Polarization beam splitting prism assembly and laser pumping source

Abstract

A polarization beam splitting prism assembly (140) and a laser pumping source (100). A second light-emitting surface (1422) of a polarizer (142) and a first light-emitting surface (1412) of a half-wave plate (141) are provided opposite to each other, and an included angle between the first light-emitting surface (1412) and the second light-emitting surface (1422) is an acute angle. In addition, the second light-emitting surface (1422) of the polarizer (142) is provided with a polarizing film (144) used for transmitting light emitted from the second light-emitting surface (1422) and reflecting light emitted from the first light-emitting surface (1412), so that incident light of a first light incident surface (1411) and a second light incident surface (1421) is combined, and heat absorption is reduced, thereby ameliorating the temperature rise of the polarization beam splitting prism assembly (140).

Description

Polarization beam splitter prism assembly and laser pump source

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 25, 2023, with application number 202311797566.7. 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 splitter prism assembly and a laser pump source. Background Art

[0003] The optical path design within the laser pump source is to shape the light coming out of the chip through the fast axis and slow axis, then combine the fast and slow axis lights through a polarization beam splitter prism assembly, and finally couple the combined light into the optical fiber. Technical issues

[0004] In recent years, with the rapid development of high-power fiber lasers and semiconductor fiber lasers, the power of laser pump source chips has become higher and higher, and the overall light output power of the laser pump source will also increase accordingly. The temperature of the optical components in the laser pump source will also increase accordingly, especially the polarization beam splitter prism component used to combine light beams, which is very prone to the risk of damage due to overheating. Technical Solutions

[0005] The embodiments of the present application provide a polarization beam splitter prism assembly and a laser pump source, which aim to solve the problem that the polarization beam splitter prism assembly is easily damaged due to overheating.

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

[0007] A half-wave plate comprising a first light incident surface and a first light emitting surface opposite to each other;

[0008] A polarizer includes a second light incident surface and a second light exiting surface relative to each other, wherein the second light exiting surface is arranged opposite to the first light exiting surface, and the angle between the first light exiting surface and the second light exiting surface is an acute angle, and the second light exiting surface is provided with a polarizing film, which is used to transmit light emitted from the second light exiting surface and reflect light emitted from the first light exiting surface.

[0009] In some embodiments, the first light incident surface and the second light incident surface are respectively used for allowing P light to be incident, and the polarizing film is used for transmitting P light and returning S light.

[0010] In some embodiments, the first light incident surface and the second light incident surface are respectively used for allowing S light to enter, and the polarizing film is used for transmitting S light and returning P light.

[0011] In some embodiments, an included angle between the first light emitting surface and the second light emitting surface is greater than or equal to 43° and less than or equal to 47°.

[0012] In some embodiments, one side of the half-wave plate and one side of the polarizer are close to and parallel to each other.

[0013] In some embodiments, the second light incident surface of the polarizer is provided with an anti-reflection film.

[0014] In some embodiments, the polarization beam splitter prism assembly further includes a base, and the half-wave plate and the polarizer are respectively mounted on the base.

[0015] The embodiment of the present application further provides a laser pump source, wherein the laser pump source includes:

[0016] a housing, the housing comprising an optical cavity;

[0017] A first laser assembly is disposed in the optical cavity, and the first laser assembly is used to emit a first laser;

[0018] a second laser assembly, disposed in the optical cavity, and configured to emit a second laser;

[0019] A polarizing beam splitter prism assembly is disposed in the optical cavity, the polarizing beam splitter prism assembly comprising a half-wave plate and a polarizer, the half-wave plate comprising a first light incident surface and a first light exit surface relative to each other; the polarizer comprising a second light incident surface and a second light exit surface relative to each other, the second light exit surface being arranged opposite to the first light exit surface, and the angle between the first light exit surface and the second light exit surface being an acute angle, the second light exit surface being provided with a polarizing film, the polarizing film being used to transmit light emitted from the second light exit surface and reflect light emitted from the first light exit surface.

