Light source device and optical imaging system

Abstract

The invention discloses a light source device and an optical imaging system. The first laser light source comprises a first laser module and a second laser module, the first laser module is used for generating first laser, and the second laser module is used for generating second laser. The second laser light source comprises a third laser module and a fourth laser module, the third laser module is used for generating third laser, and the fourth laser module is used for generating fourth laser. The first wavelength light combination unit is arranged on a light path where the first laser and the fourth laser are located and used for generating first mixed light. The second wavelength light combination unit is arranged on the light path where the second laser and the third laser are located and used for generating second mixed light. The polarization light combination module is arranged on a light path where the first mixed light and the second mixed light are located. According to the light source device in the embodiment, light combination is conducted on multiple paths of laser in the mode that wavelength light combination is conducted firstly and then polarization light combination is conducted, light spots of finally generated emergent light can be small, and the design difficulty and hardware cost of elements in a follow-up light path are reduced.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and more specifically, to a light source device and an optical imaging system. Background Art

[0002] At present, the main light source used in projection equipment is RGB laser light source, which has the advantages of high brightness, wide color gamut, good monochromaticity, etc. However, as the size of laser display projection becomes larger and larger, higher requirements are placed on the output energy of the laser.

[0003] In order to achieve higher energy output of laser light sources, researchers usually increase the number of laser arrays in the laser light source. However, if the light path design of the laser light source is unreasonable, it is easy to increase the size of the laser spot emitted by the laser light source, so that the caliber and thickness of the components in the subsequent light path (such as lenses, compound eyes, etc.) also need to be increased, which increases the hardware cost and design difficulty of the subsequent light path. Summary of the invention

[0004] Embodiments of the present application provide a light source device and an optical imaging system.

[0005] According to the first aspect of the present application, an embodiment of the present application provides a light source device, which may include a first laser light source, a second laser light source, a first wavelength light combining unit, a second wavelength light combining unit, and a polarization light combining module. The first laser light source includes a first laser module and a second laser module, the first laser module is used to generate a first laser, the second laser module is used to generate a second laser, and the first laser and the second laser are different colors. The second laser light source includes a third laser module and a fourth laser module, the third laser module is used to generate a third laser, the fourth laser module is used to generate a fourth laser, the third laser and the second laser are different colors, and the fourth laser and the first laser are different colors. The first wavelength light combining unit is arranged on the optical path where the first laser and the fourth laser are located, and is used to perform wavelength light combining on the first laser and the fourth laser to generate a first mixed light; the polarization state of the first mixed light is a first polarization state. The second wavelength light combining unit is arranged on the optical path where the second laser and the third laser are located, and is used to perform wavelength light combining on the second laser and the third laser to generate a second mixed light; the polarization state of the second mixed light is a second polarization state, and the second polarization state is different from the first polarization state. The polarization light combining module is arranged on the optical path where the first mixed light and the second mixed light are located, and is used for performing polarization light combining on the first mixed light and the second mixed light to generate output light.

[0006] According to the second aspect of the present application, an embodiment of the present application further provides an optical imaging system, which includes the above-mentioned light source device and a light modulator, wherein the light source device is used to generate outgoing light, and the light modulator is arranged on the light path where the outgoing light is located.

[0007] The present application provides a light source device and an optical imaging system, wherein the light source device includes a first laser light source, a second laser light source, a first wavelength light combining unit, a second wavelength light combining unit, and a polarization light combining module. The first laser module included in the first laser light source is used to generate a first laser, the second laser module included in the first laser light source is used to generate a second laser, the third laser module included in the second laser light source is used to generate a third laser, and the fourth laser module included in the second laser light source is used to generate a fourth laser. Specifically, the first laser and the second laser are of different colors, the third laser and the second laser are of different colors, and the fourth laser and the first laser are of different colors. For example, the first laser and the third laser can be a blue-green mixed laser, and the second laser and the fourth laser can be a red laser.

[0008] The first wavelength combining unit is used to combine the wavelengths of the first laser and the fourth laser to generate a first mixed light, and the polarization state of the first mixed light is the first polarization state. For example, when the fourth laser is a red laser and the first laser is a blue-green mixed laser, the first mixed light is a red, green and blue three-color mixed laser, and the polarization state of the first mixed light can be an S polarization state.

[0009] The second wavelength combining unit is used to combine the wavelengths of the second laser and the third laser to generate a second mixed light, and the polarization state of the second mixed light is different from the polarization state of the first mixed light. For example, when the second laser is a red laser and the third laser is a blue-green mixed laser, the second mixed light is a red, green and blue three-color mixed laser, and the polarization state of the second mixed light can be a P polarization state.

[0010] Finally, the polarization light combining module performs polarization light combining on the first mixed light and the second mixed light after the two wavelength light combining to generate output light. Since the polarization states of the two mixed lights are different, the two mixed lights can compensate each other in space, so that the light spot of the generated output light is smaller.

[0011] Therefore, the light source device in this embodiment combines multiple laser beams by combining wavelength light first and then polarization light, which can make the spot of the output light generated finally smaller, and reduce the design difficulty and hardware cost of the components in the subsequent optical path. Furthermore, since the polarization states of the two mixed lights in this embodiment are different, the coherence of the laser beam can be weakened, thereby reducing the contrast of the speckle in the output light, which is beneficial to improving the imaging quality of the optical imaging system provided with the light source device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 It is a schematic diagram of the structure of the light source device provided in an embodiment of the present application.

[0014] Figure 2 yes Figure 1 A schematic diagram of the arrangement of the first laser light source and the second laser light source.

[0015] Figure 3 yes Figure 1 A schematic diagram of the structure of the first laser light source.

[0016] Figure 4 yes Figure 1 Another structural schematic diagram of the first laser light source in FIG.

[0017] Figure 5 yes Figure 1 Another structural schematic diagram of the first laser light source in FIG.

[0018] Figure 6 yes Figure 1 Another schematic diagram of the arrangement of the first laser light source and the second laser light source.

[0019] Figure 7 yes Figure 1 Another schematic diagram of the arrangement of the first laser light source and the second laser light source.

[0020] Figure 8 yes Figure 1 A schematic diagram of another arrangement of the first laser light source and the second laser light source.

[0021] Fig. 9 yes Figure 1 Schematic cross-sectional view of the first wavelength light combining unit.

[0022] Fig.10 This is another structural schematic diagram of the light source device provided in an embodiment of the present application.

[0023] Fig.11 yes Figure 1 Schematic cross-sectional view of the second wavelength light combining unit.

[0024] Fig.12 This is another structural schematic diagram of the light source device provided in an embodiment of the present application.

[0025] Fig.13 This is another structural schematic diagram of the light source device provided in the embodiment of the present application.

