Pump module and solid-state laser having the same

Abstract

The present invention provides a pump module and a solid-state laser having the same. The pump module includes: a pump source, which is two and arranged side by side to provide a first laser and a second laser; a fast-axis collimation element, which is arranged on the light-emitting side of the pump source, and is used to perform fast-axis collimation on the first laser and the second laser; a polarization beam combining element, which is arranged on the light-emitting side of the fast-axis collimation element, and is used to make the polarization directions of the first laser and the second laser after fast-axis collimation perpendicular to each other and combine them to obtain a third laser; a slow-axis collimation element, which is arranged on the light-emitting side of the polarization beam combining element, and is used to perform slow-axis compression and convergence on the third laser to obtain an excitation source. On the one hand, the above-mentioned pump module can improve the beam quality of the slow-axis direction of the pump beam, and on the other hand, the dual pump sources form mutual backup and high-performance margin, avoiding the abnormality or failure of the pump source caused by the random failure of the light-emitting point of a single pump source, thereby being able to meet the high-reliability use requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps and solid-state lasers, and in particular to a pump module and a solid-state laser having the same. Background Art

[0002] The existing polarization beam combining technology is often used in fiber-coupled semiconductor laser modules. It requires the use of a beam conversion module (BTS) to rotate the slow axis direction of the beam by 90° to reduce the beam parameter product (BPP) in the slow axis direction, and then collimate the slow axis direction before performing polarization beam combining.

[0003] The above scheme first uses a slow axis collimator lens (SAC) to collimate the light beam in the slow axis direction, and then uses a polarization beam combiner (PBC) to perform polarization beam combining, thereby achieving less light loss in the slow axis direction and beam combining conversion efficiency; however, this technical solution requires the use of a BTS system, and can only use laser bars with a small number of light-emitting points (for example, a 1 cm bar with 19 light-emitting points), and because there are many optical elements (generally composed of FAC / BTS / SAC / PBC, where FAC is a fast axis collimator lens), a larger space is required, so it is generally used in fiber coupling modules; it is difficult to use in small passively Q-switched solid-state laser modules that have strict volume requirements and require high reliability.

[0004] Existing passive Q-switched solid-state laser solutions generally use a fiber-coupled module as a pump source, or use a single laser bar to directly couple the light to a crystal for pumping.

[0005] Passively Q-switched solid-state lasers that use fiber-coupled modules as pump sources, because the fiber-coupled modules and crystal modules (including optics, crystals, cavity mirrors, etc.) are separate, generally need to combine these two modules to work. The overall structure is too complex and large, and it is difficult to apply in some applications that require integrated applications and have strict volume requirements (such as vehicle-mounted lidar).

[0006] However, for passive solid-state lasers that use a single laser bar to directly couple the light output to a laser crystal for end-face pumping, the light output has a large asymmetry because the laser bar beam is longer in the slow axis direction. In addition, the failure of certain light-emitting points of a single laser bar will cause unevenness in the pump beam, thereby causing uneven output of the solid-state laser. Summary of the invention

[0007] The main purpose of the present invention is to provide a pump module and a solid-state laser having the same, so as to solve the problem that the laser in the prior art is bulky and has a complex structure.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a pump module is provided, comprising: a pump source, wherein two pump sources are arranged side by side and are used to provide a first laser and a second laser; a fast-axis collimation element is arranged on the light-emitting side of the pump source and is used to perform fast-axis collimation on the first laser and the second laser; a polarization beam combining element is arranged on the light-emitting side of the fast-axis collimation element and is used to make the polarization directions of the first laser and the second laser after fast-axis collimation perpendicular to each other and to combine them to obtain a third laser; and a slow-axis collimation element is arranged on the light-emitting side of the polarization beam combining element and is used to perform slow-axis compression and convergence on the third laser to obtain an excitation source.

[0009] Furthermore, the polarization beam combining element includes: a half-wave plate, arranged on the light-emitting side of the fast-axis collimation element, for rotating the polarization direction of the first laser after fast-axis collimation by 90°; a polarization beam combining mirror group, arranged on the light-emitting side of the half-wave plate, for combining the rotated first laser with the second laser after fast-axis collimation to obtain a third laser.