[0020] In some embodiments, the first light incident surface and the second light incident surface are respectively used for allowing P light to be incident, and the polarizing film is used for transmitting P light and returning S light.

[0021] In some embodiments, the first light incident surface and the second light incident surface are respectively used for allowing S light to be incident, and the polarizing film is used for transmitting S light and returning P light.

[0022] In some embodiments, an included angle between the first light emitting surface and the second light emitting surface is greater than or equal to 43° and less than or equal to 47°.

[0023] In some embodiments, one side of the half-wave plate and one side of the polarizer are close to and parallel to each other.

[0024] In some embodiments, the second light incident surface of the polarizer is provided with an anti-reflection film.

[0025] In some embodiments, the laser pump source further includes a base, and the half-wave plate and the polarizer are respectively mounted on the base.

[0026] In some embodiments, the first laser and the second laser are both P light.

[0027] In some embodiments, the laser pump source further includes a reflector and a beam expander assembly disposed in the optical cavity, wherein the reflector is located in the optical path of the first laser and is used to reflect the first laser to the first light incident surface; the beam expander assembly is located in the optical path of the second light emitting surface of the polarizer, and the beam expander assembly is used to expand the light emitted from the second light emitting surface. Beneficial effects

[0028] The polarization beam splitter prism assembly provided in the embodiment of the present application is configured such that the second light-emitting surface of the polarizer is arranged opposite to the first light-emitting surface of the half-wave plate, and the angle between the first light-emitting surface and the second light-emitting surface is an acute angle. At the same time, a polarizing film is provided on the second light-emitting surface of the polarizer for transmitting light emitted from the second light-emitting surface and reflecting light emitted from the first light-emitting surface. In this way, a first laser can enter the half-wave plate from the first light-emitting surface of the half-wave plate, be rotated by the half-wave plate, and then be emitted from the first light-emitting surface of the half-wave plate to the polarizing film on the second light-emitting surface of the polarizer, and be reflected by the polarizing film. At the same time, a second laser can enter the polarizer from the second light-entry surface of the polarizer, be emitted from the second light-emitting surface of the polarizer, and be combined with the first laser after passing through the polarizing film to form a combined beam.

[0029] Because the polarization beam splitter prism assembly utilizes a separate half-wave plate and polarizer, while achieving beam combining of the first and second laser beams, it eliminates redundant material components compared to existing cube-shaped polarization beam splitter prism assemblies, thereby reducing heat absorption caused by the polarization beam splitter prism assembly's own materials. This effectively improves the temperature rise of the polarization beam splitter prism assembly in high-power laser pump sources and avoids damage to the polarization beam splitter prism assembly due to excessive temperature. Furthermore, due to the low cost of the half-wave plate and polarizer, the polarization beam splitter prism assembly provided in the embodiments of the present application is relatively low in cost.

[0030] In addition, since the polarization beam splitter prism assembly adopts a separate arrangement of a half-wave plate and a polarizer, the relative positions of the half-wave plate and the polarizer can be adjusted according to the structure of the laser pump source to adjust the angle between the first light-emitting surface of the half-wave plate and the second light-emitting surface of the polarizer, so that the polarization beam splitter prism assembly is more compatible with other optical components in the laser pump source. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] FIG1 is a schematic structural diagram of an embodiment of a laser pump source provided in an embodiment of the present application;

[0033] FIG2 is a schematic structural diagram of an embodiment of a polarization beam splitting prism assembly provided in an embodiment of the present application;

[0034] FIG3 is a view from another angle of an embodiment of the polarization beam splitting prism assembly provided in an embodiment of the present application.

[0035] Laser pump source 100; housing 110; optical cavity 1101; first laser assembly 120; first laser chip 121; second laser assembly 130; second laser chip 131; polarization beam splitter assembly 140; half-wave plate 141; first light incident surface 1411; first light exit surface 1412; first side 1413; polarizer 142; second light incident surface 1421; second light exit surface 1422; second side 1423; anti-reflection film 143; polarizing film 144; reflector 150; beam expander assembly 160; collimating lens assembly 170; first laser 180; second laser 190. DETAILED DESCRIPTION

[0036] 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.

