasers 3, 4, 5, 6 illustrated in Figure 3 being different from the first subset 7 of the set of nl lasers 3, 4, 5, 6 illustrated in Figure 1, the first beams of laser light illustrated in the respective ones of Figures 1 and 3 have center axes having different offsets with respect to the optical axis OA.

[0065] Similarly, while not illustrated in Figures 1 and 3, by virtue of the first subset 17 of the set of nl lasers 3, 4, 5, 6 illustrated in Figure 3 being different from the second subset 18 of the set of nl lasers 3, 4, 5, 6 illustrated in Figure 3 and the first subset 7 of the set of nl lasers 3, 4, 5, 6 illustrated in Figure 1 being different from the second subset 8 of the set of nl lasers 3, 4, 5, 6 illustrated in Figure 1, the center axes of the second beams of laser light will be offset with respect to the optical axis OA with offsets that are different from the offsets of the center axes of the first beams of laser light illustrated in the respective ones of Figures 1 and 3.

[0066] The device light emitted by the laser lighting device 1 comprises at least laser light produced by the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser 15 and subsequently diffused by the diffuser 15. The diffuser 15 is configured to diffuse the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser 15 by the diffuser 15 being configured to perform one or more of reflection and transmission of the first beam of laser light and the second beam of laser light, respectively, that is incident on the diffuser 15.

[0067] Figures 2 and 4 are schematic views of a part of a laser lighting device 1 according to embodiments of the present invention. Specifically, Figures 2 and 4 show the at least one second optical element 12, 13, 14 and the diffuser 15 in the laser lighting devices 1 in Figures 1 and 3, respectively, and illustrate the device light 16 emitted by the laser lighting devices 1 in Figures 1 and 3, respectively, as comprising laser light produced by the first beam of laser light being incident on the diffuser 15 and subsequently diffused by the diffuser 15. In accordance with the embodiments of the present invention illustrated in Figures 2 and 4, the diffuser 15 is configured to diffuse the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser 15 by the diffuser 15 being configured to perform at least reflection of the first beam of laser light and the second beam of laser light, respectively, that is incident on the diffuser 15. Thus, in accordance with the embodiments of the present invention illustrated in Figures 2 and 4, the diffuser 15 may be said to operate in a reflective mode. However, as described elsewhere herein, the diffuser 15 could, in alternative or in addition, be operating in a transmission mode.

[0068] As illustrated in Figures 2 and 4, the device light 16 comprises the laser light produced by the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser 15 and subsequently diffused by the diffuser 15 by the diffuser 15 being configured to perform at least reflection of the first beam of laser light and the second beam of laser light, respectively, that is incident on the diffuser 15, and is a beam of laser light passing the at least one focusing lens 14, the optical device 13 and the polarizing beam splitter 12, in that order along the optical axis OA and having a center axis that is offset from the optical axis OA. By the first subset 17 of the set of nl lasers 3, 4, 5, 6 illustrated in Figure 3 being different from the first subset 7 of the set of nl lasers 3, 4, 5, 6, the center axes of the device light 16 of the laser lighting devices 1 illustrated in Figures 2 and 4 have different offsets with respect to the optical axis OA.

[0069] Figure 5 is a schematic view of a diffuser in accordance with an embodiment of the present invention. The diffuser illustrated in Figure 5 may be particularly relevant for the case where the diffuser may be said to operate in a reflective mode. The illustrated diffuser comprises a first light-reflective element 41, which comprises a specular reflector 31 and a refractive element 32. The refractive element 32 is arranged between the specular reflector 31 and the at least one second optical element (not shown in Figure 5; cf. Figures 1 to 4) such that the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser is incident on the refractive element 32.

[0070] Figure 6 is a schematic view of a diffuser in accordance with another embodiment of the present invention. Just as the diffuser illustrated in Figure 5, the diffuser illustrated in Figure 6 may also be particularly relevant for the case where the diffuser may be said to operate in a reflective mode. The diffuser illustrated in Figure 6 comprises a second light-reflective element 42 having a surface 36 facing the at least one second optical element (not shown in Figure 6; cf. Figures 1 to 4) and having a plurality of surface relief structures 33. The diffuser is configured such that the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser is incident on the second reflective element 32. At least some of the surface relief structures 33 are provided with a layer or coating 34 of a specularly reflecting material.