[0010] Furthermore, the two pump sources are respectively a first pump source providing a first laser and a second pump source providing a second laser, and the polarization beam combining mirror group includes: a first lens portion, located at the light exit side of the first pump source and arranged opposite to the first pump source; a second lens portion, located at the light exit side of the second pump source and arranged opposite to the second pump source, the first lens portion is used to reflect all of the first laser to the position of the second lens portion, and the second lens portion is used to reflect all of the first laser and transmit all of the second laser.

[0011] Furthermore, the arrangement direction of the first pump source and the second pump source is a first direction. In the first direction, the vertical distance between the two opposite end faces of the first pump source is L1, the vertical distance between the two opposite ends of the first lens portion is H1, the vertical distance between the two opposite end faces of the second pump source is L2, and the vertical distance between the two opposite ends of the second lens portion is H2, L1

[0012] Further, the pump sources are arranged in series.

[0013] Furthermore, the pump source is a laser bar.

[0014] Furthermore, there are two fast axis collimating elements, which are arranged in one-to-one correspondence with the light-emitting sides of the pump source.

[0015] Further, the fast-axis collimating element and the slow-axis collimating element are independently selected from any one of a cylindrical mirror, a spherical mirror and an aspherical mirror.

[0016] ​According to another aspect of the present invention, a solid-state laser is provided, comprising: the above-mentioned pump module, the pump module is used to generate an excitation source for realizing end-face pumping; and a crystal module, arranged on the light-emitting side of the slow-axis collimating element in the pump module, for receiving the excitation source and generating laser.

[0017] Further, the crystal module includes a gain medium crystal, a saturated absorption crystal and a resonant cavity, the resonant cavity is arranged on the light-emitting side of the slow axis collimation element, and the gain medium crystal and the saturated absorption crystal are arranged in the resonant cavity; or, the crystal module includes a gain medium crystal and a saturated absorption crystal, the gain medium crystal and the saturated absorption crystal form a composite crystal, the composite crystal is arranged on the light-emitting side of the slow axis collimation element, and in the light-emitting direction of the slow axis collimation element, two opposite end faces of the composite crystal form a resonant cavity.

[0018] The technical solution of the present invention is applied to provide a pump module, which adopts two pump sources arranged side by side and then performs polarization beam combining to obtain a pump light source with a single light spot; under the condition of dual pump sources, the polarization beam combining element can achieve the overlap of the output beams of the dual pump sources, which can improve the beam quality of the pump beam in the slow axis direction on the one hand, and on the other hand, the dual pump sources form mutual backup and high performance margin, avoiding the abnormality or failure of the pump source caused by the random failure of the light-emitting point of a single pump source, thereby meeting the high reliability use requirements. Furthermore, the present invention can make up for the light flux loss of polarization beam combining caused by the slow axis divergence angle by improving the PBC structure size and adopting a special arrangement design of the pump source and the PBC, thereby eliminating the beam conversion module (BTS) in the prior art; since the BTS is not used, a pump source with more light-emitting points can be used to achieve high peak power application requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 A schematic diagram showing the connection relationship of a solid-state laser provided in an embodiment of the present application is shown;

[0021] Figure 2 The diagram shows the positional relationship between a single pump source and a polarization beam combining mirror group in a solid-state laser provided in the prior art, and a schematic diagram of an optical path; and

[0022] Figure 3 The diagram shows the positional relationship between a single pump source and a polarization beam combining mirror assembly in a solid-state laser provided in an embodiment of the present application, as well as a schematic diagram of an optical path.

[0023] The above drawings include the following reference numerals:

[0024] 1', pump source; 4', polarization beam combiner; 1, pump source; 11, first pump source; 12, second pump source; 2, fast axis collimation element; 3, half-wave plate; 4, polarization beam combiner; 41, first lens section; 42, second lens section; 5, slow axis collimation element; 6, high-reflection lens; 7, gain medium crystal; 8, saturation absorption crystal; 9, partial reflection lens. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] As described in the background technology, the laser in the prior art is bulky and has a complex structure. The inventor of the present invention has studied the above problems and proposed a solid-state laser, such as Figure 1 As shown, it includes: a pump source 1, which is two and arranged side by side to provide a first laser and a second laser; a fast axis collimation element 2, which is arranged on the light-emitting side of the pump source 1 and is used to perform fast axis collimation on the first laser and the second laser; a polarization beam combining element, which is arranged on the light-emitting side of the fast axis collimation element 2 and is used to make the polarization directions of the first laser and the second laser after fast axis collimation perpendicular to each other and combine them to obtain a third laser; a slow axis collimation element 5, which is arranged on the light-emitting side of the polarization beam combining element and is used to perform slow axis compression and convergence on the third laser to obtain an excitation source.

