A light generating system

Abstract

A light generating system (100) configured to, in operation, emit system light (2), and comprising a solid state light source (3) configured to, in operation, emit light source light (4), a beam splitting element (7) being reflective for at least a first part (41) of the light source light, a polarization maintaining diffusing element (8) being arranged downstream of the beam splitting element (7) and being configured to receive and diffuse at least the first part (41) of the light source light into diffuse light (9), a first polarization rotator element (10) being configured to rotate the polarization of the diffuse light (9) to provide polarization rotated diffuse light (11), and a luminescent element (5). The beam splitting element (7) is transmissive for the polarization rotated diffuse light (11). An optical arrangement (15) is arranged downstream of the beam splitting element (7), and is configured to receive, reflect and rotate the polarization of at least a part of the polarization rotated diffuse light (11) to form reflected polarization rotated diffuse light (16). The luminescent element (5) is configured to receive and convert at least part of the reflected polarization rotated diffuse light (16) into first converted light (17). The beam splitting element (7) is further reflective for the reflected polarization rotated diffuse light (16) and reflective for the first converted light (17). The optical arrangement (15) is configured to transmit at least part of the first converted light (17). The system light (2) comprises at least the first converted light (17).

Description

[0001] 2024PF80358

[0002] A light generating system

[0003] FIELD OF THE INVENTION

[0004] The invention relates to a light generating system comprising a first solid state light source bank providing first solid state light source light. The invention further relates to a lighting fixture comprising such a light generating system.

[0005] As used herein, the term “blue light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 420 nm to 490 nm.

[0006] As used herein, the term “green-yellow light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 500 nm to 585 nm.

[0007] As used herein, the term “green light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 500 nm to 550 nm.

[0008] As used herein, the term “yellow light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 550 nm to 585 nm.

[0009] As used herein, the term “yellow-orange light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 550 nm to 600 nm.

[0010] As used herein, the term “cool white light” is intended to refer to light with color temperature falling within the color temperature interval of 3500 K to 4500 K.

[0011] As used herein, the terms “upstream” and “downstream” are intended to be understood relative to the direction of propagation of light through the light generating system. In other words, when a first component or feature is arranged “downstream” of a second component or feature, it may be understood that the first component or feature is arranged in a light receiving relationship with the second component or feature.

[0012] As used herein, the term “solid state light source” is intended to refer to any solid state light source, including LEDs, and especially diode lasers, super-luminescent diodes, multi -junction diodes and a diode array, comprising one or more LEDs.

[0013] BACKGROUND OF THE INVENTION

[0014] Laser-phosphor lighting is used in high-brightness applications such as projection, stage-lighting, search lights and automotive head lights. 2024PF80358

[0015] 2

[0016] CN 112413428 A discloses a light generation system comprising a light source, a reflection element, a dichroic optical splitter, a wavelength conversion device and a scattering optical system, and a transmission area of the reflection element allows light of a first wave band emitted by the light source to pass through or enter the dichroic optical splitter after passing through. The reflection element can reflect the light of the first wave band from the dichroic optical splitter, so that the light is emitted back to the dichroic optical splitter, the light can be reused, and the light emitting efficiency of the light source system is improved.

[0017] It is desired to improve the optical performance of laser-phosphor lighting.

[0018] SUMMARY OF THE INVENTION

[0019] It is an object of the present invention to overcome this problem, and to provide a light generating system which has an improved optical performance, which is eyesafe, and which provides a light output having a high brightness, a tunable color point and / or a tunable correlated color temperature.

[0020] According to a first aspect of the invention, this and other objects are achieved light generating system configured to, in operation, emit system light, the light generating system comprising: a solid state light source configured to, in operation, emit light source light, the solid-state light source being selected from the group of diode lasers, super- luminescent diodes, and multi -junction diodes, a beam splitting element being arranged downstream of the first solid-state light source, wherein the beam splitting element is (i) reflective for at least a first part of the light source light, or (ii) transmissive for at least the first part of the light source light, depending on the polarization of the light source light, a polarization maintaining diffusing element being arranged downstream of the beam splitting element, the polarization maintaining diffusing element being configured to receive and diffuse at least the first part of the light source light to provide diffuse light, a first polarization rotator element being arranged between the polarization maintaining diffusing element and the beam splitting element, the first polarization rotator element being configured to rotate the polarization of the diffuse light to provide polarization rotated diffuse light, and a luminescent element being arranged downstream of the first solid-state light source and downstream of the beam splitting element, wherein the beam splitting element further is (i) transmissive for the polarization rotated diffuse light, or (ii) reflective for the polarization rotated diffuse light, depending on the polarization of the polarization rotated diffused light, wherein the light generating system further comprises an optical arrangement 2024PF80358

[0021] 3 arranged downstream of the beam splitting element, the optical arrangement being configured to: (i) receive the polarization rotated diffuse light, (ii) reflect and rotate the polarization of at least a part of the polarization rotated diffuse light to form reflected polarization rotated diffuse light, wherein the luminescent element further is configured to receive and convert at least part of the reflected polarization rotated diffuse light into first converted light, wherein the beam splitting element further is (i) reflective for the reflected polarization rotated diffuse light and reflective for the first converted light, or (ii) transmissive for the reflected polarization rotated diffuse light and transmissive for the first converted light, in order to direct the reflected polarization rotated polarized diffuse light towards the luminescent element and to direct the first converted light towards the optical arrangement, wherein the optical arrangement further is configured to transmit at least part of the first converted light, and wherein, in an operational mode of the light generating system, the system light comprises at least the first converted light.

[0022] Thereby, and especially by providing the light generating system with an optical arrangement as described above, a light generating system which has an improved optical performance, which is eye-safe, and which provides a light output having a high brightness, a tunable color point and / or a tunable correlated color temperature is provided.

[0023] The beam splitting element may comprise a minimum reflectivity for the first part of the light source light being at least 80 %, or at least 90 %, or at least 95 %. Alternatively, the beam splitting element may comprise a minimum transmissivity for the first part of the light source light being at least 80 %, or at least 90 %, or at least 95 %.

[0024] The optical arrangement may comprise a minimum transmissivity for the first converted light being at least 80 %, or at least 90 %, or at least 95 %.

[0025] The beam splitting element may be configured to combine the first converted light and the polarization rotated diffuse light, wherein the optical arrangement may be configured to transmit a part of the polarization rotated diffused light, and wherein, in an operational mode of the light generating system, the system light comprises at least the first converted light and the part of the polarization rotated diffused light.

[0026] Thereby, a light generating system which has an improved optical performance, and which provides a light output having an even higher brightness is provided for.

[0027] The beam splitting element may be (i) reflective for the first part of the light source light and transmissive for a second part of the light source light, or (ii) transmissive for the first part of the light source light and reflective for the second part of the light source 2024PF80358

[0028] 4 light, depending on the polarization of the light source light, the luminescent element may be arranged and configured to receive and, at least partly, convert the second part of the light source light into second converted light, the beam splitting element may further be (i) reflective for the second converted light and transmissive for the polarization rotated diffuse light, or (ii) transmissive for the second converted light and reflective for the polarization rotated diffuse light, the optical arrangement may further be configured to transmit at least part of the second converted light, and, in an operational mode of the light generating system, the system light comprises the first converted light, the second converted light, and, at least in some cases, the polarization rotated diffuse light.