[0037] The present invention provides a polarization beam splitter prism assembly and a laser pump source, which are described in detail below.

[0038] FIG1 is a schematic diagram of the structure of an embodiment of a laser pump source provided in an embodiment of the present application. As shown in FIG1 , the laser pump source 100 includes a housing 110, a first laser assembly 120, a second laser assembly 130, and a polarization beam splitter prism assembly 140. The housing 110 includes an optical cavity 1101. The first laser assembly 120 and the second laser assembly 130 are disposed within the optical cavity 1101. The first laser assembly 120 is configured to emit a first laser beam 180, and the second laser assembly 130 is configured to emit a second laser beam 190. The polarization beam splitter prism assembly 140 is disposed within the optical cavity 1101 and is configured to receive the first laser beam 180 and the second laser beam 190, and to combine the first laser beam 180 and the second laser beam 190 to form a combined beam for output.

[0039] When the power of the first laser assembly 120 and the second laser assembly 130 is increased to increase the total power of the laser pump source 100, the energy of the first laser 180 and the second laser 190 will also increase accordingly. The energy of the laser light passing through the polarization beam splitter prism assembly 140 will also continue to increase, resulting in the risk of overheating of the polarization beam splitter prism assembly 140.

[0040] In the prior art, to enable the polarization beam splitter prism assembly 140 to be used in a high-power laser pump source 100, improvements are generally made through two methods: optimizing the coating process and replacing the material. Optimizing the coating process primarily involves optimizing the coating layer on the surface of the polarization beam splitter prism assembly 140 to improve the temperature rise of the polarization beam splitter prism assembly 140. However, while optimizing the coating layer prioritizes improving the temperature rise of the polarization beam splitter prism assembly 140, there is still a risk of the polarization beam splitter prism assembly 140 overheating. Replacing the material primarily involves improving the material of the polarization beam splitter prism assembly 140. For example, replacing the polarization beam splitter prism assembly 140 from K9 material to fused quartz material can improve the temperature rise of the polarization beam splitter prism assembly 140 to a certain extent. However, fused quartz is expensive, and the material cost is too high.

[0041] In view of this, an embodiment of the present application provides a polarization beam splitter prism assembly, which effectively improves the temperature rise of the polarization beam splitter prism assembly while avoiding excessively high costs of the polarization beam splitter prism assembly.

[0042] FIG2 is a schematic structural diagram of an embodiment of a polarization beam splitter prism assembly provided in an embodiment of the present application. FIG3 is a view from another angle of an embodiment of a polarization beam splitter prism assembly provided in an embodiment of the present application. As shown in FIG2 and FIG3, the polarization beam splitter prism assembly 140 includes a half-wave plate 141 and a polarizer 142, wherein the half-wave plate 141 includes a first light incident surface 1411 and a first light exit surface 1412 relative to each other. The half-wave plate 141 is used to rotate polarized light. When P light enters the half-wave plate 141 from the first light incident surface 1411 of the half-wave plate 141, it is converted by the half-wave plate 141 into S light and emitted from the first light exit surface 1412 of the half-wave plate 141. When S light enters the half-wave plate 141 from the first light incident surface 1411 of the half-wave plate 141, it is converted by the half-wave plate 141 into P light and emitted from the first light exit surface 1412 of the half-wave plate 141.

[0043] The polarizer 142 includes a second light incident surface 1421 and a second light emitting surface 1422 relative to each other. The second light emitting surface 1422 is arranged opposite to the first light emitting surface 1412, and the angle between the first light emitting surface 1412 and the second light emitting surface 1422 is an acute angle. The second light emitting surface 1422 is provided with a polarizing film 144, which is used to transmit light emitted from the second light emitting surface 1422 and reflect light emitted from the first light emitting surface 1412.