[0029] In the above-mentioned pump module, two pump sources are arranged side by side and then polarization beam combining is performed to obtain a pump light source with a single light spot; under the condition of dual pump sources, the polarization beam combining element can achieve the overlap of the output beams of the dual pump sources, which can improve the beam quality of the pump beam in the slow axis direction on the one hand, and on the other hand, the dual pump sources form mutual backup and high-performance margin, avoiding the abnormality or failure of the pump source caused by the random failure of the light-emitting point of a single pump source, thereby meeting the high-reliability use requirements. Furthermore, the present invention can compensate for the light flux loss of polarization beam combining caused by the slow axis divergence angle by improving the structural size of the polarization beam combining mirror group (PBC) in the polarization beam combining element and adopting a special arrangement design of the pump source and the PBC, thereby eliminating the beam conversion module (BTS) in the prior art; since the BTS is not used, a pump source with more light-emitting points can be used to achieve high peak power application requirements.

[0030] In a preferred embodiment, Figure 1 As shown, the above-mentioned polarization beam combining element of the present invention includes a half-wave plate 3 and a polarization beam combining mirror group 4. The half-wave plate 3 is arranged on the light-emitting side of the fast-axis collimation element 2, and is used to rotate the polarization direction of the first laser after fast-axis collimation by 90°; the polarization beam combining mirror group 4 is arranged on the light-emitting side of the half-wave plate 3, and is used to combine the rotated first laser with the second laser after fast-axis collimation to obtain a third laser.

[0031] The two pump sources are respectively a first pump source 11 for providing a first laser and a second pump source 12 for providing a second laser. Preferably, the polarization beam combiner 4 comprises a first lens portion 41 and a second lens portion 42. The first lens portion 41 is located at the light-emitting side of the first pump source 11 and is arranged opposite to the first pump source 11, and is used to reflect all of the first laser to the position of the second lens portion 42; the second lens portion 42 is located at the light-emitting side of the second pump source 12 and is arranged opposite to the second pump source 12, and is used to fully reflect the first laser and fully transmit the second laser. Figure 3 shown.

[0032] The first lens portion 41 and the second lens portion 42 included in the above-mentioned polarization beam combining lens group 4 are the key technical functional parts of the present invention. The structure and optical performance of other parts of the polarization beam combining lens group 4 can be adaptively designed with reference to the existing structure, and the corresponding reflection or transmission or other related conditions can be met while ensuring that the technical scheme and technical objectives of the present invention can be achieved.

[0033] In the above preferred embodiment, the arrangement direction of the first pump source 11 and the second pump source 12 is taken as the first direction, and the special arrangement design of the two pump sources and the PBC can be: Figure 3As shown, in the first direction, the vertical distance between the two opposite end faces of the first pump source 11 is L1, the vertical distance between the two opposite ends of the first lens portion 41 is H1, the vertical distance between the two opposite end faces of the second pump source 12 is L2, and the vertical distance between the two opposite ends of the second lens portion 42 is H2, L1

[0034] In the embodiments of the present invention, the relationship between L1 and L2 is not explicitly and strictly limited. In order to facilitate design and production and to improve the technical purpose and technical effect of the present invention, L1=L2 and H1=H2 can be made. Of course, in some application scenarios where the technical effect is not strictly required, L1≠L2 and H1≠H2 are also allowed.

[0035] Since a single pump source (such as a fullbar) is usually used in the prior art, in order to ensure that all the light beams enter the device, the size of the polarization beam combiner 4' needs to completely correspond to the size of the pump source 1'. Figure 2 The single pump source shown in the figure has a misaligned beam due to the mismatch in size. Figure 2 The arrow of the outgoing light is shown in FIG. 1 . In the case of using a dual pump source, as shown in FIG. Figure 3 As shown, the structural dimensions of the polarization beam combining mirror group 4 are designed so that margins are left at both ends thereof compared with the pump source 1. Specifically, margins are left at the upper and lower parts of the polarization beam combining mirror group corresponding to one of the dual pump sources, and the dual pump sources are aligned with the centers of the parts corresponding to the polarization beam combining mirror group, respectively. The full angle of the slow axis divergence angle of the light beam is generally about 10°. The design with margins enables all light beams to enter the PBC for beam combining without using a beam conversion module (BTS), and the light spot output by the PBC can be non-misaligned.