[0029] Thereby, a light generating system with which the above-described advantages are improved even further due to enabling addition of the second converted light to the system light is provided for.

[0030] The optical arrangement may comprise a minimum transmissivity for the second converted light being at least 80 %, or at least 90 %, or at least 95 %.

[0031] The beam splitting element may be configured to combine the first converted light, the second converted light and the polarization rotated diffuse light, and, in an operational mode of the light generating system, the system light comprises the first converted light, the second converted light and the polarization rotated diffuse light.

[0032] Thereby, a light generating system which has a further improved optical performance, and which provides a light output having an even higher brightness is provided for.

[0033] The optical arrangement may further be configured to reflect and rotate the polarization of a part of the first converted light to form reflected polarization rotated first converted light, wherein the luminescent element further may be configured to receive and convert the reflected polarization rotated first converted light into third converted light, wherein the beam splitting element further may be (i) reflective for the reflected polarization rotated first converted light and reflective for the third converted light, or (ii) transmissive for the reflected polarization rotated first converted light and transmissive for the third converted light, in order to direct the reflected polarization rotated first converted light towards the luminescent element and to direct the third converted light towards the optical arrangement, wherein the optical arrangement further may be configured to transmit at least part of the third converted light, and wherein, in an operational mode of the light generating system, the system light comprises the first converted light, the second converted light, the third converted light, and, at least in some cases, the polarization rotated diffuse light. 2024PF80358

[0034] 5

[0035] Thereby, a light generating system with which the above-described advantages are improved even further due to enabling addition of the third converted light to the system light is provided for.

[0036] The optical arrangement may comprise a minimum transmissivity for the third converted light being at least 80 %, or at least 90 %, or at least 95 %.

[0037] The beam splitting element may be configured to combine the first converted light, the second converted light, the third converted light, and the polarization rotated diffuse light.

[0038] Thereby, a light generating system which has a further improved optical performance, and which provides a light output having an even higher brightness is provided for.

[0039] The optical arrangement may comprise a reflective polarizer or a polarization beam splitter being reflective for the polarization rotated diffused light. The polarization rotated diffused light may, e.g., be blue polarization rotated diffused light.

[0040] Thereby, an efficient optical arrangement with which low or no light losses are experienced is provided for.

[0041] The optical arrangement may comprise a partially reflective element and a second polarization rotator element being arranged upstream of the partially reflective element.

[0042] Thereby, not only an efficient optical arrangement with which low or no light losses are experienced, but also being very simple in construction, is provided for.

[0043] The reflectivity of the partially reflective element may be tunable for polarization rotated diffused light.

[0044] Thereby, the partially reflective element may be tuned to the wavelength and / or polarization of the incoming light to be reflected, thus further increasing the efficiency.

[0045] The partially reflective element may comprise a spatially varying reflectance for the polarization rotated diffused light.

[0046] The partially reflective element may be arranged and configured to be shiftable in position.

[0047] Thereby, the partially reflective element may be adapted to the wavelength and / or polarization of the incoming light to be reflected, thus further increasing the efficiency, in a very simple and robust manner. 2024PF80358

[0048] 6

[0049] The partially reflective element may be a dichroic mirror or a semi-reflective specular mirror.

[0050] Thereby, a very simple partially reflective element may be provided for.

[0051] The first polarization rotator element may be a quarter wavelength plate.

[0052] The second polarization rotator element may be a quarter wavelength plate.

[0053] Thereby, very simple and efficient polarization rotator elements may be provided for.

[0054] The beam splitting element may comprise a polarizing beam splitting component and a direct beam splitting component.

[0055] The direct beam splitting component may be a dichroic mirror. Thus, the optical arrangement may comprise a polarizing beam splitter / reflective polarizer and a dichroic mirror.

[0056] Thereby, not only an efficient beam splitting element with which low or no light losses are experienced, but also being very simple in construction, is provided for.

[0057] The light generating system may further comprise a first optical element arranged downstream of the solid-state light source and upstream the beam splitting element and being configured to collimate the light source light.

[0058] Thereby, loss of light source light before the light source light reaches the beam splitting component may be minimized or avoided altogether.

[0059] The light generating system may further comprise a second optical element arranged downstream of the luminescent element and upstream of the beam splitting element, the second optical element being configured to: (i) focus one or more of the first part of the light source light, the second part of the light source light, the reflected polarization rotated diffuse light, and the reflected polarization rotated first converted light on the first luminescent element and (ii) collimate one or more of the first converted light, the second converted light and the third converted light.

[0060] Thereby, it may be ensured that all or as good as all light, which it is intended to convert by the luminescent element reaches the luminescent element, and that loss of converted light before the converted light reaches the beam splitting component may be minimized or avoided altogether.

[0061] The light generating system may further comprise a third optical element arranged downstream of the polarization maintaining diffusing element and upstream of the first polarization rotator element, the third optical element being configured to focus the first 2024PF80358

[0062] 7 part of the light source light on the polarization maintaining diffusing element, and (ii) collimate the diffuse light.

[0063] Thereby, it may be ensured that all, or as good as all, light, which it is intended to diffuse by the diffusing element reaches the diffusing element, and that loss of diffuse light before the diffuse light reaches the beam splitting component may be minimized or avoided altogether.

[0064] The light generating system may further comprise a fourth optical element arranged downstream of the optical arrangement and configured to collimate or to focus the system light.

[0065] The light source light may comprise a first peak emission wavelength, I, falling within the wavelength interval of 420 nm to 490 nm.

[0066] The first converted light may comprise a second peak emission wavelength, X2, falling within the wavelength interval of 500 nm to 590 nm or 520 nm to 565 nm.

[0067] The second converted light may comprise a third peak emission wavelength, X3, falling within the wavelength interval of 500 nm to 590 nm or 520 nm to 565 nm.

[0068] The third converted light may comprise a fourth peak emission wavelength, X4, falling within the wavelength interval of 520 nm to 600 nm or 540 nm to 590 nm.

[0069] The system light may be white light having a correlated color temperature, CCT, in a range of 2000 K to 9000 K, 3000 K to 7000 K, 3000 K to 5000 K or 3500 K to 4500 K.

[0070] The system light may be white light having a color rendering index of at least 80.

