Polarization beam combiner and laser emitter

Abstract

A polarization beam combiner (120) and a laser emitter (100). By means of making the included angle between a beam combining layer (123), which is between a first prism (121) and a second prism (122), and a first light-incident face (1211) of the first prism (121) be smaller than 45°, the problem of when first laser (1111) vertically enters the first light-incident face (1211), return light formed by the first light-incident face (1211) reflecting the first laser (1111) returning back to a first laser chip (111) of a laser emission assembly (110), thus impacting the performance of the first laser chip (111), or even damaging the first laser chip (111), can be avoided, and / or the problem of when second laser (1121) vertically enters a second light-incident face (1221), return light formed by the second light-incident face (1221) reflecting the second laser (1121) returning back to a second laser chip (112) of the laser emission assembly (110), thus impacting the performance of the second laser chip (112), or even damaging the second laser chip (112), can be avoided.

Description

Polarization beam combiner and laser transmitter

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 4, 2024, with application number 202410017832.8. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of laser technology, and in particular to a polarization beam combiner and a laser transmitter. Background Art

[0003] Polarization beam combiners are important optical components of semiconductor lasers and have a significant impact on their performance. They are primarily used to combine the laser light emitted by the laser chip of a semiconductor laser into a combined beam and transmit it through optical fiber. SUMMARY OF THE INVENTION

[0004] As the power of semiconductor lasers continues to increase, the return light power generated by fiber laser modules that use semiconductor lasers as pump sources is also increasing during use, which can easily cause irreversible damage to the laser chip of the semiconductor laser, thereby affecting the reliability of the semiconductor laser.

[0005] The embodiments of the present application provide a polarization beam combiner and a laser transmitter, which aim to solve the problem that the laser chip of the laser transmitter is easily irreversibly damaged by reflected light, thereby affecting the reliability of the laser transmitter.

[0006] An embodiment of the present application provides a polarization beam combiner, comprising:

[0007] A first prism includes a first light incident surface, a light exit surface, and a first inclined surface sequentially distributed along a circumference of the first prism, wherein the first light incident surface is used to receive a first laser beam;

[0008] a second prism, comprising a second light incident surface and a second inclined surface sequentially distributed along a circumference of the second prism, wherein the second light incident surface is configured to receive a second laser beam, the second inclined surface is disposed opposite to the first inclined surface, and a beam combining layer is disposed between the first inclined surface and the second inclined surface, wherein the beam combining layer is configured to combine the first laser beam and the second laser beam to form a combined beam, which is then emitted from the light exiting surface;

[0009] In which, the light emitting surface and the second light incident surface are located on opposite sides of the polarization combiner, the first light incident surface is perpendicular to the second light incident surface, the angle formed by the combining layer and the first light incident surface is less than 45°, and at least one of the incident angle of the first laser and the incident angle of the second laser is greater than 0°.

[0010] In some embodiments, the first light incident surface is perpendicular to the light emitting surface.

[0011] In some embodiments, an incident angle of the first laser is greater than or equal to 0° and less than or equal to 10°.

[0012] In some embodiments, an incident angle of the second laser is greater than or equal to 0° and less than or equal to 10°.

[0013] In some embodiments, an incident angle of the first laser is equal to an incident angle of the second laser.

[0014] In some embodiments, the angle formed by the beam combining layer and the first light incident surface is greater than or equal to 30°.

[0015] In some embodiments, the emission angle of the combined light beam is greater than 0°.

[0016] The present application also provides a laser transmitter, comprising:

[0017] A laser emitting assembly, configured to emit a first laser and a second laser;

[0018] A polarization beam combiner, comprising a first prism and a second prism, wherein the first prism comprises a first light incident surface, a light exit surface, and a first inclined surface sequentially distributed along the circumference of the first prism, wherein the first light incident surface is used to receive a first laser beam; the second prism comprises a second light incident surface and a second inclined surface sequentially distributed along the circumference of the second prism, wherein the second light incident surface is used to receive a second laser beam, wherein the second inclined surface is arranged opposite to the first inclined surface, and a beam combining layer is provided between the first inclined surface and the second inclined surface, wherein the beam combining layer is used to combine the first laser beam and the second laser beam to form a combined beam, which is then emitted from the light exit surface;

[0019] In which, the light emitting surface and the second light incident surface are located on opposite sides of the polarization combiner, the first light incident surface is perpendicular to the second light incident surface, the angle formed by the combining layer and the first light incident surface is less than 45°, and at least one of the incident angle of the first laser and the incident angle of the second laser is greater than 0°.