[0036] In the above-mentioned pump module of the present invention, the pump source 1 can be a laser bar. Preferably, two pump sources 1 are arranged in series. That is, the negative electrode of one pump source 1 is connected to the positive electrode of another pump source 1, and the positive and negative electrodes that are not connected on the two pump sources 1 are respectively connected to the power supply. The two pump sources 1 connected in series only need a small driving current to achieve a large light output power, which greatly reduces the requirements for the power supply and also reduces the heat load in the system.

[0037] ​In addition, in the traditional fiber-coupled semiconductor laser module, a BTS (beam conversion module) is required to rotate the slow axis direction of the light beam by 90°, reduce the beam parameter product (BPP) in the slow axis direction, and then collimate the slow axis direction before performing polarization beam combining. This technical solution requires the use of a BTS system, and since each light-emitting point of the bar needs to correspond one-to-one with each unit in the BTS, only bars / single-tube chips with fewer light-emitting points can be used (for example, 19 light-emitting points are commonly used). The above-mentioned pump module of the present invention can overcome the disadvantage that the traditional polarization beam combining solution can only use bars with fewer light-emitting points, because BTS is not required, and the light-emitting points of the pump source 1 are not limited by the structure itself, so that the polarization beam combining technology can be applied to some bar lasers with more light-emitting points that require high peak power and quasi-continuous (QCW) operation.

[0038] In the above-mentioned pump module of the present invention, the fast axis collimating element 2 can be one located at the light-emitting side of the two pump sources 1, or two and arranged one-to-one corresponding to the light-emitting sides of the pump sources 1, such as Figure 1 The fast axis collimating element 2 and the slow axis collimating element 5 are independently selected from any one of a cylindrical mirror, a spherical mirror and an aspherical mirror.

[0039] The above-mentioned pump module of the present invention can be specifically used to generate an excitation source for realizing end-face pumping.

[0040] According to another aspect of the present invention, a solid-state laser is also provided. Figure 1 As shown, it includes the above-mentioned pump module and crystal module, the pump module is used to generate an excitation source for end-face pumping, and the crystal module is arranged on the light-emitting side of the slow-axis collimating element 5 in the pump module, and is used to receive the excitation source and generate laser. In the above-mentioned solid-state laser, after the light beams of the two pump sources are combined by PBC, a slow-axis collimating element 5 is used to converge the slow-axis direction, so that the light beams converge and enter the crystal module, and high-efficiency pumping is achieved.

[0041] The above-mentioned solid laser of the present invention can be a passively Q-switched end-pumped solid laser. Since the existing passively Q-switched end-pumped solid laser solutions generally use a fiber coupling module as a pump source, or use a single bar to directly couple the light output to the crystal for pumping, which easily leads to problems of bulky volume and uneven light output. The above-mentioned pump module of the present invention adopts an improved polarization beam combining technology, which solves the shortcomings of the traditional polarization beam combining solution that can only use bars with fewer light-emitting points and the need to use BTS, resulting in a complex and bulky optical system. The improved polarization beam combining solution has a compact volume and low light flux loss, and can be applied to small passively Q-switched solid lasers with strict requirements on volume and efficiency.

[0042] Moreover, in the above-mentioned dynamically Q-switched solid-state laser of the present invention, PBC can be used to directly combine light beams that have not been collimated in the slow axis direction. By improving the structural dimensions of PBC and adopting a special arrangement design of dual pump sources and PBC, the light flux loss of polarization combining caused by the slow axis divergence angle is compensated. Since BTS is not used, chips with more light-emitting points can be used to meet high peak power application requirements.

[0043] At the same time, in this scheme, two bars are arranged side by side (and further arranged in series) for polarization beam combining to realize a single-spot pump light source; under the condition of dual pump sources, PBC can realize the overlap of the dual pump source beams, which can improve the beam quality of the pump beam in the slow axis direction on the one hand, and on the other hand, the dual pump sources form mutual backup and high-performance margin, avoiding pump anomalies or failures caused by random failure of a single bar light point, solving the problems of poor beam symmetry and poor reliability of passive Q-switched solid-state lasers directly coupled with a single bar, and meeting the requirements for high reliability use.