[0026] Fig.14 It is a schematic diagram of the structure of the optical imaging system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0028] The embodiment of the present application provides a light source device 100, which is a hybrid light source that combines multiple lasers. The light source device 100 has the advantages of high light source brightness, simple optical path and low hardware cost. It can be widely used in projection equipment (for example, micro projectors, short-focus projectors, car projectors), laser TVs, engineering projectors, laser wall splicing and other equipment. Preferably, the light source device 100 can be an integrated packaging structure, and the packaging structure can be provided with a light outlet (not shown in the figure), and the light outlet is used to emit the output light O. Since the light source device 100 is an integrated packaging structure, it can match a variety of product scenarios, has strong flexibility, and helps to reduce the product development cycle. Furthermore, modularizing the light source device 100 also helps to reduce the difficulty of installing the light source device 100.

[0029] See also Figure 1 and Figure 2 , the light source device 100 in this embodiment may include a first laser light source 10, a second laser light source 20, a first wavelength light combining unit 30, a second wavelength light combining unit 40 and a polarization light combining module 50. Among them, the first laser light source 10 may include a first laser module 120 and a second laser module 140, the first laser module 120 is used to generate a first laser L1, the second laser module 140 is used to generate a second laser L2, and the first laser L1 and the second laser L2 are different colors. For example, the first laser L1 may be a green laser, a blue laser, or a blue-green mixed laser. The second laser L2 may be a red laser, or other lasers with different colors from the first laser L1. The colors of the first laser L1 and the second laser L2 are not specifically limited in this embodiment.

[0030] The second laser light source 20 may include a third laser module 210 and a fourth laser module 230. The third laser module 210 is used to generate a third laser L3. The fourth laser module 230 is used to generate a fourth laser L4. The third laser L3 and the second laser L2 are different colors. The fourth laser L4 and the first laser L1 are different colors. For example, the third laser L3 may be a green laser, a blue laser, or a blue-green mixed laser. The fourth laser L4 may be a red laser, or other lasers with different colors from the third laser L3. The colors of the third laser L3 and the fourth laser L4 are not specifically limited in this embodiment.

[0031] The first wavelength combining unit 30 is disposed on the optical path where the first laser L1 and the fourth laser L4 are located, and is used to combine the wavelengths of the first laser L1 and the fourth laser L4 to generate a first mixed light H1. The polarization state of the first mixed light H1 is a first polarization state. The second wavelength combining unit 40 is disposed on the optical path where the second laser L2 and the third laser L3 are located, and is used to combine the wavelengths of the second laser L2 and the third laser L3 to generate a second mixed light H2. The polarization state of the second mixed light H2 is a second polarization state, and the second polarization state is different from the first polarization state.

[0032] Specifically, the second polarization state and the first polarization state are two mutually orthogonal polarization states. For example, when the first laser L1 is a blue-green mixed laser and the fourth laser L4 is a red laser, the first mixed light H1 is a red, green and blue three-color mixed laser, and the polarization state of the first mixed light H1 can be an S polarization state. When the second laser L2 is a red laser and the third laser L3 is a blue-green mixed laser, the second mixed light H2 is a red, green and blue three-color mixed laser, and the polarization state of the second mixed light H2 can be a P polarization state. Of course, in some other possible embodiments, the polarization state of the first mixed light H1 can be a P polarization state, and the polarization state of the second mixed light H2 can be an S polarization state.

[0033] The polarization light combining module 50 is disposed on the optical path of the first mixed light H1 and the second mixed light H2, and is used to perform polarization light combining on the first mixed light H1 and the second mixed light H2 to generate output light O. Since the polarization states of the two mixed lights are different, the two mixed lights can compensate each other in space, so that the light spot of the generated output light O is smaller.

[0034] Therefore, the light source device 100 in this embodiment combines multiple laser beams by combining wavelength light first and then polarization light, which can make the spot of the output light O generated finally smaller, and reduce the design difficulty and hardware cost of the components in the subsequent optical path. Furthermore, since the polarization states of the two mixed lights in this embodiment are different, the coherence of the laser beam can be weakened, thereby reducing the contrast of the speckle in the output light O, which is beneficial to improving the imaging quality of the optical imaging system provided with the light source device 100.

[0035] The various components in the light source device 100 are introduced below.

[0036] In this embodiment, the first laser light source 10 may include a first laser module 120 and a second laser module 140. Specifically, the first laser module 120 and the second laser module 140 may be packaged in the same laser to form the first laser light source 10.

[0037] The first laser module 120 is used to generate a first laser L1. In this embodiment, the first laser L1 may be a blue-green mixed laser. Figure 2 and Figure 3 , the first laser module 120 may include a first laser unit 1210 and a second laser unit 1230, the first laser unit 1210 is used to generate a first sub-laser L11, and the second laser unit 1230 is used to generate a second sub-laser L12. The wavelengths of the second laser L2, the first sub-laser L11, and the second sub-laser L12 are different from each other. The "wavelengths are different from each other" here means that the second laser L2, the first sub-laser L11, and the second sub-laser L12 are respectively in the wavelength bands corresponding to lights of different colors. For example, the first sub-laser L11 may be a green laser, the second sub-laser L12 may be a blue laser, and the second laser L2 may be a red laser. In some other possible embodiments, the first laser L1 may also be a single color of light, or a laser mixed with multiple other colors of light, which is not specifically limited in this embodiment.

[0038] Specifically, the first laser unit 1210 may include a plurality of first laser subunits 1212, which are arranged at intervals in the first specified direction W to jointly generate the first sub-laser L11. The number of the first laser subunits 1212 may be 2, 3, 6, 8, etc. The second laser unit 1230 may include a plurality of second laser subunits 1232, which are arranged at intervals in the first specified direction W to jointly generate the second sub-laser L12. The number of the second laser subunits 1232 may be 2, 3, 4, 5, etc.

[0039] In some possible embodiments, see Figure 3 and Figure 4 The first laser unit 1210 and the second laser unit 1230 may be arranged at intervals in the first designated direction W, so that the plurality of first laser sub-units 1212 included in the first laser unit 1210 and the plurality of second laser sub-units 1232 included in the second laser unit 1230 are located in the same column and are arranged at intervals.

[0040] In some other possible embodiments, see Figure 5 , the first laser unit 1210 and the second laser unit 1230 may be arranged in a spaced relationship in a second designated direction H, so that the first laser subunits 1212 included in the first laser unit 1210 and the second laser subunits 1232 included in the second laser unit 1230 are respectively located in two columns and spaced from each other. The second designated direction H is perpendicular to the first designated direction W.

[0041] The second laser module 140 is used to generate a second laser L2, and the second laser L2 and the first laser L1 are different colors. "Different colors" here means that the second laser L2 and the first laser L1 are in the bands corresponding to different colors of light, for example, the first laser L1 can be in the band where blue light and green light are located (for example, 440nm to 580nm), and the second laser L2 can be in the band where red light is located (for example, 625nm to 740nm). In this embodiment, the second laser L2 can be a red laser. In some other possible embodiments, the second laser L2 can also be light of other single colors, or light mixed by multiple colors of light, which is not specifically limited in this embodiment.