[0020] In some embodiments, the first light incident surface is perpendicular to the light emitting surface.

[0021] In some embodiments, an incident angle of the first laser is greater than or equal to 0° and less than or equal to 10°.

[0022] In some embodiments, an incident angle of the second laser is greater than or equal to 0° and less than or equal to 10°.

[0023] In some embodiments, an incident angle of the first laser is equal to an incident angle of the second laser.

[0024] In some embodiments, the angle formed by the beam combining layer and the first light incident surface is greater than or equal to 30°.

[0025] In some embodiments, the emission angle of the combined light beam is greater than 0°.

[0026] In some embodiments, the light emitting surface is provided with a reflective film; and the first light incident surface is provided with a half-wave plate.

[0027] In some embodiments, the laser emitter further includes a light-absorbing structure, which is arranged relative to at least one of the first light incident surface, the second light incident surface, and the light-emitting surface of the polarization combiner to absorb the returned light reflected from at least one side of the light-emitting surface, the first light incident surface, or the second light incident surface. Beneficial effects

[0028] The polarization beam combiner provided in the embodiment of the present application is configured such that the angle formed between the beam combining layer between the first prism and the second prism and the first light incident surface of the first prism is less than 45°. Thus, the incident angle of the first laser and / or the incident angle of the second laser can be adjusted so that at least one of the incident angles of the first laser and the second laser is greater than 0°, that is, at least one of the first laser and the second laser is not perpendicular to the corresponding light incident surface, so as to avoid the first laser perpendicularly entering the first light incident surface, whereby the reflected light formed by the first laser is reflected by the first light incident surface and returns to the first laser chip of the laser emitting assembly, thereby affecting the performance of the first laser chip or even damaging the first laser chip, and / or avoid the second laser perpendicularly entering the second light incident surface, whereby the reflected light formed by the second laser is reflected by the second light incident surface and returns to the second laser chip of the laser emitting assembly, thereby affecting the performance of the second laser chip or even damaging the second laser chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0030] FIG1 is a schematic structural diagram of an embodiment of a laser transmitter provided in an embodiment of the present application;

[0031] FIG2 is a schematic structural diagram of an embodiment of a polarization beam combiner provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] Laser emitter 100; laser emitting assembly 110; first laser chip 111; first laser 1111; second laser chip 112; second laser 1121; polarization beam combiner 120; first prism 121; first light incident surface 1211; light emitting surface 1212; first inclined surface 1213; second prism 122; second light incident surface 1221; second inclined surface 1222; beam combining layer 123; combined light 1231; reflective film 124; half-wave plate 125. Modes for Carrying Out the Invention

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not 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 efforts are within the scope of protection of this application.

[0035] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0036] The embodiments of the present application provide a polarization beam combiner and a laser transmitter, which are described in detail below.

[0037] First, an embodiment of the present application provides a polarization beam combiner.

[0038] FIG1 is a schematic diagram of the structure of an embodiment of a laser transmitter provided in an embodiment of the present application. FIG2 is a schematic diagram of the structure of an embodiment of a polarization beam combiner provided in an embodiment of the present application. As shown in FIG1 and FIG2, the laser transmitter 100 includes a laser transmitting assembly 110 and a polarization beam combiner 120, which is used to transmit a first laser 1111 and a second laser 1121. The polarization beam combiner 120 is used to receive the first laser 1111 and the second laser 1121, and combine the first laser 1111 and the second laser 1121 to form a combined beam 1231, which is then emitted.

[0039] Among them, the polarization beam combiner 120 includes a first light incident surface 1211, a second light incident surface 1221, a beam combining layer 123 and a light output surface 1212. The first light incident surface 1211 is used to receive the first laser 1111, so that the first laser 1111 is transmitted to the beam combining layer 123. The second light incident surface 1221 is used to receive the second laser 1121, so that the second laser 1121 is transmitted to the beam combining layer 123. The beam combining layer 123 is used to combine the first laser 1111 and the second laser 1121 to form a combined beam 1231 and then transmit it to the light output surface 1212, and emit it from the light output surface 1212.