[0071] The luminescent element may comprise one or more luminescent materials. In embodiments the luminescent material comprises a luminescent material of the type AsBsOn Ce, wherein A in embodiments comprises one or more of Y, La, Gd, Tb and Lu, especially (at least) one or more of Y, Gd, Tb and Lu, and wherein B in embodiments comprises one or more of Al, Ga, In and Sc. Especially, A may comprise one or more of Y, Gd and Lu, such as especially one or more of Y and Lu. In embodiments, B may comprise one or more of Al and Ga, more especially at least Al, such as essentially entirely Al. In other embodiments, B may comprise one or more of Al and Ga, more especially at least Ga. The former embodiments may show an emission that is red-shifted relative to an emission of the latter embodiments; or, the latter embodiments show an emission that may be relatively blue- shifted relative to the former embodiments. 2024PF80358

[0072] 8

[0073] In embodiments, the luminescent material comprises one or more of MS:Eu2+and / or NfcSis Eu2and / or MAlSiNvEu2and / or Ca2AlSi3O2Ns:Eu2+, etc., wherein M comprises one or more of Ba, Sr, and Ca, especially in embodiments at least Sr. Hence, in embodiments, the luminescent material may comprise one or more materials selected from the group consisting of (Ba,Sr,Ca)S:Eu, (Ba,Sr,Ca)AlSiN3:Eu and (Ba,Sr,Ca)2SisN8:Eu. In these compounds, europium (Eu) is substantially or only divalent, and replaces one or more of the indicated divalent cations. In general, Eu will not be present in amounts larger than 10% of the cation; its presence will especially be in the range of about 0.5 to 10%, more especially in the range of about 0.5 to 5% relative to the cation(s) it replaces. The term “:Eu”, indicates that part of the metal ions is replaced by Eu (in these examples by Eu2+).

[0074] In embodiments, the luminescent material comprises a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon and titanium, wherein X comprises a monovalent anion, at least comprising fluorine. Relevant alkaline cations (M) are sodium (Na), potassium (K) and rubidium (Rb). Optionally, also lithium and / or cesium may be applied. In a preferred embodiment, M comprises at least potassium. In yet another embodiment, M comprises at least rubidium. The phrase “wherein M comprises at least potassium” indicates for instance that of all M cations in a mole M’xM2-2xAX6 , a fraction comprises K+and an optionally remaining fraction comprises one or more other monovalent (alkaline) cations (see also below). In another preferred embodiment, M comprises at least potassium and rubidium. Optionally, the M’xM2-2xAX6 luminescent material has the hexagonal phase. In yet another embodiment, the M’xM2-2xAX6 luminescent material has the cubic phase. Relevant alkaline earth cations (M’) are magnesium (Mg), strontium (Sr), calcium (Ca) and barium (Ba), especially one or more of Sr and Ba.

[0075] The invention further relates to a lamp, a luminaire, a vehicle light, projection device, a search light, or a stage lighting device comprising a light generating system according to the invention.

[0076] It is noted that the invention relates to all possible combinations of features recited in the claims.

[0077] BRIEF DESCRIPTION OF THE DRAWINGS

[0078] This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing embodiment(s) of the invention. 2024PF80358

[0079] 9

[0080] Fig. 1 schematically shows an embodiment of a light generation system according to the invention without an optical arrangement.

[0081] Fig. 2 schematically shows an embodiment of a light generation system according to the invention with an optical arrangement.

[0082] Fig. 3 schematically shows another embodiment of a light generation system according to the invention with an optical arrangement.

[0083] Fig. 4 schematically shows another embodiment of a light generation system according to the invention with an optical arrangement.

[0084] Fig. 5 schematically shows another embodiment of a light generation system according to the invention with an optical arrangement.

[0085] Fig. 6 shows a schematical side view of a lamp comprising a light generating system according to the invention.

[0086] Fig. 7 shows a schematical side view of a luminaire comprising a lamp and a light generating system according to the invention.

[0087] As illustrated in the figures, the sizes of layers and regions are exaggerated for illustrative purposes and, thus, are provided to illustrate the general structures of embodiments of the present invention. Like reference numerals refer to like elements throughout.

[0088] DETAILED DESCRIPTION

[0089] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which currently preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and fully convey the scope of the invention to the skilled person.

[0090] Fig. 1 schematically shows a light generation system 1, which does not comprise an optical arrangement 15 of the type to be described further below. The light generating system 1 is configured to, in operation, emit system light 2. The light generation system 1 comprises a solid state light source 3, a beam splitting element 7, a luminescent element 5, a polarization maintaining diffusing element 8, and a first polarization rotator element 10.

[0091] The solid state light source 3 is configured to, in operation, emit light source light 4. The light source light 4 comprises a first part 41 of the light source light 4. The light 2024PF80358

[0092] 10 source light 4 further comprises a second part 42 of the light source light 4. The light source light 4 may comprise a first peak emission wavelength, I, falling within the wavelength interval of 400 to 490 nm, or 420 nm to 490 nm. The light source light 4 may be blue light.

[0093] The beam splitting element 7 is arranged downstream of the first solid-state light source 4. The beam splitting element 7 is transmissive for the first part 41 of the light source light 4 and reflective for the second part 42 of the light source light 4. Alternatively, the beam splitting component 7 may be reflective for the first part 41 of the light source light 4 and transmissive for the second part 42 of the light source light 4. The beam splitting element 7 may comprise a polarizing beam splitting component and a direct beam splitting component. The polarizing beam splitting component and the direct beam splitting component, and thus the beam splitting element 7, may be formed in one piece.

[0094] The luminescent element 5 is arranged downstream of the first solid-state light source 3. The luminescent element 5 is further arranged downstream of the beam splitting element 7. The luminescent element 5 is arranged and configured to receive the first part 41 of the light source light 4. The luminescent element 5 is further configured to, at least partly, convert the first part 41 of the light source light 4 into converted light 60.

[0095] The polarization maintaining diffusing element 8 is arranged downstream of the first solid-state light source 3. The polarization maintaining diffusing element 8 is further arranged downstream of the beam splitting element 7. The polarization maintaining diffusing element 8 is arranged and configured to receive the second part 42 of the light source light 4. The polarization maintaining diffusing element 8 is further configured to diffuse the second part 42 of the light source light 4 such as to provide diffuse light 9.

[0096] The first polarization rotator element 10 is arranged between the polarization maintaining diffusing element 8 and the beam splitting element 7. The first polarization rotator element 10 is configured to rotate the polarization of the diffuse light 9 such as to provide polarization rotated diffuse light 11.

[0097] The beam splitting element 7 is further reflective for the second converted light 6 and transmissive for the polarization rotated diffuse light 11. Alternatively, the beam splitting element 7 may be transmissive for the second converted light 6 and reflective for the polarization rotated diffuse light 11. The beam splitting element 7 is configured to combine the converted light 60 and the polarization rotated diffuse light 11.

[0098] In an operational mode of the light generating system 1, the system light 2 thus comprises the converted light 60 and the polarization rotated diffuse light 11. 2024PF80358

[0099] 11

[0100] The light generating system 1 may further optionally comprise one or more of a first optical element 12, a second optical element 13, and a third optical element 14.

[0101] The first optical element 12 is arranged downstream of the solid-state light source 3. The first optical element 12 is configured to collimate the light source light 4.

[0102] The second optical element 13 is arranged downstream of the luminescent element 5 and upstream of the beam splitting element 7. The second optical element 13 is configured to focus the first part 41 of the light source light 4 on the first luminescent element 5. The second optical element 13 is further configured to collimate the converted light 60.

[0103] The third optical element 14 is arranged downstream of the polarization maintaining diffusing element 8 and upstream of the first polarization rotator element 10. The third optical element 14 is configured to focus the second component 42 of the light source light 4 on the polarization maintaining diffusing element 8. The third optical element 14 is further configured to collimate the diffuse light 9.