[0042] Specifically, the second laser module 140 and the first laser module 120 are arranged at intervals in the second designated direction H. The second laser module 140 may include a plurality of third laser subunits 1400, which are arranged at intervals in the first designated direction W to jointly generate the second laser L2. The number of the third laser subunits 1400 may be 4, 6, 8, etc. Figure 3 and Figure 4 In the illustrated embodiment, the plurality of third laser sub-units 1400 are arranged in a single row and are spaced apart from the single row of the plurality of first laser sub-units 1212 and the plurality of second laser sub-units 1232 in the second specified direction H. Therefore, the first laser light source 10 in this embodiment is an RGB three-color laser light source, and the RGB three-color laser adopts an asymmetric packaging method. Figure 5 In the illustrated embodiment, the plurality of third laser sub-units 1400 are arranged in two rows and are spaced apart from the two rows of the plurality of first laser sub-units 1212 and the plurality of second laser sub-units 1232 in the second designated direction H, that is, the second laser module 140, the second laser unit 1230 and the first laser unit 1210 are sequentially spaced apart in the second designated direction H. This embodiment does not limit the number of the laser sub-units and the specific arrangement thereof.

[0043] In this embodiment, the second laser light source 20 may include a third laser module 210 and a fourth laser module 230. Specifically, the third laser module 210 and the fourth laser module 230 may be packaged in the same laser to form the second laser light source 20. The third laser L3 generated by the third laser module 210 is the same color as the third laser L1 generated by the first laser module, and the fourth laser L4 generated by the fourth laser module 230 is the same color as the second laser L2 generated by the second laser module. The "same color" here means that the third laser L3 and the first laser L1 are in the same band, and the fourth laser L4 and the second laser L2 are in the same band. For example, the third laser L3 and the first laser L1 may both be in the band where blue light and green light are located (for example, 440nm to 580nm), and the fourth laser L4 and the second laser L2 may both be in the band where red light is located (for example, 625nm to 740nm). Therefore, in this embodiment, the first laser L1 and the third laser L3 are both blue-green mixed lasers, and the second laser L2 and the fourth laser L4 are both red lasers. That is, in this embodiment, the third laser light L3 and the second laser light L2 are different colors, and the fourth laser light L4 and the first laser light L1 are different colors.

[0044] In some possible embodiments, the number and arrangement of the laser subunits in the second laser light source 20 and the first laser light source 10 may be the same, that is, the second laser light source 20 and the first laser light source 10 are two laser generators with the same structure, thereby saving the hardware cost of the light source device 100. Therefore, the features of the second laser light source 20 may refer to and follow the features of the first laser light source 10, and will not be described one by one here to save space.

[0045] Specifically, the third laser module 210 may include a third laser unit 2100 and a fourth laser unit 2120. The third laser unit 2100 is used to generate a third sub-laser L31, and the fourth laser unit 2120 is used to generate a fourth sub-laser L32. The third sub-laser L31 is the same color as the first sub-laser L11, the fourth sub-laser L32 is the same color as the second sub-laser L12, and the fourth laser L4 is the same color as the second laser L2. The features of the third laser unit 2100 may refer to and follow the features of the first laser unit 1210, and the features of the fourth laser unit 2120 may refer to and follow the features of the second laser unit 1230. To save space, they will not be described one by one here.

[0046] In some other possible embodiments, the number or arrangement of the laser subunits in the second laser light source 20 and the first laser light source 10 may be different. Figure 3In the illustrated embodiment, the first laser module 120 in the first laser light source 10 is located on the left, the second laser module 140 is located on the right, and the first laser unit 1210 is located above the second laser unit 1230. In the second laser light source 20, the third laser module 210 is located on the left, the fourth laser module 230 is located on the right, and the fourth laser unit 2120 can be located above the third laser unit 2100. Therefore, the arrangement of the laser subunits in the first laser light source 10 and the second laser light source 20 is different. Specifically, the number and arrangement of each laser subunit in the second laser light source 20 and the first laser light source 10 can be determined according to the specific implementation and placement of the first wavelength light combining unit 30, the second wavelength light combining unit 40 and the polarization light combining module 50, which is not specifically limited in this embodiment.

[0047] In this embodiment, the second laser light source 20 and the first laser light source 10 are placed perpendicular to each other. Figure 2 , the emission directions of the first laser L1 and the second laser L2 are respectively perpendicular to the first plane P1, the emission directions of the third laser L3 and the fourth laser L4 are respectively perpendicular to the second plane P2, and the first plane P1 and the second plane P2 are perpendicular to each other. It should be noted here that "the first plane P1 and the second plane P2" are only geometric features used to describe the relative positional relationship between the second laser light source 20 and the first laser light source 10. In the actual structure of the second laser light source 20 and the first laser light source 10, there may be no physical first plane P1 and second plane P2.

[0048] The light source device 100 in this embodiment can make the overall optical path structure of the light source device 100 more compact by vertically placing the second laser light source 20 and the first laser light source 10. On the other hand, when multiple lasers are combined, vertical placement can also achieve symmetrical optical distribution. The specific placement of the second laser light source 20 and the first laser light source 10 is described below.

[0049] In some possible embodiments, the first laser L1 and the fourth laser L4 jointly define a first laser reference plane. The second laser L2 and the third laser L3 jointly define a second laser reference plane, and the first laser reference plane and the second laser reference plane are parallel. It should be noted here that the first laser L1 and the fourth laser L4 in "the first laser L1 and the fourth laser L4 jointly define the first laser reference plane" refer to two light beams that have not been propagated to the first wavelength light combining module 30, and the above two light beams are both located in the same plane (that is, the first laser reference plane). Similarly, it can be known that the second laser L2 and the third laser L3 in "the second laser L2 and the third laser L3 jointly define the second laser reference plane" refer to two light beams that have not been propagated to the second wavelength light combining module 40, and the above two light beams are both located in the same plane (that is, the second laser reference plane). Since the first laser reference plane and the second laser reference plane are parallel, the first laser L1 and the fourth laser L4 can be combined on the same side, and the second laser L2 and the third laser L3 can be combined on the other side, so that the two groups of light can be combined independently.

[0050] Specifically, the first laser module 120 and the second laser module 140 are arranged at intervals in the first direction A1, and the third laser module 210 and the fourth laser module 230 are arranged at intervals in the first direction A1. The first direction A1 is parallel to the first plane P1 and the second plane P2, respectively. It is not difficult to understand here that the first direction A1 is in the same direction as the second designated direction H mentioned above.

[0051] exist Figure 2 In the embodiment shown, the first laser light source 10 can be Figure 3 or Figure 4 Specifically, the first laser unit 1210 and the second laser unit 1230 are spaced apart in the second direction A2, and the third laser unit 2100 and the fourth laser unit 2120 are spaced apart in the third direction A3. The second direction A2 is parallel to the first plane P1 and perpendicular to the first direction A1. The third direction A3 is parallel to the second plane P2 and perpendicular to the first direction A1, that is, the first direction A1, the second direction A2 and the third direction A3 are perpendicular to each other. It is not difficult to understand here that the second direction A2 is in the same direction as the first designated direction W corresponding to the first laser light source 10, and the third direction A3 is in the same direction as the first designated direction W corresponding to the second laser light source 20.