[0040] Specifically, the laser emitting assembly 110 includes multiple first laser chips 111 and multiple second laser chips 112 . The laser beams emitted by the multiple first laser chips 111 are combined to form a first laser beam 1111 , and the laser beams emitted by the multiple second laser chips 112 are combined to form a second laser beam 1121 .

[0041] As shown in FIG2 , the polarization beam combiner 120 may include a first prism 121 and a second prism 122. The first prism 121 includes a first light incident surface 1211, a light exit surface 1212, and a first inclined surface 1213, which are sequentially distributed along the circumference of the first prism 121. The second prism 122 includes a second light incident surface 1221 and a second inclined surface 1222, which are sequentially distributed along the circumference of the second prism 122. The second inclined surface 1222 of the second prism 122 is disposed opposite to the first inclined surface 1213 of the first prism 121, and a beam combining layer 123 is provided between the first inclined surface 1213 and the second inclined surface 1222. The beam combining layer 123 is configured to combine the first laser beam 1111 and the second laser beam 1121 to form a combined beam 1231, which is then emitted from the light exit surface 1212. The light-emitting surface 1212 of the first prism 121 and the second light-incident surface 1221 of the second prism 122 are located on opposite sides of the polarization beam combiner 120 , and the first light-incident surface 1211 of the first prism 121 and the second light-incident surface 1221 of the second prism 122 are perpendicular to each other.

[0042] In some embodiments, the angle α formed by the beam combining layer 123 between the first prism 121 and the second prism 122 of the polarization beam combiner 120 and the first light incident surface 1211 of the first prism 121 may be smaller than 45°. Thus, the incident angle β of the first laser 1111 and / or the incident angle θ of the second laser 1121 can be adjusted so that at least one of the incident angle β of the first laser 1111 and the incident angle θ of the second laser 1121 is greater than 0°. That is, at least one of the first laser 1111 and the second laser 1121 is not perpendicular to the corresponding light incident surface. This prevents the first laser 1111 from perpendicularly entering the first light incident surface 1211, whereby the reflected light generated by the first light incident surface 1211 is not returned to the first laser chip 111 of the laser emitting assembly 110, thereby affecting the performance of the first laser chip 111 or even damaging the first laser chip 111. This also prevents the second laser 1121 from perpendicularly entering the second light incident surface 1221, whereby the reflected light generated by the second laser 1121 is not returned to the second laser chip 112 of the laser emitting assembly 110, thereby affecting the performance of the second laser chip 112 or even damaging the second laser chip 112. The angle α formed by the beam combining layer 123 between the first prism 121 and the second prism 122 of the polarization beam combiner 120 and the first light incident surface 1211 of the first prism 121 can be 42°, 40°, 38°, 35°, etc.

[0043] It should be noted that the incident angle β of the first laser 1111 is the angle β formed by the first laser 1111 emitted toward the first light incident surface 1211 and the normal to the first light incident surface 1211. When the first laser 1111 is perpendicular to the first light incident surface 1211, the incident angle β of the first laser 1111 is 0°. The incident angle θ of the second laser 1121 is the angle θ formed by the second laser 1121 emitted toward the second light incident surface 1221 and the normal to the second light incident surface 1221. When the second laser 1121 is perpendicular to the second light incident surface 1221, the incident angle θ of the second laser 1121 is 0°. In addition, the incident angle β of the first laser 1111 and the incident angle θ of the second laser 1121 can both be greater than 0°, or only the incident angle β of the first laser 1111 can be greater than 0°, or only the incident angle θ of the second laser 1121 can be greater than 0°.