[0071] Figure 7 is a schematic view of a diffuser in accordance with yet another embodiment of the present invention. The diffuser illustrated in Figure 7 may be particularly relevant for the case where the diffuser may be said to operate in a transmission mode. The illustrated diffuser comprises a light-transmissive element 43 having a surface 37 facing the at least one second optical element (not shown in Figure 7; cf. Figures 1 to 4) and having a plurality of surface relief structures 35 configured to refract light incident on the surface 37 of the light-transmissive element 43. The diffuser is configured such that the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser is incident on the surface 37 of the light-transmissive element 43. The plurality of surface relief structures 35 may comprise or be based on one or more holographic structures. Figure 8 is a perspective view of a laser lighting device 1 according to an embodiment of the present invention. The laser lighting device 1 may generally be of a type similar to the type usually referred to as moving head light.

[0072] The laser lighting device 1 illustrated in Figure 8 comprises a base 20, an arm 21 (or possibly several arms) and ahead 22. The laser lighting device 1 illustrated in Figure 8 may be generally be configured similarly or in the same way as described herein for example with reference to any of Figures 1 to 7. Any components of the laser lighting device 1 such as each or any of the components illustrated in any of Figures 1 to 7 (not shown in Figure 8) may be arranged within the base 20, e.g., within an interior, enclosed space which may be comprised in the base 20.

[0073] The laser lighting device 1 illustrated in Figure 8 comprises a light- transmissive light exit module 23 which may be configured to output the device light. The light-transmissive light exit module 23 may be configured to transmit the laser light produced by the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser (not shown in Figure 8) and subsequently diffused by the diffuser, wherein the laser light transmitted by the light-transmissive light exit module 23 may comprise the device light.

[0074] In accordance with the embodiment of the present invention illustrated in Figure 8, the head 22 may comprise the light-transmissive light exit module 23, possibly such that the device light is emitted by the laser lighting device 1 only from the head 22. The arm(s) 21 and the head 22 may be arranged to be movable in relation to the base 20 and the base 20 may be arranged to be stationary in relation to the arm(s) 21 and the head 22. The arm(s) 21 and the head 22 may be rotatable about a vertical axis Z of the laser lighting device 1 and possibly the head 22 may be rotatable about a horizontal axis Y of the laser lighting device 1. Thereby, the light-transmissive light exit module 23 may be pointed in different, selected directions in relation to the base 20. The said vertical axis Z of the laser lighting device 1 may be or correspond to a longitudinal axis of the laser lighting device 1. The said horizontal axis Y of the laser lighting device 1 may be or correspond to an axis that is (e.g., substantially) perpendicular to a (the) longitudinal axis of the laser lighting device 1.

[0075] As indicated in the foregoing such as with reference to the embodiment of the present invention illustrated in Figure 1, the laser light source may be laser bank. Figure 9 is a perspective view of a laser bank 25 in accordance with an embodiment of the present invention, with the laser bank 25 including a set of nl lasers, e.g., in the form of laser diodes, some of which are indicated by the elements referenced by numerals 3, 4, 5 and 6 in Figure 9. The set of nl lasers or laser diodes may in the following be referred to as the set of nl lasers or laser diodes 3, 4, 5, 6 without any loss of generality. It is to be understood that the number of lasers or laser diodes illustrated in Figure 9 is according to an example, and that the laser bank 25 might include fewer or more lasers or laser diodes than illustrated in Figure 9. In accordance with the embodiment of the present invention illustrated in Figure 9, the set of nl lasers or laser diodes 3, 4, 5, 6 is arranged in a two-dimensional array on one side of the laser bank 25. It is however to be understood that the geometrical arrangement of the set of nl lasers or laser diodes 3, 4, 5, 6 illustrated in Figure 9 is according to an example and that variations are possible. For example, the set of nl lasers or laser diodes 3, 4, 5, 6 could be arranged in a circular arrangement. By such different geometrical arrangements of the set of nl lasers or laser diodes 3, 4, 5, 6, the device light may have different beam cross sections. For example, if the set of nl lasers or laser diodes 3, 4, 5, 6 would be arranged in a circular arrangement, the device light may have a beam cross section that is circular, or substantially circular.