[0052] As an implementation method, Figure 2In the illustrated embodiment, the first laser unit 1210 is located on the side of the second laser unit 1230 away from the first designated axis (not shown in the figure), and the third laser unit 2100 is located on the side of the fourth laser unit 2120 away from the first designated axis, so that the two laser units for generating blue laser light in the two laser light sources are arranged close to the first designated axis. The first designated axis is the intersection of the first plane P1 and the second plane P2. Therefore, Figure 2 The arrangement of the laser sub-units in the first laser light source 10 and the second laser light source 20 is the same. The first laser light source 10 and the second laser light source 20 can be two laser generators with the same structure, thereby saving the hardware cost of the light source device 100.

[0053] As another embodiment, the second laser unit 1230 is located on the side of the first laser unit 1210 away from the first designated axis, and the fourth laser unit 2120 is located on the side of the third laser unit 2100 away from the first designated axis, so that the two laser units for generating green laser light in the two laser light sources are arranged close to the first designated axis. The first designated axis is the intersection of the first plane P1 and the second plane P2. Therefore, the arrangement of the laser subunits in the first laser light source 10 and the second laser light source 20 in this embodiment is the same, and the first laser light source 10 and the second laser light source 20 can be two laser generators with the same structure, thereby saving the hardware cost of the light source device 100.

[0054] As another embodiment, the first laser unit 1210 is located on the side of the second laser unit 1230 away from the first designated axis, and the fourth laser unit 2120 is located on the side of the third laser unit 2100 away from the first designated axis. Alternatively, the second laser unit 1230 is located on the side of the first laser unit 1210 away from the first designated axis, and the third laser unit 2100 is located on the side of the fourth laser unit 2120 away from the first designated axis. Therefore, the arrangement of the laser sub-units in the first laser light source 10 and the second laser light source 20 in this embodiment is different.

[0055] See also Figure 6 The first laser light source 10 can be Figure 5As an embodiment, the first laser unit 1210, the second laser unit 1230 and the second laser module 140 are sequentially arranged at intervals in the first direction A1, and the fourth laser module 230, the fourth laser unit 2120 and the third laser unit 2100 are sequentially arranged at intervals in the first direction A1. Specifically, the distance between the first laser unit 1210 and the fourth laser module 230 is smaller than the distance between the first laser unit 1210 and the third laser unit 2100, so that the first laser unit 1210, the second laser unit 1230 and the fourth laser module 230 are located on one side, and the second laser module 140, the fourth laser unit 2120 and the third laser unit 2100 are located on the other side, so as to facilitate the subsequent smooth wavelength combination.

[0056] As another embodiment, the second laser unit 1230, the first laser unit 1210, and the second laser module 140 are sequentially arranged at intervals in the first direction A1, and the fourth laser module 230, the third laser unit 2100, and the fourth laser unit 2120 are sequentially arranged at intervals in the first direction A1. Specifically, the distance between the second laser unit 1230 and the fourth laser module 230 is smaller than the distance between the second laser unit 1230 and the fourth laser unit 2120.

[0057] In some other possible embodiments, the first laser module 120 and the second laser module 140 are spaced apart in the fourth direction B1, and the third laser module 210 and the fourth laser module 230 are spaced apart in the fifth direction B2. The fourth direction B1 is parallel to the first plane P1 and perpendicular to the second plane P2, and the fifth direction B2 is parallel to the second plane P2 and perpendicular to the first plane P1. It is not difficult to understand that the fourth direction B1 is in the same direction as the second designated direction H corresponding to the first laser light source 10, and the fifth direction B2 is in the same direction as the second designated direction H corresponding to the second laser light source 20.

[0058] See also Figure 7 The first laser light source 10 can be Figure 3 or Figure 4 Specifically, the second laser module 140 is located on the side of the first laser module 120 away from the second designated axis (not shown in the figure), and the fourth laser module 230 is located on the side of the third laser module 210 away from the second designated axis, and the second designated axis is the intersection of the first plane P1 and the second plane P2. In some other possible embodiments, the first laser module 120 is located on the side of the second laser module 140 away from the second designated axis, and the third laser module 210 is located on the side of the fourth laser module 230 away from the second designated axis.

[0059] exist Figure 7In the illustrated embodiment, the first laser unit 1210 and the second laser unit 1230 are spaced apart in the sixth direction B3, and the sixth direction B3 is parallel to the first plane P1 and perpendicular to the fourth direction B1. It is not difficult to understand here that the sixth direction B3 is in the same direction as the first designated direction W mentioned above. The third laser unit 2100 and the fourth laser unit 2120 are spaced apart in the sixth direction B3. Specifically, the second laser unit 1230 and the first laser unit 1210 can be spaced apart in the positive direction of the sixth direction B3, and the third laser unit 2100 and the fourth laser unit 2120 can be spaced apart in the positive direction of the sixth direction B3, wherein the “positive direction of the sixth direction B3” refers to Figure 7 Therefore, the arrangement of the laser subunits in the first laser light source 10 and the second laser light source 20 in this embodiment is the same, and the first laser light source 10 and the second laser light source 20 can be two laser generators with the same structure, thereby saving the hardware cost of the light source device 100.

[0060] As another embodiment, the second laser unit 1230 and the first laser unit 1210 may be arranged at intervals along the positive direction of the sixth direction B3, and the fourth laser unit 2120 and the third laser unit 2100 may be arranged at intervals along the positive direction of the sixth direction B3. Therefore, the arrangement of the laser subunits in the first laser light source 10 and the second laser light source 20 in this embodiment is different.

[0061] See also Figure 8 The first laser light source 10 can be Figure 5 Specifically, the first laser unit 1210, the second laser unit 1230, and the second laser module 140 are sequentially arranged at intervals in the fourth direction B1. The third laser unit 2100, the fourth laser unit 2120, and the fourth laser module 230 are sequentially arranged at intervals in the fifth direction B2. Specifically, the distance between the first laser unit 1210 and the fourth laser module 230 is greater than the distance between the first laser unit 1210 and the third laser unit 2100.

[0062] As another embodiment, the second laser unit 1230, the first laser unit 1210, and the second laser module 140 are sequentially arranged in intervals in the fourth direction B1. The fourth laser unit 2120, the third laser unit 2100, and the fourth laser module 230 are sequentially arranged in intervals in the fifth direction B2. Specifically, the distance between the second laser unit 1230 and the fourth laser module 230 is greater than the distance between the second laser unit 1230 and the third laser unit 2100.

[0063] In the present embodiment, the first wavelength combining unit 30 is disposed on the optical path where the first laser L1 and the fourth laser L4 are located, and is used to perform wavelength combining on the first laser L1 and the fourth laser L4 to generate a first mixed light H1. The polarization state of the first mixed light H1 is a first polarization state. For example, the first wavelength combining unit 30 can reflect the first laser L1 and transmit the fourth laser L4 to achieve wavelength combining. For another example, the first wavelength combining unit 30 can transmit the first laser L1 and reflect the fourth laser L4 to achieve wavelength combining. The first polarization state in the present embodiment is a linear polarization state. For example, the first polarization state can be a P polarization state or an S polarization state.