[0104] It is noted that at least the following two combinations are possible.

[0105] The beam splitting element 7 is reflective for at least a first part 41 of the light source light 4, the beam splitting element 7 is transmissive for the polarization rotated diffuse light 11, and the beam splitting element 7 is reflective for the reflected polarization rotated diffuse light 16 and reflective for the first converted light 17.

[0106] The beam splitting element 7 is transmissive for at least the first part 41 of the light source light 4, the beam splitting element 7 is reflective for the polarization rotated diffuse light 11, and the beam splitting element 7 is transmissive for the reflected polarization rotated diffuse light 16 and transmissive for the first converted light 17.

[0107] Fig. 2 schematically shows an embodiment of a light generation system 100 according to the invention. Generally, and irrespective of the embodiment, the light generation system 1 comprises a solid state light source 3, a beam splitting element 7, a luminescent element 5, a polarization maintaining diffusing element 8, a first polarization rotator element 10, and an optical arrangement 15. The light generation system 100 differs from the light generation system 1 described above with reference to Fig. 1 in virtue of the following features.

[0108] The beam splitting element 7 is transmissive for at least a first part 41 of the light source light 4. Also, the first part 41 of the light source light 4 here comprises all or almost all of the of the light source light 4. More specifically, if the light source light 4 comprises mainly the first part 41 of the light source light 4, at least 80 % of the light source 2024PF80358

[0109] 12 light 4 is the first part 41 of the light source light 4, or at least 90 % of the light source light 4 is the first part 41 of the light source light 4, or at least 95 % of the light source light 4 is the first part 41 of the light source light 4.

[0110] The polarization maintaining diffusing element 8 is arranged and configured to receive the first part 41 of the light source light 4. The polarization maintaining diffusing element 8 is further configured to diffuse the first part 41 of the light source light 4 such as to provide diffuse light 9.

[0111] The first polarization rotator element 10 is configured to rotate the polarization of the diffuse light 9 such as to provide polarization rotated diffuse light 11. The first polarization rotator element 10 may for instance be a quarter wavelength plate. The first polarization rotator element 10 does not rotate the polarization of the first part 41 of the light source light 4.

[0112] The beam splitting element 7 is further reflective for the polarization rotated diffuse light 11. Alternatively, depending on the polarization of the polarization rotated diffuse light 11, the beam splitting element 7 may be transmissive for the polarization rotated diffuse light 11.

[0113] The light generation system 100 further comprises an optical arrangement 15. The optical arrangement 15 is arranged downstream of the beam splitting element 7. The optical arrangement 15 is arranged and configured to receive the polarization rotated diffuse light 11. The optical arrangement 15 is further configured to reflect and rotate the polarization of a part of the polarization rotated diffuse light 11 such as to form reflected and polarization rotated diffuse light 16. The optical arrangement 15 is further configured to transmit at least a part of the polarization rotated diffuse light 11.

[0114] The optical arrangement 15 comprises a partially reflective element 18 and a second polarization rotator element 19. Alternatively, the optical arrangement 15 is or comprises a reflective polarizer.

[0115] The partially reflective element 18 is configured to reflect a part of the polarization rotated diffuse light 11 and to transmit another part of the polarization rotated diffuse light 11. The reflectivity of the partially reflective element 18 may be tunable. The partially reflective element 18 may comprise a spatially varying reflectance. The partially reflective element 18 may comprise different area parts having different reflectivity. The partially reflective element 18 may be arranged and configured to be shiftable in position. The partially reflective element 18 may for instance be a semi -reflective specular mirror. 2024PF80358

[0116] 13

[0117] The second polarization rotator element 19 is arranged upstream of the partially reflective element 18. The second polarization rotator element 19 is configured to rotate the polarization of a part of the polarization rotated diffuse light 11. The second polarization rotator element 19 may for instance be a quarter wavelength plate.

[0118] The luminescent element 5 is further arranged and configured to receive the reflected and polarization rotated diffuse light 16. The luminescent element 5 is further configured to convert the reflected and polarization rotated diffuse light 16 into first converted light 17. The first converted light 17 may comprise a second peak emission wavelength, X2, falling within the wavelength interval of 500 nm to 590 nm or 520 nm to 565 nm. The first converted light 17 may be yellow light or yellow-green light or yellow-orange light.

[0119] The beam splitting element 7 is further reflective for the reflected and polarization rotated diffuse light 16 and reflective for the first converted light 17. Alternatively, the beam splitting element 7 may be transmissive for the reflected and polarization rotated diffuse light 16 and transmissive for the first converted light 17. In either case, the beam splitting element 7 is configured to direct the reflected and polarization rotated polarized diffuse light 16 towards the luminescent element 5 and to direct the first converted light 17 towards the optical arrangement 15. The beam splitting element 7 is configured to combine the first converted light 17 and the polarization rotated diffuse light 11.

[0120] The optical arrangement 15 is further configured to transmit at least part of the first converted light 17. In an operational mode of the light generating system 100, the system light 2 thus comprises at least the first converted light 17. The system light 2 may be white light with a correlated color temperature, CCT, of 2000 K to 9000 K, 3000 K to 7000 K, 3000 K to 5000 K or 3500 K to 4500 K. The system light 2 may further comprise a color rendering index of at least 80.

[0121] The optical arrangement 15 may further be configured to transmit a part of the polarization rotated diffused light 11. In an operational mode of the light generating system 100, the system light 2 then comprises the first converted light 17, and the polarization rotated diffuse light 11. The system light 2 may be white light with a correlated color temperature, CCT, of 2000 K to 9000 K, 3000 K to 7000 K, 3000 K to 5000 K or 3500 K to 4500 K. The system light 2 may further comprise a color rendering index of at least 80. 2024PF80358

[0122] 14

[0123] The light generating system 100 may further optionally comprise one or more of a first optical element 12, a second optical element 13, and a third optical element 14 (for simplicity not shown in Fig. 2, but cf. Fig. 3).

[0124] The first optical element 12 is arranged downstream of the solid-state light source 3. The first optical element 12 is configured to collimate the light source light 4.

[0125] The second optical element 13 is arranged downstream of the luminescent element 5 and upstream of the beam splitting element 7. The second optical element 13 is configured to focus the reflected and polarization rotated diffuse light 16 on the first luminescent element 5. The second optical element 13 is further configured to collimate the first converted light 17.

[0126] The third optical element 14 is arranged downstream of the polarization maintaining diffusing element 8 and upstream of the first polarization rotator element 10. The third optical element 14 is configured to focus the first part 41 of the light source light 4 on the polarization maintaining diffusing element 8. The third optical element 14 is further configured to collimate the diffuse light 9.

[0127] The first optical element 12, the second optical element 13 and the third optical element 14 may be lenses or lens systems.

[0128] It is noted that at least the following two combinations are possible.

[0129] The beam splitting element 7 is reflective for at least a first part 41 of the light source light 4, the beam splitting element 7 is transmissive for the polarization rotated diffuse light 11, and the beam splitting element 7 is reflective for the reflected polarization rotated diffuse light 16 and reflective for the first converted light 17.