[0044] At the same time, by making at least one of the incident angle β of the first laser 1111 and the incident angle θ of the second laser 1121 greater than 0°, the included angle α between the return light reflected by the first light incident surface 1211 and the first laser 1111 incident on the first light incident surface 1211 can be greater than 0°, so that the first light incident surface 1211 reflects the return light to another position, thereby preventing the return light from being transmitted back along the optical path of the first laser 1111 into the first laser chip 111; and / or, by making the included angle α between the return light reflected by the second light incident surface 1221 and the second laser 1121 incident on the second light incident surface 1221 greater than 0°, thereby causing the second light incident surface 1221 to reflect the return light to another position, thereby preventing the return light from being transmitted back along the optical path of the second laser 1121 into the second laser chip 112.

[0045] In addition, the incident angle β of the first laser 1111 and / or the incident angle θ of the second laser 1121 can be adjusted so that the exit angle γ of the combined light 1231 formed by combining the first laser 1111 and the second laser 1121 by the beam combining layer 123 is greater than 0°, thereby preventing the return light from returning from the light exit surface 1212 and entering the polarization beam combiner 120. At the same time, the angle between the return light reflected from the light exit surface 1212 and the combined light 1231 emitted from the light exit surface 1212 is greater than 0°, thereby reflecting the return light to another location and preventing the return light reflected from the light exit surface 1212 from re-entering the optical path of the laser emitter 100. The exit angle γ of the combined light 1231 is the angle α formed by the combined light 1231 emitted from the light exit surface 1212 and the normal to the light exit surface 1212. When the combined light beam 1231 is perpendicular to the light emitting surface 1212 , the emission angle γ of the combined light beam 1231 is 0°.

[0046] Among them, the angle α formed by the combining layer 123 between the first prism 121 and the second prism 122 of the polarization combiner 120 and the first light incident surface 1211 of the first prism 121 can be greater than or equal to 30°, so that the combining layer 123 can combine the first laser 1111 and the second laser 1121 to form a combined beam 1231, which can be emitted from the light output surface 1212.

[0047] In some embodiments, the incident angle β of the first laser 1111 can be set to be greater than or equal to 0° and less than or equal to 10° to effectively prevent the first light incident surface 1211 from reflecting the return light back to the first laser chip 111 while allowing the first laser 1111 to be transmitted from the first light incident surface 1211 to the beam combining layer 123. The incident angle β of the first laser 1111 can be 2°, 5°, 8°, 9°, etc. In some preferred embodiments, the incident angle β of the first laser 1111 can be set to be greater than or equal to 5° to further prevent the first light incident surface 1211 from reflecting the return light back to the first laser chip 111.

[0048] Similarly, the incident angle θ of the second laser beam 1121 can be set to be greater than or equal to 0° and less than or equal to 10° to effectively prevent the second light incident surface 1221 from reflecting the return light toward the second laser chip 112 while allowing the second laser beam 1121 to be transmitted from the second light incident surface 1221 to the beam combining layer 123. The incident angle θ of the second laser beam 1121 can be 2°, 5°, 8°, 9°, etc. In some preferred embodiments, the incident angle θ of the second laser beam 1121 can be set to be greater than or equal to 5° to further prevent the second light incident surface 1221 from reflecting the return light toward the second laser chip 112.

[0049] In the embodiment of the present application, the incident angle β of the first laser 1111 can be equal to the incident angle θ of the second laser 1121, or the incident angle β of the first laser 1111 can be unequal to the incident angle θ of the second laser 1121, which can be determined specifically according to the structure and material of the polarization combiner 120.

[0050] Specifically, the first light incident surface 1211 of the first prism 121 can be perpendicular to the light emitting surface 1212. The incident angle β of the first laser beam 1111 is 8°. The incident angle θ of the second laser beam 1121 is 8°. The angle α formed by the beam combining layer 123 between the first prism 121 and the second prism 122 of the polarization beam combiner 120 and the first light incident surface 1211 of the first prism 121 can be 39.74°.

[0051] In some embodiments, as shown in FIG2 , a reflective film 124 can be provided on the light-exiting surface 1212 of the polarization beam combiner 120. Thus, the reflective film 124 can reflect the return light that is emitted toward the light-exiting surface 1212 in the direction of the combined light 1231, thereby preventing the return light from entering the polarization beam combiner 120 and affecting the performance of the polarization beam combiner 120 or even the performance of the laser transmitter 100. The reflective film 124 can be used to reflect return light having a wavelength of 1064 nm or other wavelengths, depending on the wavelength of the return light.