[0044] Thus, the first laser 180 can enter the half-wave plate 141 from the first light incident surface 1411 of the half-wave plate 141, and after being rotated by the half-wave plate 141, be emitted from the first light emitting surface 1412 of the half-wave plate 141 to the polarizing film 144 of the second light emitting surface 1422 of the polarizing plate 142, and be reflected by the polarizing film 144. At the same time, the second laser 190 can enter the polarizing plate 142 from the second light incident surface 1421 of the polarizing plate 142, and then be emitted from the second light emitting surface 1422 of the polarizing plate 142, and after passing through the polarizing film 144, be combined with the first laser 180 to form a combined beam.

[0045] Because the polarization beam splitter prism assembly 140 is configured using a half-wave plate 141 and a polarizer 142 as separate components, while achieving beam combining of the first laser beam 180 and the second laser beam 190, it eliminates redundant material components compared to existing cube-shaped polarization beam splitter prism assemblies 140, thereby reducing heat absorption caused by the polarization beam splitter prism assembly 140's own materials. This effectively improves the temperature rise of the polarization beam splitter prism assembly 140 in the high-power laser pump source 100 and avoids damage to the polarization beam splitter prism assembly 140 due to excessive temperature. Furthermore, because the half-wave plate 141 and the polarizer 142 are relatively low in cost, the polarization beam splitter prism assembly 140 provided in the embodiments of the present application is relatively low in cost.

[0046] In addition, since the polarization beam splitter prism assembly 140 uses a half-wave plate 141 and a polarizer 142 that are separately arranged, the relative positions of the half-wave plate 141 and the polarizer 142 can be adjusted according to the structure of the laser pump source 100 to adjust the angle α between the first light-emitting surface 1412 of the half-wave plate 141 and the second light-emitting surface 1422 of the polarizer 142, so that the polarization beam splitter prism assembly 140 is more compatible with other optical components in the laser pump source 100.

[0047] In the embodiment of the present application, the type of polarizing film 144 disposed on the second light-emitting surface 1422 of the polarizer 142 can be determined based on the types of the first laser light 180 emitted by the first laser assembly 120 and the second laser light 190 emitted by the second laser assembly 130 of the laser pump source 100. For example, when the first laser light 180 emitted by the first laser assembly 120 and the second laser light 190 emitted by the second laser assembly 130 are both P light, the polarizing film 144 disposed on the second light-emitting surface 1422 of the polarizer 142 can be configured to transmit P light and return S light; when the first laser light 180 emitted by the first laser assembly 120 and the second laser light 190 emitted by the second laser assembly 130 are both S light, the polarizing film 144 disposed on the second light-emitting surface 1422 of the polarizer 142 can be configured to transmit S light and return P light.

[0048] In some embodiments, the first light incident surface 1411 of the half-wave plate 141 and the second light incident surface 1421 of the polarizer 142 are respectively used to allow P light to enter, and the polarizer 144 is used to transmit P light and return S light. That is, the first laser 180 and the second laser 190 are both P light. The first laser 180 passes through the half-wave plate 141, is converted into S light by the half-wave plate 141, and then is emitted to the polarizer 144. It is reflected by the surface of the polarizer 144 facing away from the polarizer 142. The second laser 190 passes through the polarizer 142 and the polarizer 144, and is emitted from the surface of the polarizer 144 facing away from the polarizer 142, thereby achieving the combination of the P light and the S light on the surface of the polarizer 144 facing away from the polarizer 142.

[0049] In other embodiments, the first light incident surface 1411 of the half-wave plate 141 and the second light incident surface 1421 of the polarizer 142 are respectively used to allow S light to enter, and the polarizer 144 is used to transmit the S light and return the P light. That is, the first laser 180 and the second laser 190 are both S light. The first laser 180 passes through the half-wave plate 141, is converted into P light by the half-wave plate 141, and then is emitted to the polarizer 144. It is reflected by the surface of the polarizer 144 facing away from the polarizer 142. The second laser 190 passes through the polarizer 142 and the polarizer 144, and is emitted from the surface of the polarizer 144 facing away from the polarizer 142, thereby achieving the combination of the P light and the S light on the surface of the polarizer 144 facing away from the polarizer 142.