[0130] The beam splitting element 7 is transmissive for at least the first part 41 of the light source light 4, the beam splitting element 7 is reflective for the polarization rotated diffuse light 11, and the beam splitting element 7 is transmissive for the reflected polarization rotated diffuse light 16 and transmissive for the first converted light 17.

[0131] Fig. 3 schematically shows another embodiment of a light generation system 101 according to the invention. The light generation system 101 differs from the light generation system 100 described above with reference to Fig. 2 in virtue of the following features.

[0132] The beam splitting element 7 is reflective for the first part 41 of the light source light 4. The beam splitting element 7 is further transmissive for a second part 42 of the light source light 4. 2024PF80358

[0133] 15

[0134] In this case the light source light 4 thus comprises both a first part 41 of the light source light 4 and a second part 42 of the light source light 4. In such a case the ratio between the first part 41 of the light source light 4 and the second part 42 of the light source light 4 may be in a range of 0.7 to 1.3, or in a range of 0.8 to 1.2, or in a range of 0.9 to 1.1.

[0135] The polarization maintaining diffusing element 8 is arranged and configured to receive the first part 41 of the light source light 4. The polarization maintaining diffusing element 8 is further configured to diffuse the first part 41 of the light source light 4 such as to provide diffuse light 9.

[0136] The first polarization rotator element 10 is configured to rotate the polarization of the diffuse light 9 such as to provide polarization rotated diffuse light 11. The first polarization rotator element 10 may for instance be a quarter wavelength plate. The first polarization rotator element 10 does not rotate the polarization of the first part 41 of the light source light 4.

[0137] The luminescent element 5 is arranged and configured to receive and, at least partly, convert the second part 42 of the light source light 4 into second converted light 6. The second converted light 6 may comprise a third peak emission wavelength, 3, falling within the wavelength interval of 500 nm to 590 nm or 520 nm to 565 nm. The second converted light 6 may be yellow light or yellow-green light or yellow-orange light.

[0138] The beam splitting element 7 is further transmissive for the polarization rotated diffuse light 11 and reflective for the second converted light 6. Alternatively, the beam splitting element 7 may be reflective for the polarization rotated diffuse light 11 and transmissive for the second converted light 6.

[0139] The optical arrangement 15 is configured to reflect and rotate the polarization of a part of the polarization rotated diffuse light 11 such as to form reflected and polarization rotated diffuse light 16. The optical arrangement 15 is further configured to transmit a part of the polarization rotated diffuse light 11. The optical arrangement 15 is further configured to transmit the second converted light 6.

[0140] The optical arrangement 15 comprises a partially reflective element 18 and a second polarization rotator element 19.

[0141] The partially reflective element 18 is further configured to transmit the second converted light 6. The reflectivity of the partially reflective element 18 may be tunable. The partially reflective element 18 may comprise a spatially varying reflectance. The partially reflective element 18 may comprise different area parts having different reflectivity. The 2024PF80358

[0142] 16 partially reflective element 18 may be arranged and configured to be shiftable in position. The partially reflective element 18 may for instance be a semi -reflective specular mirror.

[0143] The second polarization rotator element 19 is arranged upstream of the partially reflective element 18. The second polarization rotator element 19 is configured to rotate the polarization of a part of the polarization rotated diffuse light 11. The second polarization rotator element 19 may for instance be a quarter wavelength plate.

[0144] The optical arrangement 15 is further configured to transmit at least part of the second converted light 6. The beam splitting element 7 is configured to combine the first converted light 17, the second converted light 6 and, at least in some cases, a part of the polarization rotated diffuse light 11.

[0145] In an operational mode of the light generating system 101, the system light 2 thus comprises the second converted light 6, the first converted light 17, and, at least in some cases, the part of the polarization rotated diffuse light 11 transmitted by the optical arrangement 15. The system light 2 may be white light with a correlated color temperature, CCT, of 2000 K to 9000 K, 3000 K to 7000 K, 3000 K to 5000 K or 3500 K to 4500 K. The system light 2 may further comprise a color rendering index of at least 80.

[0146] The light generating system 101 may further optionally comprise one or more of a first optical element 12, a second optical element 13, and a third optical element 14.

[0147] The first optical element 12 is arranged downstream of the solid-state light source 3. The first optical element 12 is configured to collimate the light source light 4.

[0148] The second optical element 13 is arranged downstream of the luminescent element 5 and upstream of the beam splitting element 7. The second optical element 13 is configured to focus the reflected and polarization rotated diffuse light 16 and the second part 42 of the light source light 4 on the first luminescent element 5. The second optical element 13 is further configured to collimate the first converted light 17 and the second converted light 6.

[0149] The third optical element 14 is arranged downstream of the polarization maintaining diffusing element 8 and upstream of the first polarization rotator element 10. The third optical element 14 is configured to focus the first part 41 of the light source light 4 on the polarization maintaining diffusing element 8. The third optical element 14 is further configured to collimate the diffuse light 9.

[0150] As may be seen in Fig. 3, the light generating system 101 may further optionally comprise a fourth optical element 22. The fourth optical element 22 is arranged downstream of the optical arrangement 15. The fourth optical element 22 is configured to 2024PF80358

[0151] 17 collimate the system light 2. Alternatively, the fourth optical element 22 may be configured to focus the system light 2.

[0152] The first optical element 12, the second optical element 13, the third optical element 14, and the fourth optical element 22 may be lenses or lens systems.

[0153] It is noted that at least the following two combinations are possible.

[0154] The beam splitting element 7 is reflective for the first part 41 of the light source light 4, the beam splitting element 7 is transmissive for the second part 42 of the light source light 4, the beam splitting element 7 is transmissive for the polarization rotated diffuse light 11, and the beam splitting element 7 is reflective for the reflected polarization rotated diffuse light 16, reflective for the first converted light 17, and reflective for the second converted light 6.

[0155] The beam splitting element 7 is transmissive for at least the first part 41 of the light source light 4, the beam splitting element 7 is reflective for the second part 42 of the light source light 4, the beam splitting element 7 is reflective for the polarization rotated diffuse light 11, and the beam splitting element 7 is transmissive for the reflected polarization rotated diffuse light 16, transmissive for the first converted light 17, transmissive for the second converted light 6.

[0156] Fig. 4 schematically shows another embodiment of a light generation system 102 according to the invention. The light generation system 102 is similar to but differs from the light generation system 101 described above with reference to Fig. 3 in virtue of the following features.

[0157] The beam splitting element 7 is transmissive for the first part 41 of the light source light 4. The beam splitting element 7 is further reflective for a second part 42 of the light source light 4.

[0158] The polarization maintaining diffusing element 8 is arranged and configured to receive the first part 41 of the light source light 4. The polarization maintaining diffusing element 8 is further configured to diffuse the first part 41 of the light source light 4 such as to provide diffuse light 9.