[0064] See also Fig. 9 The first wavelength combining unit 30 may include a first body 320 and a first wavelength combining layer 340. The first wavelength combining layer 340 is disposed on the first body 320 and is used to combine the wavelengths of the first laser L1 and the fourth laser L4. Specifically, the first wavelength combining layer 340 may be a wavelength combining film, which may be coated on the surface of the first body 320 using a coating process.

[0065] In some possible embodiments, the first laser light source 10 and the second laser light source 20 are Figure 2 or Figure 6 In this case, if Figure 1 As shown, the first wavelength light combining unit 30 is arranged on the optical path where the first laser L1 and the fourth laser L4 are located, the angle between the plane where the first body 320 is located and the first plane P1 can be 45 degrees, and the angle between the plane where the first body 320 is located and the second plane P2 can be 45 degrees. The first wavelength light combining layer 340 can be a wavelength light combining film that transmits red light and reflects blue-green light. Of course, in other examples, the first wavelength light combining layer 340 can be a wavelength light combining film that transmits blue-green light and reflects red light.

[0066] In some other possible embodiments, the first laser light source 10 and the second laser light source 20 are Figure 7 or Figure 8 In this case, refer to Fig.10 The first wavelength combining unit 30 is disposed on the optical path of the first laser L1 and the fourth laser L4, the angle between the plane where the first body 320 is located and the first plane P1 can be 45 degrees, and the angle between the plane where the first body 320 is located and the second plane P2 can be 45 degrees. The first wavelength combining layer 340 can be a wavelength combining film that transmits red light and reflects blue-green light.

[0067] In the present embodiment, the second wavelength combining unit 40 is arranged on the optical path where the second laser L2 and the third laser L3 are located, and is used to perform wavelength combining on the second laser L2 and the third laser L3 to generate a second mixed light H2. Among them, the polarization state of the second mixed light H2 is a second polarization state, and the second polarization state is different from the first polarization state. For example, the second wavelength combining unit 40 can reflect the second laser L2 and transmit the third laser L3 to achieve wavelength combining. For another example, the second wavelength combining unit 40 can transmit the second laser L2 and reflect the third laser L3 to achieve wavelength combining. The second polarization state in the present embodiment is a linear polarization state, and the second polarization state and the first polarization state are orthogonal to each other. For example, when the first polarization state is a P polarization state, the second polarization state can be an S polarization state; when the first polarization state is an S polarization state, the second polarization state can be a P polarization state.

[0068] See also Fig.11 The second wavelength combining unit 40 may include a second body 410 and a second wavelength combining layer 430. The second wavelength combining layer 430 is disposed on the second body 410 and is used to combine the wavelengths of the second laser L2 and the third laser L3. Specifically, the second wavelength combining layer 430 may be a wavelength combining film, which may be coated on the surface of the second body 410 using a coating process.

[0069] In some possible embodiments, the first laser light source 10 and the second laser light source 20 are Figure 2 or Figure 6 In this case, if Figure 1 As shown, the second wavelength light combining unit 40 is arranged on the optical path where the second laser L2 and the third laser L3 are located, the angle between the plane where the second body 410 is located and the first plane P1 can be 45 degrees, and the angle between the plane where the second body 410 is located and the second plane P2 can be 45 degrees. The second wavelength light combining unit 40 can be a wavelength light combining film that transmits blue-green light and reflects red light. Of course, in other examples, the second wavelength light combining unit 40 can be a wavelength light combining film that transmits red light and reflects blue-green light.

[0070] exist Figure 1 In the illustrated embodiment, the second body 410 and the first body 320 may be coplanar. For example, the second body 410 and the first body 320 may be an integrally formed structure, that is, the first wavelength light combining layer 340 and the second wavelength light combining layer 430 may be plated on the same substrate (e.g., a lens) to form the first wavelength light combining unit 30 and the second wavelength light combining unit 40, respectively, thereby reducing the hardware processing cost of the first wavelength light combining unit 30 and the second wavelength light combining unit 40. For another example, the second body 410 and the first body 320 may also be two different lenses, and the two lenses are coplanar.

[0071] exist Figure 1 In the illustrated embodiment, the second wavelength light combining layer 430 and the first wavelength light combining layer 340 have different transmittance and reflectance characteristics, so that the second mixed light H2 emitted from the second wavelength light combining layer 430 and the first mixed light H1 emitted from the first wavelength light combining layer 340 can be emitted in the same direction, and the two mixed lights are parallel, so that the subsequent polarization light combining module 50 can smoothly combine the two mixed lights.

[0072] In some other possible embodiments, the first laser light source 10 and the second laser light source 20 are Figure 7 or Figure 8 In this case, if Fig.10 As shown, the second wavelength light combining unit 40 is arranged on the optical path where the second laser L2 and the third laser L3 are located, the angle between the plane where the second body 410 is located and the first plane P1 can be 45 degrees, and the angle between the plane where the second body 410 is located and the second plane P2 can be 45 degrees. The second wavelength light combining layer 430 can be a wavelength light combining film that transmits red light and reflects blue-green light.

[0073] exist Fig.10 In the illustrated embodiment, the second wavelength light combining layer 430 and the first wavelength light combining layer 340 have the same transmissive and reflective characteristics, so that the second mixed light H2 emitted from the second wavelength light combining layer 430 and the first mixed light H1 emitted from the first wavelength light combining layer 340 are perpendicular to each other, so that the subsequent polarization light combining module 50 can smoothly combine the two mixed lights. In addition, since the second wavelength light combining layer 430 and the first wavelength light combining layer 340 have the same transmissive and reflective characteristics, the first wavelength light combining unit 30 and the second wavelength light combining unit 40 can be two identical wavelength light combining elements, thereby saving the hardware cost of the light source device 100.

[0074] In this embodiment, the polarization light combining module 50 is disposed on the optical path where the first mixed light H1 and the second mixed light H2 are located, and is used to perform polarization light combining on the first mixed light H1 and the second mixed light H2 to generate the output light O. For example, the polarization light combining module 50 can reflect the first mixed light H1 and transmit the second mixed light H2 to achieve polarization light combining. For another example, the polarization light combining module 50 can transmit the first mixed light H1 and reflect the second mixed light H2 to achieve polarization light combining.

[0075] In some possible embodiments, the first laser light source 10 and the second laser light source 20 are Figure 2 or Figure 6In this case, the first mixed light H1 and the second mixed light H2 are parallel, and the polarization light combining module 50 may include a reflection unit 520 and a first polarization light combining unit 540. The reflection unit 520 is disposed on the optical path where one of the light rays in the first mixed light H1 and the second mixed light H2 is located, and is used to reflect the light incident to the reflection unit 520 to generate reflected light. The first polarization light combining unit 540 is disposed on the optical path where the other light ray in the first mixed light H1 and the second mixed light H2 and the reflected light are located, and is used to perform polarization light combining to generate output light O.