[0044] The excitation source for end-face pumping generated by the pump module can be incident on one end of the left and right end faces of the crystal module close to the excitation source to realize an end-face pumped solid-state laser. Specifically:

[0045] In a preferred embodiment, the crystal module includes a gain medium crystal 7, a saturated absorption crystal 8 and a resonant cavity, the resonant cavity is arranged on the light-emitting side of the slow axis collimating element 5, and the gain medium crystal 7 and the saturated absorption crystal 8 are arranged in the resonant cavity. Those skilled in the art can reasonably select the types of the gain medium crystal 7 and the saturated absorption crystal 8 according to the prior art, which will not be described in detail here.

[0046] In another preferred embodiment, the crystal module includes a gain medium crystal 7 and a saturated absorption crystal 8, and the gain medium crystal 7 and the saturated absorption crystal 8 form a composite crystal, which is arranged on the light-emitting side of the slow axis collimating element 5, and in the light-emitting direction of the slow axis collimating element 5, the two opposite end faces of the composite crystal form a resonant cavity. In this case, the resonant cavity is formed by the structure of the crystal itself, and there is no need to set up a resonant cavity mirror separately, so that the structure of the laser is simpler and more compact.

[0047] The resonant cavity of the present invention can be composed of two independent cavity mirrors (high-reflection mirror 6 and partial reflection mirror 9). When similar purposes can be achieved, the high-reflection mirror 6 and partial reflection mirror 9 can also be formed by two end faces of a crystal, as long as the two end faces meet the reflectivity conditions.

[0048] The above-mentioned pump module and the solid-state laser having the same of the present invention will be further described below in conjunction with embodiments.

[0049] Example 1

[0050] This embodiment adopts Figure 1 The solid-state laser shown in the figure mainly includes:

[0051] As the dual pump source 1, there are two semiconductor laser bars, a fast axis collimation element 2 which is two fast axis collimation lenses, a half-wave plate 3, a polarization beam combiner 4, a slow axis collimation element 5 which is a cylindrical mirror, a gain medium crystal 7, a saturated absorption crystal 8, and a resonant cavity mirror composed of a high reflection lens 6 and a partial reflection lens 9. Among them, the two bars are placed side by side, and the fast axis collimation of the light beam is performed by a fast axis collimation lens respectively; the half-wave plate is placed at the front end of one of the bars to achieve a 90° rotation of the polarization direction of the light beam of the bar; the light beam with a 90-degree rotation of polarization and the light beam of the other bar are combined into the same light beam through the polarization beam combiner; the combined light beam is compressed and converged in the slow axis direction by a cylindrical mirror and then incident on the end face of the gain medium crystal for pumping.

[0052] The two bars are placed side by side and are electrically connected in series. Compared with a longer single bar or two parallel bars, two bars connected in series require a smaller driving current to achieve a higher optical output power and reduce the heat load in the system.

[0053] In addition, the polarization beam combiner (PBC) can achieve the overlap of two bar beams as dual pump sources. On the one hand, it can improve the beam quality of the pump beam in the slow axis direction. On the other hand, the dual pump sources form mutual backup and high-performance margin, avoiding pump anomalies or failures caused by random failure of a single bar light point, and can meet high-reliability usage requirements.

[0054] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0055] 1. In the above-mentioned pump module, two pump sources are arranged side by side and then polarization beam combining is performed to obtain a pump light source with a single light spot; under the condition of dual pump sources, the polarization beam combining element can realize the overlap of the output beams of the dual pump sources, which can improve the beam quality of the pump beam in the slow axis direction on the one hand, and on the other hand, the dual pump sources form mutual backup and high-performance margin, avoiding the abnormality or failure of the pump source caused by the random failure of the light-emitting point of a single pump source, thereby meeting the high reliability requirements;

[0056] 2. By improving the structural dimensions of the polarization beam combiner (PBC) in the slow axis collimation element and adopting a special arrangement design of the pump source and the PBC, the light flux loss of the polarization beam combiner caused by the slow axis divergence angle is compensated, thereby eliminating the beam conversion module (BTS) in the prior art; since the BTS is not used, a pump source with more light points can be used to meet the application requirements of high peak power;