[0159] The first polarization rotator element 10 is configured to rotate the polarization of the diffuse light 9 such as to provide polarization rotated diffuse light 11. The first polarization rotator element 10 may for instance be a quarter wavelength plate. The first polarization rotator element 10 does not rotate the polarization of the first part 41 of the light source light 4. 2024PF80358

[0160] 18

[0161] The luminescent element 5 is arranged and configured to receive and, at least partly, convert the second part 42 of the light source light 4 into second converted light 6. The second converted light 6 may comprise a third peak emission wavelength, 3, falling within the wavelength interval of 500 nm to 590 nm or 520 nm to 565 nm. The second converted light 6 may be yellow light or yellow-green light or yellow-orange light.

[0162] The beam splitting element 7 is further reflective for the polarization rotated diffuse light 11 and transmissive for the second converted light 6. Alternatively, the beam splitting element 7 may be transmissive for the polarization rotated diffuse light 11 and reflective for the second converted light 6.

[0163] The optical arrangement 15 is configured to reflect and rotate the polarization of a part of the polarization rotated diffuse light 11 such as to form reflected and polarization rotated diffuse light 16. The optical arrangement 15 is further configured to transmit a part of the polarization rotated diffuse light 11. The optical arrangement 15 is further configured to transmit the second converted light 6.

[0164] The optical arrangement 15 comprises a partially reflective element 18 and a second polarization rotator element 19.

[0165] The beam splitting element 7 is further transmissive for the reflected and polarization rotated diffuse light 16 and transmissive for the first converted light 17. Alternatively, the beam splitting element 7 may be reflective for the reflected and polarization rotated diffuse light 16 and reflective for the first converted light 17.

[0166] The partially reflective element 18 is further configured to transmit the second converted light 6. The reflectivity of the partially reflective element 18 may be tunable. The partially reflective element 18 may comprise a spatially varying reflectance. The partially reflective element 18 may comprise different area parts having different reflectivity. The partially reflective element 18 may be arranged and configured to be shiftable in position. The partially reflective element 18 may for instance be a semi -reflective specular mirror.

[0167] The second polarization rotator element 19 is arranged upstream of the partially reflective element 18. The second polarization rotator element 19 is configured to rotate the polarization of a part of the polarization rotated diffuse light 11. The second polarization rotator element 19 may for instance be a quarter wavelength plate.

[0168] The optical arrangement 15 is further configured to transmit at least part of the third converted light 21. The beam splitting element 7 is configured to combine the first converted light 17, the second converted light 6, the third converted light 21, and, at least in some cases, the polarization rotated diffuse light 11. 2024PF80358

[0169] 19

[0170] In an operational mode of the light generating system 102, the system light 2 thus comprises the second converted light 6, the first converted light 17, and, at least in some cases, the part of the polarization rotated diffuse light 11 transmitted by the optical arrangement 15. The system light 2 may be white light with a correlated color temperature, CCT, of 2000 K to 9000 K, 3000 K to 7000 K, 3000 K to 5000 K or 3500 K to 4500 K. The system light 2 may further comprise a color rendering index of at least 80.

[0171] The light generating system 102 may further optionally comprise one or more of a first optical element 12, a second optical element 13, and a third optical element 14 (for simplicity not shown in Fig. 4, but cf. Fig. 3).

[0172] The first optical element 12 is arranged downstream of the solid-state light source 3. The first optical element 12 is configured to collimate the light source light 4.

[0173] The second optical element 13 is arranged downstream of the luminescent element 5 and upstream of the beam splitting element 7. The second optical element 13 is configured to focus the reflected and polarization rotated diffuse light 16 and the second part 42 of the light source light on the first luminescent element 5. The second optical element 13 is further configured to collimate the first converted light 17 and the second converted light 6.

[0174] The third optical element 14 is arranged downstream of the polarization maintaining diffusing element 8 and upstream of the first polarization rotator element 10. The third optical element 14 is configured to focus the first part 41 of the light source light 4 on the polarization maintaining diffusing element 8. The third optical element 14 is further configured to collimate the diffuse light 9.

[0175] The first optical element 12, the second optical element 13 and the third optical element 14 may be lenses or lens systems.

[0176] Fig. 5 schematically shows another embodiment of a light generation system 103 according to the invention. The light generation system 103 differs from the light generation system 101 described above with reference to Fig. 3 in virtue of the following features.

[0177] The light generation system 103 comprises an optical arrangement 15. The optical arrangement 15 of the light generation system 103 is further configured to reflect and rotate the polarization of a part of the first converted light 17 to form reflected and polarization rotated first converted light 20.

[0178] In other words, the partially reflective element 18 is configured to reflect a part of the first converted light 17, and the second polarization rotator element 19 is configured to rotate the polarization of the part of the first converted light 17 reflected by the partially 2024PF80358

[0179] 20 reflective element 18. Thereby, the reflected and polarization rotated first converted light 20 is formed.

[0180] The luminescent element 5 is further configured to receive the reflected and polarization rotated first converted light 20. The luminescent element 5 is still further configured to convert the reflected and polarization rotated first converted light 20 such as to form third converted light 21. The third converted light 21 may comprise a fourth peak emission wavelength, X4, falling within the wavelength interval of 500 nm to 590 nm or 520 nm to 565 nm. The third converted light 21 may be yellow light or yellow-green light or yellow-orange light.

[0181] The beam splitting element 7 is further reflective for the reflected and polarization rotated first converted light 20 and reflective for the third converted light 21. Alternatively, the beam splitting element 7 is transmissive for the reflected and polarization rotated first converted light 20 and transmissive for the third converted light 21. In either case, the beam splitting element 7 is configured to direct the reflected and polarization rotated first converted light 20 towards the luminescent element 5 and to direct the third converted light 21 towards the optical arrangement 15. The beam splitting element 7 is configured to combine the second converted light 6, the first converted light 17, the third converted light 21, and the polarization rotated diffuse light 11.

[0182] The optical arrangement 15 is further configured to transmit the third converted light 21.

[0183] In an operational mode of the light generating system 103, the system light 2 thus comprises the second converted light 6, the first converted light 17, the polarization rotated diffuse light 11, and the third converted light 21. The system light 2 may be white light with a correlated color temperature, CCT, of 2000 K to 9000 K, 3000 K to 7000 K, 3000 K to 5000 K or 3500 K to 4500 K. The system light 2 may further comprise a color rendering index of at least 80.

[0184] The light generating system 103 may further optionally comprise one or more of a first optical element 12, a second optical element 13, and a third optical element 14.

[0185] The first optical element 12 is arranged downstream of the solid-state light source 3. The first optical element 12 is configured to collimate the light source light 4.

[0186] The second optical element 13 is arranged downstream of the luminescent element 5 and upstream of the beam splitting element 7. The second optical element 13 is configured to focus the reflected and polarization rotated diffuse light 16, the second part 42 of the light source light 4 and the reflected and polarization rotated second converted light 20 2024PF80358

[0187] 21 on the first luminescent element 5. The second optical element 13 is further configured to collimate the first converted light 17, the second converted light 6, and the third converted light 21.

[0188] The third optical element 14 is arranged downstream of the polarization maintaining diffusing element 8 and upstream of the first polarization rotator element 10. The third optical element 14 is configured to focus the first part 41 of the light source light 4 on the polarization maintaining diffusing element 8. The third optical element 14 is further configured to collimate the diffuse light 9.