[0052] Of course, a reflective film 124 may be provided on the first light incident surface 1211 of the first prism 121 to reflect the light reflected from the first prism 121 toward the first light incident surface 1211. Alternatively, a reflective film 124 may be provided on the second light incident surface 1221 of the second prism 122 to reflect the light reflected from the second prism 122 toward the second light incident surface 1221.

[0053] In some embodiments, a half-wave plate 125 can be provided on the first light incident surface 1211 of the first prism 121. The half-wave plate 125 can perform half-wave processing on the first laser beam 1111 incident on the first light incident surface 1211. Specifically, the first laser beam 1111 and the second laser beam 1121 can both be P-polarized light. When the first laser beam 1111 incident on the first light incident surface 1211 passes through the half-wave plate 125, it is converted into S-polarized light by the half-wave plate 125.

[0054] An embodiment of the present application also provides a laser emitter, which includes a polarization beam combiner. The specific structure of the polarization beam combiner refers to the above embodiment. Since this laser emitter adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0055] The laser transmitter 100 may include a laser transmitting assembly 110 and a polarization beam combiner 120. The laser transmitting assembly 110 is configured to transmit a first laser beam 1111 and a second laser beam 1121. A first light incident surface 1211 of the polarization beam combiner 120 is located on the optical path of the first laser beam 1111, and a second light incident surface 1221 of the polarization beam combiner 120 is located on the optical path of the second laser beam 1121. At least one of an incident angle β of the first laser beam 1111 and an incident angle θ of the second laser beam 1121 is greater than 0°.

[0056] The laser emitter 100 provided in the embodiment of the present application makes the angle formed by the beam combining layer between the first prism and the second prism of the polarization beam combiner and the first light incident surface of the first prism less than 45°, and makes at least one of the incident angles of the first laser and the second laser greater than 0°, that is, makes at least one of the first laser and the second laser non-perpendicular to the corresponding light incident surface, so as to avoid that when the first laser enters the first light incident surface vertically, the return light formed by the first laser reflected by the first light incident surface returns to the first laser chip of the laser emitting component, thereby affecting the performance of the first laser chip and even damaging the first laser chip, and / or avoid that when the second laser enters the second light incident surface vertically, the return light formed by the second laser reflected by the second light incident surface returns to the second laser chip of the laser emitting component, thereby affecting the performance of the second laser chip and even damaging the second laser chip.

[0057] In some embodiments, the laser emitter 100 may further include a light-absorbing structure (not shown in the figure), which is arranged relative to at least one of the first light-incident surface 1211, the second light-incident surface 1221 and the light-emitting surface 1212 of the polarization combiner 120 to absorb the returned light reflected from at least one side of the light-emitting surface 1212, the first light-incident surface 1211 or the second light-incident surface 1221, thereby preventing the returned light from damaging other components of the laser emitter 100.

[0058] Specifically, the light absorbing structure can be arranged opposite to the first light incident surface 1211 of the first prism 121, so that the light absorbing structure absorbs the returned light reflected by the first light incident surface 1211 of the first prism 121; and / or, the light absorbing structure can be arranged opposite to the light emitting surface 1212 of the first prism 121, so that the light absorbing structure absorbs the returned light reflected by the light emitting surface 1212 of the first prism 121; and / or, the light absorbing structure can be arranged opposite to the second light incident surface 1221 of the second prism 122, so that the light absorbing structure absorbs the returned light reflected by the second light incident surface 1221.

[0059] The laser transmitter 100 may include a mounting base (not shown) including an optical cavity, wherein the laser transmitting assembly 110 and the polarization beam combiner 120 are disposed within the optical cavity of the mounting base. A light-absorbing structure is disposed within the optical cavity of the mounting base and is spaced relative to at least one of the first light-incident surface 1211, the second light-incident surface 1221, and the light-exiting surface 1212 of the polarization beam combiner 120, so that the light-absorbing structure can absorb light reflected from at least one of the first light-incident surface 1211, the second light-incident surface 1221, and the light-exiting surface 1212 of the polarization beam combiner 120.