[0076] As an implementation, please refer again to Figure 1 The reflection unit 520 can be disposed on the optical path of the first mixed light H1, and is used to reflect the first mixed light H1 toward one side of the second mixed light H2. The first polarization light combining unit 540 is disposed on the optical path of the second mixed light H2 and the first mixed light H1 reflected by the reflection unit 520, and is used to perform polarization light combining to generate the output light O.

[0077] As another implementation, see Fig.12 , the reflection unit 520 can be arranged on the optical path where the second mixed light H2 is located, and is used to reflect the second mixed light H2 toward one side of the first mixed light H1. The first polarized light combining unit 540 is arranged on the optical path where the first mixed light H1 and the second mixed light H2 reflected by the reflection unit 520 are located, and is used to perform polarized light combining to generate the output light O. Specifically, in the present embodiment, the first mixed light H1 and the second mixed light H2 are incident on the first polarized light combining unit 540 at an angle of 45 degrees, and the polarization state of the first mixed light H1 is the S polarization state, and the polarization state of the second mixed light H2 is the P polarization state. Therefore, in order to meet the specified Brewster angle, the first polarized light combining unit 540 is a light combining device that transmits laser light in the P polarization state and reflects laser light in the S polarization state.

[0078] Here is Figure 1 The polarization states of the first laser L1, the second laser L2, the third laser L3 and the fourth laser L4 are explained. Here, taking the first polarization state as the S polarization state and the second polarization state as the P polarization state as an example, the first polarization light combining unit 540 is provided with a first polarization light combining plane 5400, and the plane where the first polarization light combining plane 5400 is located is perpendicular to the first plane P1 and intersects with the second plane P2. Therefore, the polarization state of the first laser L1 and the fourth laser L4 relative to the first polarization light combining plane 5400 is the first polarization state (that is, the S polarization state). The polarization state of the second laser L2 and the third laser L3 relative to the first polarization light combining plane 5400 is the second polarization state (that is, the P polarization state).

[0079] When the first laser L1 and the second laser L2 are emitted from the first laser light source 10, the first laser L1 and the second laser L2 are respectively parallel to the first polarization combining plane 5400. Therefore, the first laser L1 is in a P polarization state relative to the plane where the first wavelength combining unit 30 is located, and the second laser L2 is in an S polarization state relative to the plane where the second wavelength combining unit 40 is located. Since the plane where the first wavelength combining unit 30 is located and the plane where the second wavelength combining unit 40 is located are coplanar or parallel. Therefore, relative to the plane where the first wavelength combining unit 30 is located, the polarization state of the first laser L1 is the same as the polarization state of the third laser L3, and the polarization state of the second laser L2 is the same as the polarization state of the fourth laser L4.

[0080] That is to say, Figure 1 In the embodiment shown, the first laser light source 10 and the second laser light source 20 can be implemented by using two lasers with completely identical structures and laser characteristics. Figure 1 The arrangement shown can combine multiple lasers by combining wavelengths first and then polarization. In addition, the same-color light in the two laser light sources can be combined on the same axis during polarization combination, which makes the light spot of the light emitted after polarization combination smaller, reducing the design difficulty and hardware cost of the components in the subsequent optical path.

[0081] In some other possible embodiments, the first laser light source 10 and the second laser light source 20 are Figure 7 In this case, the first mixed light H1 and the second mixed light H2 are perpendicular to each other. Fig.10 The light source device 100 may further include a polarization conversion unit 60 , and the polarization light combining module 50 may include a second polarization light combining unit 560 .

[0082] The polarization conversion unit 60 is disposed on the optical path of the two laser beams generated by any one of the first laser light source 10 and the second laser light source 20, and is used to convert the polarization states of the two laser beams. Fig.10 In the illustrated embodiment, the polarization conversion unit 60 is disposed on the optical path where the first laser L1 and the second laser L2 generated by the first laser light source 10 are located, and is used to convert the polarization states of the first laser L1 and the second laser L2. For example, the polarization conversion unit 60 can convert the laser light in the P polarization state into the laser light in the S polarization state; or it can convert the laser light in the S polarization state into the laser light in the P polarization state. Specifically, the polarization conversion unit 60 can be a half-wave plate. In some other possible embodiments, the polarization conversion unit 60 can also be disposed on the optical path where the third laser L3 and the fourth laser L4 generated by the second laser light source 20 are located.

[0083] The second polarization light combining unit 560 is disposed on the optical path where the first mixed light H1 and the second mixed light H2 are located, and is used to perform polarization light combining to generate an output light O. Specifically, in the present embodiment, the first mixed light H1 and the second mixed light H2 are incident on the second polarization light combining unit 560 at an angle of 45 degrees, and the polarization state of the first mixed light H1 is the S polarization state, and the polarization state of the second mixed light H2 is the P polarization state. Therefore, in order to meet the specified Brewster angle, the second polarization light combining unit 560 is a light combining device that transmits laser light in the P polarization state and reflects laser light in the S polarization state.

[0084] Here is Fig.10 : The polarization states of the first laser L1, the second laser L2, the third laser L3 and the fourth laser L4 are explained. Here, taking the first polarization state as the S polarization state and the second polarization state as the P polarization state as an example, the second polarization light combining unit 560 is provided with a second polarization light combining plane 5600, and the plane where the second polarization light combining plane 5600 is located intersects with the first plane P1 and the second plane P2 respectively. Therefore, the polarization state of the first laser L1 and the third laser L3 relative to the second polarization light combining plane 5600 is the second polarization state (that is, the P polarization state). The polarization state of the second laser L2 and the fourth laser L4 relative to the second polarization light combining plane 5600 is the first polarization state (that is, the S polarization state).

[0085] It is not difficult to understand here that the first laser L1 in the P polarization state will be converted into the first laser L1 in the S polarization state after passing through the polarization conversion unit 60, and the first laser L1 in the S polarization state and the fourth laser L4 in the S polarization state will form the first mixed light H1 in the S polarization state after wavelength combination at the first wavelength combination unit 30. Similarly, the second laser L2 in the S polarization state will be converted into the second laser L2 in the P polarization state after passing through the polarization conversion unit 60, and the second laser L2 in the P polarization state and the third laser L3 in the P polarization state will form the second mixed light H2 in the P polarization state after wavelength combination at the second wavelength combination unit 40.

[0086] Therefore, relative to the plane where the second polarization light combining surface 5600 is located, the polarization state of the first laser L1 is the same as the polarization state of the third laser L3, and the polarization state of the second laser L2 is the same as the polarization state of the fourth laser L4. Figure 1 In the embodiment shown, the first laser light source 10 and the second laser light source 20 can be implemented by using two lasers with completely identical structures and laser characteristics. Figure 1 The arrangement shown can combine multiple lasers by combining wavelengths first and then polarization. In addition, the same-color light in the two laser light sources can be combined on the same axis during polarization combination, which makes the light spot of the light emitted after polarization combination smaller, reducing the design difficulty and hardware cost of the components in the subsequent optical path.