[0189] As may be seen in Fig. 5, the light generating system 103 may further optionally comprise a fourth optical element 22. The fourth optical element 22 is arranged downstream of the optical arrangement 15. The fourth optical element 22 is configured to focus the system light 2. Alternatively, the fourth optical element 22 may be configured to collimate the system light 2.

[0190] The first optical element 12, the second optical element 13, the third optical element 14, and the fourth optical element 22 may be lenses or lens systems.

[0191] It is noted that at least the following two combinations are possible.

[0192] The beam splitting element 7 is reflective for the first part 41 of the light source light 4, the beam splitting element 7 is transmissive for the second part 42 of the light source light 4, the beam splitting element 7 is transmissive for the polarization rotated diffuse light 11, and the beam splitting element 7 is reflective for the reflected polarization rotated diffuse light 16, reflective for the first converted light 17, reflective for the second converted light 6, and reflective for the third converted light 21.

[0193] The beam splitting element 7 is transmissive for at least the first part 41 of the light source light 4, the beam splitting element 7 is reflective for the second part 42 of the light source light 4, the beam splitting element 7 is reflective for the polarization rotated diffuse light 11, and the beam splitting element 7 is transmissive for the reflected polarization rotated diffuse light 16, transmissive for the first converted light 17, transmissive for the second converted light 6, and transmissive for the third converted light 21.

[0194] It is noted that in either of the light generating systems 100 to 103 described above in relation to Figs. 2 to 5, the optical arrangement 15 proposed herein can be provided or applied as an add-on component, for instance to a light generating system 1 as described above in relation to Fig. 1.

[0195] The change in CCT for system light 2 formed and emitted by each of the light generating systems 101 and 103, respectively, described above as compared to system light 2024PF80358

[0196] 22 formed and transmitted by a light generating system 100 as shown in Fig. 1, was calculated. The results are shown in table 1 below. It may be seen that a difference in CCT can be obtained by providing an optical arrangement 15. It may be further be seen that larger differences in CCT can be obtained by increasing the reflectivity of the optical arrangement 15.

[0197] Table 1

[0198] Fig. 6 shows an exemplary lamp 300 comprising a light generating system 100 - 103 according to any embodiment of the invention.

[0199] The lamp 300 further comprises a driver or controller 305 configured for controlling the light generating system 100-103. The light generating system 100-103 may also comprise a controller, which may or may not be separate from the controller 305. In other words, the controller 305 and the controller of the light generating system 100-103 may be integrated into one and the same driver or controller, or they may be mutually separate units.

[0200] The lamp 300 further comprises an envelope 301 at least partially enveloping the light generating system 100-103. The lamp 300 further comprises a cap 303. As shown in Fig. 6, the controller 305 is arranged within the envelope 301. When comprising a cap 303, the controller 305 may also be arranged inside the cap 303 such that it is hidden from view. The lamp 300 further comprises threading 302 for connection to a socket, and a terminal 304 for connection to a source of electrical energy.

[0201] The envelope 301 of the lamp 300 may further and optionally be provided with a coating (not shown), such as a reflective coating, covering at least a part of the envelope 301.

[0202] Turning finally to Fig. 7, an exemplary luminaire in the form of a pendant 400 is shown. Alternatively, Fig. 7 may show a vehicle light 400, projection device 400, a search 2024PF80358

[0203] 23 light 400, or a stage lighting device 400. The pendant 400 comprises a light generating system 100-103 according to any embodiment of the invention. The light generating system 100-103 is as shown in Fig. 7 provided within a lamp 300 in the form of a light bulb.

[0204] As is also mentioned above, the light bulb further comprises a transparent envelope (cf. transparent envelope 301 of lamp 300) at least partially enveloping the at least one light generating system 100-103. The transparent envelope may be shaped in any feasible shape, for example such as to resemble the shape of any one of a standard light bulb, a globe light bulb, a candlelight bulb, a customized light bulb and even a spiral light bulb. The transparent envelope may comprise a luminescent material. The transparent envelope may be a glass envelope.

[0205] The pendant 400 further comprises a socket 401 for connecting the lamp 300, and thereby the light generating device 1, 100-103, to the pendant 400. The socket 401 is adapted to cooperate with the base 303 of the lamp 300. The socket 401 may comprise a threading adapted to cooperate with the threading 302 of the lamp 300. The socket 401 may comprise a terminal adapted to cooperate with the terminal 304 of the lamp 300. The pendant 400 further comprises a reflector or screen 403.

[0206] The pendant 400 may further comprise a driver 402 configured for controlling the light generating device 1, 100-103. The driver 402 may or may not be the same unit as the controller 305 described above. In other words, the driver 402 and the controller 305 may be integrated into one and the same driver or controller, or they may be mutually separate units. Alternatively, or additionally, the light generating system 100-103 may also comprise a controller, which may or may not be separate from one or both of the driver 402 and the controller 305.

[0207] As shown in Fig. 7, the driver 402 is arranged on a reflector or screen 403 of the pendant 400. The driver may also be arranged within or incorporated into the reflector or screen 403. The pendant 400 further comprises an electrical wiring 404 for connection to a source of electricity, such as a mains.

[0208] It is noted that the pendant 400 shown in Fig. 7 is only one example of a luminaire according to the invention. Any suitable type of luminaire may be envisaged, such as but not limited to, an automotive lighting device, a studio lighting device, a stage lighting device, an entertainment lighting device, a standing luminaire, a wall hung luminaire, a chandelier, a reading luminaire, an outdoor luminaire, and a table luminaire. 2024PF80358

[0209] 24

[0210] The person skilled in the art realizes that the present invention by no means is limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims.

[0211] The term “and / or” especially relates to one or more of the items mentioned before and after “and / or”. For instance, a phrase “item 1 and / or item 2” and similar phrases may relate to one or more of item 1 and item 2. The term "comprising" may in an embodiment refer to "consisting of but may in another embodiment also refer to "containing at least the defined species and optionally one or more other species".

[0212] Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein.

[0213] Additionally, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the 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 measured cannot be used to advantage.