[0050] In some embodiments, the included angle α between the first light emitting surface 1412 of the half-wave plate 141 and the second light emitting surface 1422 of the polarizer 142 can be greater than or equal to 43° and less than or equal to 47°, so that the first laser light 180 passing through the half-wave plate 141 and the second laser light 190 passing through the polarizer 142 can be more accurately combined on the surface of the polarizing film 144 facing away from the polarizer 142. Specifically, the included angle α between the first light emitting surface 1412 of the half-wave plate 141 and the second light emitting surface 1422 of the polarizer 142 can be 43.5°, 44°, 45°, 46°, etc., depending on the placement of the optical components of the laser pump source 100.

[0051] In some embodiments, an antireflection film 143 may be provided on the second light incident surface 1421 of the polarizer 142 to increase the transmittance of the second light incident surface 1421 of the polarizer 142. Specifically, an antireflection film 143 that transmits P light is provided on the second light incident surface of the polarizer 142.

[0052] As shown in FIG3 , a side edge of the half-wave plate 141 and a side edge of the polarizing plate 142 can be made close to and parallel to each other. Specifically, the half-wave plate 141 and the polarizing plate 142 are rectangular plates, the half-wave plate 141 includes a first side edge, the polarizing plate 142 includes a second side edge, the first side edge 1413 of the half-wave plate 141 and the second side edge 1423 of the polarizing plate 142 are arranged side by side and extend in parallel directions, the first side edge 1413 of the half-wave plate 141 and the second side edge 1423 of the polarizing plate 142 are close to each other, and in the direction in which the half-wave plate 141 moves away from the first side edge 1413, the distance between the first light emitting surface 1412 of the half-wave plate 141 and the second light emitting surface 1422 of the polarizing plate 142 gradually increases.

[0053] In some embodiments, the polarization beam splitter assembly 140 may further include a base (not shown), and the half-wave plate 141 and the polarizer 142 are respectively mounted on the base to maintain a stable relative position of the half-wave plate 141 and the polarizer 142. Specifically, the half-wave plate 141 is supported on the base on one side along the extension direction of the first side 1413, and the polarizer 142 is supported on the base on one side along the extension direction of the second side 1423, so that the first side 1413 of the half-wave plate 141 and the second side 1423 of the polarizer 142 are arranged side by side and their extension directions are parallel.

[0054] Of course, the polarization beam splitter prism assembly 140 may also include an angle adjustment mechanism (not shown in the figure), which is connected to the polarizer 142 and the half-wave plate 141, respectively, so as to maintain a stable relative position between the half-wave plate 141 and the polarizer 142. Moreover, the angle adjustment mechanism is also used to adjust the angle α between the first light emitting surface 1412 of the half-wave plate 141 and the second light emitting surface 1422 of the polarizer 142, so as to facilitate adjustment of the angle α between the first light emitting surface 1412 of the half-wave plate 141 and the second light emitting surface 1422 of the polarizer 142.

[0055] The following table is a temperature comparison table obtained after testing the polarization beam splitter prism assembly 140 provided in the embodiment of the present application and the existing integrated polarization beam splitter prism assembly at different laser bands and different light output powers. It can be seen from the table that in the same laser band, when the light output power is basically the same, the temperature of the half-wave plate 141 and the polarizer 142 of the polarization beam splitter prism assembly 140 provided in the embodiment of the present application are significantly lower than the temperature of the existing integrated polarization beam splitter prism assembly (also known as a coupled and bonded polarization beam splitter prism assembly), and the reduced temperature can reach about 20°C. Therefore, it can be seen that the polarization beam splitter prism assembly 140 provided in the embodiment of the present application can significantly improve the temperature rise compared to the existing polarization beam splitter prism assembly, which is beneficial to improving the service life and working stability of the polarization beam splitter prism assembly 140.