[0087] In addition, and Fig.10 Compared with the optical path structure shown in Figure 1 There is no need to set the polarization conversion unit 60 in the optical path structure shown in , which can further save the hardware cost of the light source device 100.

[0088] In some other possible embodiments, the first laser light source 10 and the second laser light source 20 are Figure 8 In this case, the first mixed light H1 and the second mixed light H2 are perpendicular to each other. Fig.13 , Fig.13 The optical path structure and Fig.10 The optical path structure shown is the same, and the specific introduction can refer to the relevant description above, which will not be repeated here. Fig.13 It is not difficult to see that, due to the symmetrical optical arrangement of the first laser light source 10 and the second laser light source 20 in space, the optical paths of the first sub-laser L11, the second sub-laser L12, the third sub-laser L31, the fourth sub-laser L32, the second laser L2 and the fourth laser L4 reaching the wavelength combination module 50 are roughly equal, reducing the impact of the change in the optical path on the light spot size. In addition, the spot size of the output light O is roughly the same as the spot size of the first laser L1, the second laser L2, the third laser L3 and the fourth laser L4, respectively, so that the spot of the output light O generated in the end is smaller, reducing the design difficulty and hardware cost of the components in the subsequent optical path.

[0089] See also Fig.13 The present application also provides an optical imaging system 900, which is provided with the above-mentioned light source device 100, and can be widely used in projection equipment (for example, micro projectors, short-throw projectors, vehicle-mounted projectors), laser TVs, engineering projectors, laser mosaic walls and other equipment. Fig.13 The optical imaging system 900 may include a light source device 100 , a lens module 910 , a prism module 920 and a light modulator 930 .

[0090] The light source device 100 is used to generate an outgoing light O. The specific structure of the light source device 100 can refer to the relevant introduction in the above embodiment, and will not be repeated here. The lens module 910 is arranged on the optical path where the outgoing light O is located, and plays a converging role on the outgoing light O. Specifically, the lens module 910 may include a single lens, or it may be a lens group composed of multiple lenses. Since the spot of the outgoing light O of the light source device 100 is small, the caliber and thickness of the lens in the lens module 910 can be reduced, thereby reducing the design difficulty and hardware cost of the lens module 910.

[0091] The prism module 920 is disposed between the lens module 910 and the light modulator 930, and is used to reflect the outgoing light O and focus it on the light modulator 930. The light modulator 930 is used to perform image modulation on the light and form light carrying image information. The prism module 920 is also used to transmit the light carrying image information to the projection area, such as a wall, a projection screen, and the like.

[0092] In some possible embodiments, the light modulator 930 may be a digital micromirror device (DMD), which is composed of a digital micromirror array, each digital micromirror constituting a modulation unit, and a modulation unit is used to modulate an image corresponding to a pixel. Each digital micromirror is flipped under the drive of a driving signal generated by a control device, and the number of flips of each digital micromirror is determined by the driving signal. The flipped digital micromirror modulates the light reflected by the prism module 920 and forms light carrying image information. In some other possible embodiments, the light modulator 930 may also be a HTPS LCD display chip, a reflective LCD device LCOS, etc. This embodiment does not limit the specific implementation of the light modulator 930.

[0093] This embodiment provides a light source device 100 and an optical imaging system 900 provided with the light source device 100. The light source device 100 may include a first laser light source 10, a second laser light source 20, a first wavelength light combining unit 30, a second wavelength light combining unit 40, and a polarization light combining module 50. The first laser light source 10 may include a first laser module 120 and a second laser module 140, the first laser module 120 is used to generate a first laser L1, the second laser module 140 is used to generate a second laser L2, and the first laser L1 and the second laser L2 are different colors.

[0094] The second laser light source 20 may include a third laser module 210 and a fourth laser module 230. The third laser module 210 is used to generate a third laser L3. The fourth laser module 230 is used to generate a fourth laser L4. The third laser L3 and the second laser L2 are different colors. The fourth laser L4 and the first laser L1 are different colors.

[0095] The first wavelength combining unit 30 is disposed on the optical path where the first laser L1 and the fourth laser L4 are located, and is used to combine the wavelengths of the first laser L1 and the fourth laser L4 to generate a first mixed light H1. The polarization state of the first mixed light H1 is a first polarization state. The second wavelength combining unit 40 is disposed on the optical path where the second laser L2 and the third laser L3 are located, and is used to combine the wavelengths of the second laser L2 and the third laser L3 to generate a second mixed light H2. The polarization state of the second mixed light H2 is a second polarization state, and the second polarization state is different from the first polarization state.

[0096] For example, when the first laser L1 is a blue-green mixed laser and the fourth laser L4 is a red laser, the first mixed light H1 is a red, green and blue three-color mixed laser, and the polarization state of the first mixed light H1 may be an S polarization state. When the second laser L2 is a red laser and the third laser L3 is a blue-green mixed laser, the second mixed light H2 is a red, green and blue three-color mixed laser, and the polarization state of the second mixed light H2 may be a P polarization state. Of course, in some other possible embodiments, the polarization state of the first mixed light H1 may be a P polarization state, and the polarization state of the second mixed light H2 may be an S polarization state.

[0097] The polarization light combining module 50 is disposed on the optical path of the first mixed light H1 and the second mixed light H2, and is used to perform polarization light combining on the first mixed light H1 and the second mixed light H2 to generate output light O. Since the polarization states of the two mixed lights are different, the two mixed lights can compensate each other in space, so that the light spot of the generated output light O is smaller.

[0098] Therefore, the light source device 100 in this embodiment combines multiple laser beams by combining wavelength light first and then polarization light, which can make the spot of the output light O generated finally smaller, and reduce the design difficulty and hardware cost of the components in the subsequent optical path. Furthermore, since the polarization states of the two mixed lights in this embodiment are different, the coherence of the laser beam can be weakened, thereby reducing the contrast of the speckle in the output light O, which is beneficial to improving the imaging quality of the optical imaging system provided with the light source device 100.

[0099] In the specification of this application, certain words are used to refer to specific components in the specification and claims. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as the criterion for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0100] In the description of the present application, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", and "inside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are merely simplified descriptions for the convenience of describing the present application. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0101] In this application, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be internal communication between two elements, or it can be only surface contact. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0102] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0103] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A light source device, characterized in that: include: A first laser light source includes a first laser module and a second laser module, wherein the first laser module is used to generate a first laser, and the second laser module is used to generate a second laser, and the first laser and the second laser are of different colors; A second laser light source includes a third laser module and a fourth laser module, wherein the third laser module is used to generate a third laser, and the fourth laser module is used to generate a fourth laser, wherein the third laser and the second laser are of different colors, and the fourth laser and the first laser are of different colors; a first wavelength combining unit, arranged on an optical path where the first laser and the fourth laser are located, for combining the wavelengths of the first laser and the fourth laser to generate a first mixed light; the polarization state of the first mixed light is a first polarization state; a second wavelength combining unit, arranged on an optical path where the second laser and the third laser are located, for combining the wavelengths of the second laser and the third laser to generate a second mixed light; the polarization state of the second mixed light is a second polarization state, and the second polarization state is different from the first polarization state; as well as The polarization light combining module is arranged on the optical path where the first mixed light and the second mixed light are located, and is used for performing polarization light combining on the first mixed light and the second mixed light to generate output light.