[0057] 3. Since the existing passive Q-switched solid-state laser solutions generally use fiber coupling modules as pump sources, or use a single bar to directly couple the light to the crystal for pumping, it is easy to cause problems such as bulky volume and uneven light output. The above-mentioned pump module of the present invention adopts improved polarization beam combining technology, which solves the shortcomings of traditional polarization beam combining solutions that can only use bars with fewer light-emitting points and require the use of BTS, resulting in a complex and bulky optical system. The improved polarization beam combining solution has a compact volume and low light flux loss, and can be applied to small passive Q-switched end-pumped solid-state lasers with strict requirements on volume and efficiency.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pump module, characterized in that: include: A pump source (1), wherein the pump sources (1) are two and arranged side by side, and are used to provide a first laser and a second laser; A fast axis collimation element (2), arranged on the light output side of the pump source (1), and used for fast axis collimating the first laser and the second laser; A polarization beam combining element, arranged on the light output side of the fast axis collimating element (2), used to make the polarization directions of the first laser and the second laser after fast axis collimation perpendicular to each other and combine them to obtain a third laser; A slow axis collimating element (5) is arranged on the light output side of the polarization beam combining element and is used for performing slow axis compression and convergence on the third laser to obtain an excitation source; The polarization beam combining element comprises: a half-wave plate (3), arranged on the light-exiting side of the fast-axis collimating element (2), and used for rotating the polarization direction of the first laser after fast-axis collimation by 90°; a polarization beam combining lens group (4), arranged on the light-exiting side of the half-wave plate (3), and used for combining the rotated first laser with the second laser after fast-axis collimation to obtain the third laser; The two pump sources (1) are respectively a first pump source (11) for providing the first laser and a second pump source (12) for providing the second laser. The polarization beam combining lens group (4) comprises: a first lens portion (41) located at the light exit side of the first pump source (11) and arranged opposite to the first pump source (11); a second lens portion (42) located at the light exit side of the second pump source (12) and arranged opposite to the second pump source (12). The first lens portion (41) is used to reflect all of the first laser to the position of the second lens portion (42), and the second lens portion (42) is used to reflect all of the first laser and transmit all of the second laser. The arrangement direction of the first pump source (11) and the second pump source (12) is a first direction. In the first direction, the vertical distance between the two opposite end faces of the first pump source (11) is L1, the vertical distance between the two opposite ends of the first lens portion (41) is H1, the vertical distance between the two opposite end faces of the second pump source (12) is L2, and the vertical distance between the two opposite ends of the second lens portion (42) is H2, L1<H1, L2<H2; the midpoint of L1 is A1, the midpoint of H1 is B1, the midpoint of L2 is A2, the midpoint of H2 is B2, and the line connecting A1 and B1 is perpendicular to the first direction.

2. The pump module according to claim 1, characterized in that: The pump sources (1) are arranged in series.

3. The pump module according to any one of claims 1 to 2, characterized in that: The pump source (1) is a laser bar.

4. The pump module according to claim 1, characterized in that: There are two fast axis collimating elements (2) which are arranged in one-to-one correspondence with the light output sides of the pump source (1).

5. The pump module according to claim 1 or 4, characterized in that: The fast axis collimating element (2) and the slow axis collimating element (5) are independently selected from any one of a cylindrical mirror, a spherical mirror and an aspherical mirror.

6. A solid-state laser, characterized in that: include: The pump module according to any one of claims 1 to 5, wherein the pump module is used to generate an excitation source for realizing end-face pumping; The crystal module is arranged on the light-emitting side of the slow-axis collimating element (5) in the pump module and is used to receive the excitation source and generate laser light.

7. The solid-state laser according to claim 6, characterized in that: The crystal module comprises a gain medium crystal (7), a saturated absorption crystal (8) and a resonant cavity, wherein the resonant cavity is arranged on the light output side of the slow axis collimating element (5), and the gain medium crystal (7) and the saturated absorption crystal (8) are arranged in the resonant cavity; or, The crystal module comprises a gain medium crystal (7) and a saturated absorption crystal (8), wherein the gain medium crystal (7) and the saturated absorption crystal (8) form a composite crystal, the composite crystal is arranged on the light-emitting side of the slow axis collimating element (5), and in the light-emitting direction of the slow axis collimating element (5), two opposite end faces of the composite crystal form a resonant cavity.

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