[0056] An embodiment of the present application also provides a laser pump source, which includes a polarization beam splitter prism assembly. The specific structure of the polarization beam splitter prism assembly refers to the above embodiment. Since this laser pump source adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0057] The laser pump source 100 includes a housing 110, a first laser assembly 120, and a second laser assembly 130. The housing 110 includes an optical cavity 1101. The first laser assembly 120 is disposed within the optical cavity 1101 and is configured to emit a first laser beam 180. The second laser assembly 130 is disposed within the optical cavity 1101 and is configured to emit a second laser beam 190. The first laser beam 180 is configured to be incident upon a first light incident surface 1411 of a half-wave plate 141 of a polarization beam splitter prism assembly 140, while the second laser beam 190 is configured to be incident upon a second light incident surface 1421 of a polarization plate 142 of the polarization beam splitter prism assembly 140. The polarization beam splitter prism assembly 140 may be any of the aforementioned embodiments and will not be further described herein.

[0058] In some embodiments, the first laser 180 and the second laser 190 are both P-light, so that after the first laser 180 is converted into S-light by the half-wave plate 141 , it is combined with the second laser 190 by the polarization beam splitter prism assembly 140 to form a combined beam of P-light and S-light.

[0059] The first laser assembly 120 includes multiple first laser chips 121, which are arranged in sequence. The lasers emitted by the multiple first laser chips 121 are spatially combined to form a first laser 180. The first laser chip 121 is a semiconductor laser chip, so the laser light emitted by the first laser chip 121 is P-light. The first laser 180 formed by spatially combining the laser light emitted by the multiple first laser chips 121 is also P-light. The laser light emitted by the multiple first laser chips 121 can be shaped along the fast and slow axes, and then rotated 90° by a reflector 150 for spatial combination to form the first laser 180.

[0060] Similarly, the second laser assembly 130 includes multiple second laser chips 131, which are arranged in sequence. The lasers emitted by the multiple second laser chips 131 are spatially combined to form a second laser 190. The second laser chips 131 are semiconductor laser chips, so the laser light emitted by the second laser chips 131 is P-light. The second laser 190 formed by spatially combining the laser light emitted by the multiple second laser chips 131 is also P-light. The laser light emitted by the multiple second laser chips 131 can be shaped along the fast and slow axes, and then rotated 90° by a reflector 150 for spatial combination to form the second laser 190.

[0061] As shown in Figure 1, the laser pump source 100 further includes a reflector 150 disposed within the optical cavity 1101. The reflector 150 is located in the optical path of the first laser 180 and is configured to reflect the first laser 180 toward the first light incident surface 1411 of the half-wave plate 141. This allows for greater flexibility in the placement of the first laser assembly 120 and the second laser assembly 130 within the laser pump source 100, thereby improving the structural compactness of the laser pump source 100.

[0062] Continuing with FIG1 , the laser pump source 100 further includes a beam expander assembly 160 disposed within the optical cavity 1101. The beam expander assembly 160 is located in the optical path of the second light-emitting surface 1422 of the polarizer 142. The beam expander assembly 160 is configured to expand the light emitted from the second light-emitting surface 1422 of the polarizer 142. Specifically, the beam expander assembly 160 is configured to receive the combined light beam output from the polarization beam splitting prism assembly 140 and expand or shrink the spot of the combined light beam.

[0063] In addition, the laser pump source 100 may further include a collimating lens assembly 170 disposed in the optical cavity 1101 . The collimating lens assembly 170 is used to collimate the laser beam expanded by the beam expander assembly 160 and transmit the collimated laser beam into the optical fiber.

[0064] Specifically, the multiple first laser chips 121 of the first laser assembly 120 and the multiple second laser chips 131 of the second laser assembly 130 can be arranged in the same direction. Furthermore, the first laser assembly 120 and the second laser assembly 130 are distributed on both sides of the polarization beam splitter prism assembly 140, and the beam expander assembly 160 and the collimator lens assembly 170 are distributed sequentially in a direction away from the polarization beam splitter prism assembly 140. Furthermore, the distribution direction of the polarization beam splitter prism assembly 140, the beam expander assembly 160, and the collimator lens assembly 170 is parallel to the arrangement direction of the multiple first laser chips 121.