2. The light source device according to claim 1, characterized in that: The first laser and the third laser are of the same color, and the second laser and the fourth laser are of the same color; The emission directions of the first laser and the second laser are respectively perpendicular to the first plane; the emission directions of the third laser and the fourth laser are respectively perpendicular to the second plane, and the first plane and the second plane are perpendicular to each other.

3. The light source device according to claim 2, characterized in that: The first laser module and the second laser module are spaced apart in a first direction, the first direction is parallel to the first plane and the second plane respectively, and the third laser module and the fourth laser module are spaced apart in the first direction; The first laser and the fourth laser jointly define a first laser reference plane, the second laser and the third laser jointly define a second laser reference plane, and the first laser reference plane is parallel to the second laser reference plane.

4. The light source device according to claim 3, characterized in that: The first mixed light and the second mixed light are parallel; The polarization light combining module includes a reflection unit and a first polarization light combining unit. The reflection unit is arranged on the optical path where one of the first mixed light and the second mixed light is located, and is used to reflect the light incident to the reflection unit to generate reflected light; the first polarization light combining unit is arranged on the optical path where the other light of the first mixed light and the second mixed light and the reflected light are located, and is used to perform polarization light combining.

5. The light source device according to claim 4, characterized in that: The first polarization light combining unit is provided with a first polarization light combining plane, and the plane where the first polarization light combining plane is located is perpendicular to the first plane and intersects with the second plane; The polarization states of the first laser and the fourth laser relative to the first polarization combining plane are the first polarization state; the polarization states of the second laser and the third laser relative to the first polarization combining plane are the second polarization state.

6. The light source device according to any one of claims 3 to 5, characterized in that: The first laser module includes a first laser unit and a second laser unit, the first laser unit is used to generate a first sub-laser, the second laser unit is used to generate a second sub-laser, and the wavelengths of the second laser, the first sub-laser and the second sub-laser are different from each other; The third laser module includes a third laser unit and a fourth laser unit. The third laser unit is used to generate a third sub-laser. The fourth laser unit is used to generate a fourth sub-laser. The third sub-laser has the same color as the first sub-laser, and the fourth sub-laser has the same color as the second sub-laser.

7. The light source device according to claim 6, characterized in that: The first laser unit and the second laser unit are spaced apart in a second direction, and the second direction is parallel to the first plane and perpendicular to the first direction; The third laser unit and the fourth laser unit are arranged at intervals in a third direction, and the third direction is parallel to the second plane and perpendicular to the first direction.

8. The light source device according to claim 7, characterized in that: The first laser unit is located on a side of the second laser unit away from a first designated axis, the third laser unit is located on a side of the fourth laser unit away from the first designated axis, and the first designated axis is an intersection of the first plane and the second plane; or The second laser unit is located on a side of the first laser unit away from a first designated axis, and the fourth laser unit is located on a side of the third laser unit away from the first designated axis. The first designated axis is an intersection line of the first plane and the second plane.

9. The light source device according to claim 6, characterized in that: The first laser unit, the second laser unit and the second laser module are sequentially arranged at intervals in the first direction; The fourth laser module, the fourth laser unit and the third laser unit are sequentially arranged at intervals in the first direction.

10. The light source device according to any one of claims 3 to 5, characterized in that: The first wavelength combining unit includes a first body and a first wavelength combining layer, wherein the first wavelength combining layer is disposed on the first body and is used to perform wavelength combining on the first laser and the fourth laser; The second wavelength combining unit includes a second body and a second wavelength combining layer. The second wavelength combining layer is arranged on the second body and is used to perform wavelength combining on the second laser and the third laser. The second wavelength combining layer and the first wavelength combining layer have different transmissive and reflective properties.

11. The light source device according to claim 10, characterized in that: The first body and the second body are arranged coplanarly.

12. The light source device according to claim 2, characterized in that: The first laser module and the second laser module are spaced apart in a fourth direction, the fourth direction is parallel to the first plane and perpendicular to the second plane, the third laser module and the fourth laser module are spaced apart in a fifth direction, the fifth direction is parallel to the second plane and perpendicular to the first plane; The light source device further includes a polarization conversion unit, which is disposed on an optical path of two laser beams generated by any one of the first laser light source and the second laser light source, and is used to convert the polarization states of the two laser beams.

13. The light source device according to claim 12, characterized in that: The first mixed light and the second mixed light are perpendicular to each other; The polarization light combining module includes a second polarization light combining unit, which is arranged on the optical path of the first mixed light and the second mixed light and is used for performing polarization light combining.

14. The light source device according to claim 13, characterized in that: The second polarization light combining unit is provided with a second polarization light combining plane, and the plane where the second polarization light combining plane is located intersects with the first plane and the second plane respectively; The polarization states of the first laser and the third laser relative to the second polarization light combining plane are the second polarization state; the polarization states of the second laser and the fourth laser relative to the second polarization light combining plane are the first polarization state; The polarization conversion unit is disposed on an optical path where the first laser light and the second laser light are located.

15. The light source device according to any one of claims 14, characterized in that: The second laser module is located on a side of the first laser module away from a second designated axis, the fourth laser module is located on a side of the third laser module away from the second designated axis, and the second designated axis is an intersection of the first plane and the second plane; or The first laser module is located on a side of the second laser module away from a second designated axis, the third laser module is located on a side of the fourth laser module away from the second designated axis, and the second designated axis is an intersection line of the first plane and the second plane.

16. The light source device according to claim 14, characterized in that: The first laser module includes a first laser unit and a second laser unit, the first laser unit is used to generate a first sub-laser, the second laser unit is used to generate a second sub-laser, and the wavelengths of the second laser, the first sub-laser and the second sub-laser are different from each other; The third laser module includes a third laser unit and a fourth laser unit. The third laser unit is used to generate a third sub-laser. The fourth laser unit is used to generate a fourth sub-laser. The third sub-laser has the same color as the first sub-laser, and the fourth sub-laser has the same color as the second sub-laser.

17. The light source device according to claim 15, characterized in that: The first laser unit and the second laser unit are arranged at intervals in a sixth direction, the sixth direction is parallel to the first plane and perpendicular to the fourth direction; the third laser unit and the fourth laser unit are arranged at intervals in the sixth direction.

18. The light source device according to claim 15, characterized in that: The first laser unit, the second laser unit and the second laser module are sequentially arranged at intervals in the fourth direction; The third laser unit, the fourth laser unit, and the fourth laser module are sequentially arranged in intervals in the fifth direction.

19. An optical imaging system, characterized in that: include: The light source device according to any one of claims 1 to 18, wherein the light source device is used to generate output light; as well as The optical modulator is arranged on the optical path where the outgoing light is located.

Images