[0060] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0061] The above is a detailed introduction to a polarization beam combiner and laser transmitter provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0062] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot 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 one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0063] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0064] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

Claims

1. A polarization beam combiner, wherein, The polarization beam combiner includes: A first prism, including a first light incident surface, a light output surface, and a first inclined surface that are sequentially distributed along the circumferential direction of the first prism. The first light incident surface is used to receive the first laser. A second prism, including a second light incident surface and a second inclined surface that are sequentially distributed along the circumferential direction of the second prism. The second light incident surface is used to receive the second laser. The second inclined surface is disposed opposite to the first inclined surface, and a beam combining layer is provided between the first inclined surface and the second inclined surface. The beam combining layer is used to combine the first laser and the second laser to form a combined beam of light and emit it from the light output surface. Wherein, the light output surface and the second light incident surface are located on opposite sides of the polarization beam combiner. The first light incident surface is perpendicular to the second light incident surface. The included angle formed by the beam combining layer and the first light incident surface is less than 45°. At least one of the incident angles of the first laser and the second laser is greater than 0°.

2. The polarization beam combiner according to claim 1, wherein, The first light incident surface is perpendicular to the light output surface.

3. The polarization beam combiner according to claim 1, wherein, The incident angle of the first laser is greater than or equal to 0° and less than or equal to 10°.

4. The polarization beam combiner according to claim 1, wherein, The incident angle of the second laser is greater than or equal to 0° and less than or equal to 10°.

5. The polarization beam combiner according to claim 1, wherein, The incident angle of the first laser is equal to the incident angle of the second laser.

6. The polarization beam combiner according to claim 1, wherein, The included angle formed by the beam combining layer and the first light incident surface is greater than or equal to 30°.

7. The polarization beam combiner according to claim 1, wherein, The emission angle of the combined beam of light is greater than 0°.

8. The polarization beam combiner according to any one of claims 1 to 7, wherein, A reflective film is provided on the light output surface; a half-wave plate is provided on the first light incident surface.

9. A laser emitter, wherein, The laser emitter includes: A laser emission component for emitting the first laser and the second laser. A polarization beam combiner, including a first prism and a second prism. The first prism includes a first light incident surface, a light output surface, and a first inclined surface that are sequentially distributed along the circumferential direction of the first prism. The first light incident surface is used to receive the first laser. The second prism includes a second light incident surface and a second inclined surface that are sequentially distributed along the circumferential direction of the second prism. The second light incident surface is used to receive the second laser. The second inclined surface is disposed opposite to the first inclined surface, and a beam combining layer is provided between the first inclined surface and the second inclined surface. The beam combining layer is used to combine the first laser and the second laser to form a combined beam of light and emit it from the light output surface. Wherein, the light output surface and the second light incident surface are located on opposite sides of the polarization beam combiner. The first light incident surface is perpendicular to the second light incident surface. The included angle formed by the beam combining layer and the first light incident surface is less than 45°. At least one of the incident angles of the first laser and the second laser is greater than 0°.

10. The laser emitter according to claim 9, wherein, The first light incident surface is perpendicular to the light output surface.

11. The laser emitter according to claim 9, wherein, The incident angle of the first laser is greater than or equal to 0° and less than or equal to 10°.

12. The laser emitter according to claim 9, wherein, The incident angle of the second laser is greater than or equal to 0° and less than or equal to 10°.

13. The laser emitter according to claim 9, wherein, The incident angle of the first laser is equal to the incident angle of the second laser.

14. The laser emitter according to claim 9, wherein, The included angle formed by the beam combining layer and the first light incident surface is greater than or equal to 30°.

15. The laser emitter according to claim 9, wherein, The emission angle of the combined beam of light is greater than 0°.

16. The laser emitter according to claim 9, wherein, A reflective film is provided on the light output surface; a half-wave plate is provided on the first light incident surface.

17. The laser emitter according to claim 9, wherein, The laser emitter further includes a light-absorbing structure, which is disposed opposite to at least one of the first light-incident surface, the second light-incident surface, and the light-emitting surface of the polarization beam combiner, so as to absorb the return light reflected from at least one side of the light-emitting surface, the first light-incident surface, or the second light-incident surface.

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