Claims

2024PF8035825CLAIMS:

1. A light generating system (100) configured to, in operation, emit system light(2), the light generating system comprising: a solid state light source (3) configured to, in operation, emit light source light (4), the solid-state light source (3) being selected from the group of diode lasers, super- luminescent diodes, and multi -junction diodes, a beam splitting element (7) being arranged downstream of the first solid-state light source (4), wherein the beam splitting element (7) is (i) reflective for at least a first part (41) of the light source light, or (ii) transmissive for at least the first part (41) of the light source light, depending on the polarization of the light source light, a polarization maintaining diffusing element (8) being arranged downstream of the beam splitting element (7), the polarization maintaining diffusing element (8) being configured to receive and diffuse at least the first part (41) of the light source light to provide diffuse light (9), a first polarization rotator element (10) being arranged between the polarization maintaining diffusing element (8) and the beam splitting element (7), the first polarization rotator element being configured to rotate the polarization of the diffuse light (9) to provide polarization rotated diffuse light (11), and a luminescent element (5) being arranged downstream of the first solid-state light source (3) and downstream of the beam splitting element (7), wherein the beam splitting element (7) further is (i) transmissive for the polarization rotated diffuse light (11), or (ii) reflective for the polarization rotated diffuse light (11), depending on the polarization of the polarization rotated diffused light, wherein the light generating system (100) further comprises an optical arrangement (15) arranged downstream of the beam splitting element (7), the optical arrangement (15) being configured to: (i) receive the polarization rotated diffuse light (11), (ii) reflect and rotate the polarization of at least a part of the polarization rotated diffuse light (11) to form reflected polarization rotated diffuse light (16), wherein2024PF8035826 the luminescent element (5) further is configured to receive and convert at least part of the reflected polarization rotated diffuse light (16) into first converted light (17), wherein the beam splitting element (7) further is (i) reflective for the reflected polarization rotated diffuse light (16) and reflective for the first converted light (17), or (ii) transmissive for the reflected polarization rotated diffuse light (16) and transmissive for the first converted light (17), in order to direct the reflected polarization rotated polarized diffuse light (16) towards the luminescent element (5) and to direct the first converted light (17) towards the optical arrangement (15), wherein the optical arrangement (15) further is configured to transmit at least part of the first converted light (17), and wherein, in an operational mode of the light generating system, the system light (2) comprises at least the first converted light (17).

2. A light generating system according to claim 1, wherein the beam splitting element (7) is configured to combine the first converted light (17) and the polarization rotated diffuse light (11), wherein the optical arrangement (15) being configured to transmit a part of the polarization rotated diffused light, and wherein, in an operational mode of the light generating system, the system light (2) comprises at least the first converted light (17) and the part of the polarization rotated diffused light (11).

3. A light generating system according to any one of the above claims, wherein: the beam splitting element (7) is (i) reflective for the first part (41) of the light source light and transmissive for a second part (42) of the light source light, or (ii) transmissive for the first part (41) of the light source light and reflective for the second part (42) of the light source light, depending on the polarization of the light source light, the luminescent element (5) is arranged and configured to receive and, at least partly, convert the second part (42) of the light source light into second converted light (6), the beam splitting element (7) further is (i) reflective for the second converted light (6) and transmissive for the polarization rotated diffuse light (11), or (ii) transmissive for the second converted light (6) and reflective for the polarization rotated diffuse light (11), the optical arrangement (15) further is configured to transmit at least part of the second converted light (6), and2024PF8035827 in an operational mode of the light generating system the system light (2) comprises the first converted light (17), the second converted light (6), and when depending on claim 2 the polarization rotated diffuse light (11).

4. A light generating system according to claim 3, wherein the beam splitting element (7) is configured to combine the first converted light (17), the second converted light (6) and the polarization rotated diffuse light (11), and wherein, in an operational mode of the light generating system, the system light (2) comprises the first converted light (17), the second converted light (6) and the polarization rotated diffuse light (11).

5. A light generating system according to any one of the above claims, wherein the optical arrangement (15) further is configured to reflect and rotate the polarization of a part of the first converted light (17) to form reflected polarization rotated first converted light (20), wherein the luminescent element (5) further is configured to receive and convert the reflected polarization rotated first converted light (20) into third converted light (21), wherein the beam splitting element (7) further is (i) reflective for the reflected polarization rotated first converted light (20) and reflective for the third converted light (21), or (ii) transmissive for the reflected polarization rotated first converted light (20) and transmissive for the third converted light (21), in order to direct the reflected polarization rotated first converted light (20) towards the luminescent element (5) and to direct the third converted light (21) towards the optical arrangement (15), wherein the optical arrangement (15) further is configured to transmit at least part of the third converted light (21), and wherein, in an operational mode of the light generating system, the system light (2) comprises the first converted light (17), the second converted light (6), when depending on claims 2 to 4 the polarization rotated diffuse light (11), and the third converted light (21).

6. A light generating system according to claim 5, wherein the beam splitting element (7) is configured to combine the first converted light (17), the second converted light (6), the third converted light (21), and the polarization rotated diffuse light (11).2024PF80358287. A light generating system according to any one of the above claims, wherein the optical arrangement (15) comprises a reflective polarizer or a polarization beam splitter being reflective for polarization rotated diffused light.

8. A light generating system according to any one of the above claims 1-6, wherein the optical arrangement (15) comprises a partially reflective element (18) and a second polarization rotator element (19) being arranged upstream of the partially reflective element (18).

9. A light generating system according to claim 7 or 8, wherein one or more of the following applies:(i) the reflectivity of the partially reflective element (18) is tunable for the polarization rotated diffused light,(ii) the partially reflective element (18) comprises a spatially varying reflectance for the polarization rotated diffused light, and the partially reflective element (18) is arranged and configured to be shiftable in position.

10. A light generating system according to any one of the above claims, wherein one or more of the following applies: the first polarization rotator element (10) is a quarter wavelength plate, and the second polarization rotator element (19) is a quarter wavelength plate.

11. A light generating system according to any one of the above claims, wherein the beam splitting element (7) comprises a polarizing beam splitting component and a direct beam splitting component, the direct beam splitting component comprises a dichroic mirror.

12. A light generating system according to any one of the above claims, and further comprising: a first optical element (12) arranged downstream of the solid-state light source and upstream the beam splitting element (7) and being configured to collimate the light source light (4), a second optical element (13) arranged downstream of the luminescent element (5) and upstream of the beam splitting element, the second optical element (13) being configured to: (i) focus one or more of the first part (41) of the light source light (4),2024PF8035829 the second part (41) of the light source light (4), the reflected polarization rotated diffuse light (16), and the reflected polarization rotated first converted light (20) on the first luminescent element (5) and (ii) collimate one or more of the first converted light (17), the second converted light (6) and the third converted light (21), and a third optical element (14) arranged downstream of the polarization maintaining diffusing element (8) and upstream of the first polarization rotator element (10), the third optical element (14) being configured to focus the first part (41) of the light source light on the polarization maintaining diffusing element (8) and (ii) collimate the diffuse light (9).

13. A light generating system according to any one of the above claims, wherein: the light source light (4) comprises a first peak emission wavelength, I, falling within the wavelength interval of 420 nm to 490 nm, the first converted light (17) comprises a second peak emission wavelength, X2, falling within the wavelength interval of 500 nm to 590 nm or 520 nm to 565 nm, the second converted light (6) comprises a third peak emission wavelength, X3, falling within the wavelength interval of 500 nm to 590 nm or 520 nm to 565 nm, and the third converted light (21) comprises a fourth peak emission wavelength, X4, falling within the wavelength interval of 520 nm to 600 nm or 540 nm to 590 nm.

14. A light generating system according to any one of the above claims, wherein the system light (2) is white light having one or more of a correlated color temperature, CCT, in a range of 2000 K to 9000 K, and a color rendering index of at least 80.

15. A lamp, a luminaire, a vehicle light, projection device, a search light, or a stage lighting device comprising a light generating system (100) according to any one of the above claims.

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