[0076] In conclusion, a laser lighting device is disclosed, comprising a laser light source comprising a set of nl>2 lasers and configured such that the operation of at least different subsets of lasers can be controlled individually. At least one first optical element is configured to collimate the laser light emitted by the respective ones of a first subset of lasers and a second subset of lasers to produce a first beam of laser light and a second beam of laser light, respectively. At least one second optical element is configured to direct the first beam of laser light and the second beam of laser light, respectively, towards a diffuser. The laser lighting device is configured such that the first beam of laser light and the second beam of laser light, respectively, directed by the at least one second optical element towards the diffuser has a center axis that is offset with respect to an optical axis between the at least one second optical element and the diffuser by a first offset and a second offset, respectively, wherein the second offset is different from the first offset.

[0077] While the present invention has been illustrated in the appended drawings and the foregoing description, such illustration is to be considered illustrative or exemplifying and not restrictive; the present invention is not limited to the disclosed embodiments. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the appended claims, the word “comprising” does not exclude other elements or steps, and the indefinite article ”a” or “an” does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope.

Claims

CLAIMS1. A laser lighting device (1) configured to, in operation, emit device light (16), the laser lighting device comprising: a laser light source (2) comprising a set of nl lasers (3, 4, 5, 6) each of which is configured to, in operation, emit laser light, the laser light source being configured such that the operation of at least different subsets (7, 8; 17, 18) of the set of nl lasers can be controlled individually, wherein nl>2; a controller (10) configured to control operation of the different subsets of the lasers individually, wherein the controller is configured to control operation of a first subset (7; 17) of the set of nl lasers and a second subset (8; 18) of the set of nl lasers individually, wherein the second subset of the set of nl lasers is different from the first subset of the set of nl lasers; at least one first optical element (11) configured to collimate the laser light emitted by the respective ones of the first subset of the set of nl lasers and the second subset of the set of nl lasers to produce a first beam of laser light and a second beam of laser light, respectively; a diffuser (15); and at least one second optical element (12, 13, 14) configured to direct the first beam of laser light and the second beam of laser light, respectively, towards the diffuser; wherein the respective ones of the first subset of lasers and the second subset of lasers are arranged in relation to the at least one second optical element, or vice versa, such that the first beam of laser light and the second beam of laser light, respectively, directed by the at least one second optical element towards the diffuser has a center axis that is offset with respect to an optical axis (OA) between the at least one second optical element and the diffuser by a first offset and a second offset, respectively, wherein the second offset is different from the first offset, wherein the device light comprises at least laser light produced by the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser and subsequently diffused by the diffuser, wherein the diffuser is configured to diffuse the first beam of laser light and the second beam of laser light, respectively, beingincident on the diffuser by the diffuser being configured to perform one or more of reflection and transmission of the first beam of laser light and the second beam of laser light, respectively, that is incident on the diffuser, and wherein the device light is white light having a correlated color temperature in a range from 2000 K to 12000 K and a color rendering index of at least 65.

2. A laser lighting device according to claim 1, wherein the diffuser is further configured to diffuse the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser by the diffuser further being configured to perform one or more of diffraction, refraction and scattering of the first beam of laser light and the second beam of laser light, respectively, that is incident on the diffuser.

3. A laser lighting device according to any one of claims 1-2, wherein the respective ones of the first subset of lasers and the second subset of lasers are arranged in relation to the at least one second optical element, or vice versa, such that each of the first offset and the second offset is a spatial offset and / or an angular offset with respect to the optical axis between the at least one second optical element and the diffuser.

4. A laser lighting device according to any one of claims 1-3, wherein the at least one second optical element comprises at least one of an optical device (13) configured to alter the polarization of light passing through it, a polarizing beam splitter (12), and at least one focusing lens (14).

5. A laser lighting device according to any one of claims 1-4, wherein the at least one second optical element comprises a polarizing beam splitter (12), an optical device (13) configured to alter the polarization of light passing through it, and at least one focusing lens (14) arranged in that order along an optical axis of the at least one second optical element.

6. A laser lighting device according to any one of claims 1-5, wherein the diffuser comprises a first light-reflective element (41) comprising a specular reflector (31) and a refractive element (32), wherein the refractive element is arranged between the specular reflector and the at least one second optical element such that the first beam of laser light andthe second beam of laser light, respectively, being incident on the diffuser is incident on the refractive element.