[0065] 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.

[0066] The above is a detailed introduction to a polarization beam splitter prism assembly and a laser pump source provided in the embodiments of the present application. Specific examples are used herein 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. Those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

Claims

1. A polarization beam splitting prism assembly, wherein, The polarization beam splitting prism assembly includes: A half-wave plate, including a first light incident surface and a first light exit surface opposite to each other; A polarizer, including a second light incident surface and a second light exit surface opposite to each other. The second light exit surface is disposed opposite to the first light exit surface, and the included angle between the first light exit surface and the second light exit surface is an acute angle. A polarization film is provided on the second light exit surface, and the polarization film is used to transmit the light emitted from the second light exit surface and reflect the light emitted from the first light exit surface.

2. The polarization beam splitting prism assembly according to claim 1, wherein The first light incident surface and the second light incident surface are respectively used for P light to enter, and the polarization film is used to transmit P light and reflect S light.

3. The polarization beam splitting prism assembly according to claim 1, wherein, The first light incident surface and the second light incident surface are respectively used for S light to enter, and the polarization film is used to transmit S light and reflect P light.

4. The polarization beam splitting prism assembly according to claim 1, wherein, The included angle between the first light exit surface and the second light exit surface is greater than or equal to 43° and less than or equal to 47°.

5. The polarization beam splitting prism assembly according to claim 1, wherein, One side of the half-wave plate is close to and parallel to one side of the polarizer.

6. The polarization beam splitting prism assembly according to claim 1, wherein, An antireflection film is provided on the second light incident surface of the polarizer.

7. The polarization beam splitting prism assembly according to any one of claims 1 to 6, wherein, The polarization beam splitting prism assembly further includes a base, and the half-wave plate and the polarizer are respectively mounted on the base.

8. A laser pumping source, wherein, The laser pump source includes: A housing, and the housing includes an optical cavity; A first laser component, disposed in the optical cavity, and the first laser component is used to emit a first laser; A second laser component, disposed in the optical cavity, and the second laser component is used to emit a second laser; A polarization beam splitting prism assembly, disposed in the optical cavity. The polarization beam splitting prism assembly includes a half-wave plate and a polarizer. The half-wave plate includes a first light incident surface and a first light exit surface opposite to each other; the polarizer includes a second light incident surface and a second light exit surface opposite to each other. The second light exit surface is disposed opposite to the first light exit surface, and the included angle between the first light exit surface and the second light exit surface is an acute angle. A polarization film is provided on the second light exit surface, and the polarization film is used to transmit the light emitted from the second light exit surface and reflect the light emitted from the first light exit surface.

9. The laser pumping source according to claim 8, wherein, The first light incident surface and the second light incident surface are respectively used for P light to enter, and the polarization film is used to transmit P light and reflect S light.

10. The laser pumping source according to claim 8, wherein, The first light incident surface and the second light incident surface are respectively used for S light to enter, and the polarization film is used to transmit S light and reflect P light.

11. The laser pumping source according to claim 8, wherein, The included angle between the first light exit surface and the second light exit surface is greater than or equal to 43° and less than or equal to 47°.

12. The laser pumping source according to claim 8, wherein, One side of the half-wave plate is close to and parallel to one side of the polarizer.

13. The laser pumping source according to claim 8, wherein, An antireflection film is provided on the second light incident surface of the polarizer.

14. The laser pumping source according to claim 8, wherein, The laser pump source further includes a base, and the half-wave plate and the polarizer are respectively mounted on the base.

15. The laser pumping source according to claim 8, wherein, Both the first laser and the second laser are P light.

16. The laser pumping source according to claim 8, wherein, The laser pump source further includes a reflector and a beam expander assembly disposed in the optical cavity. The reflector is located on the optical path of the first laser and is used to reflect the first laser to the first light incident surface; the beam expander assembly is located on the optical path of the second light exit surface of the polarizer, and the beam expander assembly is used to expand the light emitted from the second light exit surface.

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