7. A laser lighting device according to any one of claims 1-6, wherein the diffuser comprises a second light-reflective element (42) having a surface (36) facing the at least one second optical element and having a plurality of surface relief structures (33), wherein the diffuser is configured such that the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser is incident on the second reflective element, wherein at least some of the surface relief structures are provided with a layer or coating (34) of a specularly reflecting material.

8. A laser lighting device according to any one of claims 1-7, wherein the diffuser comprises a light-transmissive element (43) having a surface (37) facing the at least one second optical element and having a plurality of surface relief structures (35) configured to refract light incident on the surface of the light-transmissive element, wherein the diffuser is configured such that the first beam of laser light and the second beam of laser light, respectively, being incident on the diffuser is incident on the surface of the light-transmissive element.

9. A laser lighting device according to any one of claims 1-8, wherein the controller is configured to control operation of the first subset (7; 17) of the set of nl lasers and the second subset (8; 18) of the set of nl lasers individually at least with respect to being switched on and off so as to emit laser light and not emit laser light, respectively, such that the first subset of the set of nl lasers and the second subset of the set of nl lasers can be switched on to emit laser light during different periods of time.

10. A laser lighting device according to any one of claims 1-9, wherein the set of lasers is constituted as a two-dimensional array of lasers.

11. A laser lighting device according to any one of claims 1-10, wherein nl>9, and wherein the controller is further configured to control operation of at least a third subset of the set of nl lasers, a fourth subset of the set of nl lasers, a fifth subset of the set of nl lasers, a sixth subset of the set of nl lasers, a seventh subset of the set of nl lasers, an eighth subset ofthe set of nl lasers, and a ninth subset of the set of nl lasers individually, wherein each of the first to ninth subsets of the set of nl lasers is different from the other ones of the first to ninth subsets of the set of nl lasers; wherein the at least one first optical element is further configured to collimate the laser light emitted by the respective ones of the third to ninth subsets of the set of nl lasers to produce a third beam of laser light, a fourth beam of laser light, a fifth beam of laser light, a sixth beam of laser light, a seventh beam of laser light, an eighth beam of laser light and a ninth beam of laser light, respectively; wherein the at least one second optical element is further configured to direct the respective ones of the third to ninth beams of laser light toward the diffuser; wherein the respective ones of the third to ninth subsets of lasers are arranged in relation to the at least one second optical element, or vice versa, such that the respective ones of the third to ninth beams of laser light, directed by the at least one second optical element toward the diffuser have respective center axes that are offset with respect to the optical axis between the at least one second optical element and the diffuser by a third offset, a fourth offset, a fifth offset, a sixth offset, a seventh offset, an eighth offset and a ninth offset, respectively, wherein each of the first to ninth offsets is different from the other ones of the first to ninth offsets, and wherein the device light further comprises laser light produced by the respective ones of the third to ninth beams of laser light being incident on the diffuser and subsequently diffused by the diffuser, wherein the diffuser is further configured to diffuse the respective ones of the third to ninth beams of laser light being incident on the diffuser by the diffuser being configured to perform one or more of reflection and transmission of the respective ones of the third to ninth beams of laser light that are incident on the diffuser.

12. A laser lighting device according to any one of claims 1-10, wherein: the first subset of the set of nl lasers and the second subset of the set of nl lasers are non-overlapping; or the first subset of the set of nl lasers and the second subset of the set of nl lasers are partially overlapping.

13. A laser lighting device according to any one of claims 1-12, wherein the laser light source is a laser bank (25), wherein the laser bank is configured to be in thermal contactwith a first thermally conductive body (19) or comprises the first thermally conductive body (19), wherein the first thermally conductive body is configured to transfer thermal energy away from the laser bank.

14. A laser lighting device according to any one of claims 1-13, wherein each of the different subsets of the set of nl lasers comprises (i) one or more laser diodes configured to emit red light, (ii) one or more laser diodes configured to emit green light and (iii) one or more laser diodes configured to emit blue light.

15. A lighting system selected from the group of a lamp, a luminaire, a projector device, and an automotive lighting device, the lighting system comprising a laser lighting device (1) according to any one of the preceding claims.

Images