Pump module and laser

Abstract

The embodiment of the invention provides a pumping module and a laser. The pumping module comprises pumping sources, light uniformizing assemblies and a laser gain crystal, the pumping sources are used for emitting pumping light, the pumping sources are arranged at intervals along the periphery of the laser gain crystal, the light uniformizing assemblies are arranged between the pumping sources and the laser gain crystal, the light uniformizing assemblies are light-permeable, and the light uniformizing assemblies are used for enabling the pumping light to pass through and uniformizing the pumping light; the laser gain crystal is used for receiving the pump light emitted by the pump source and homogenized by the light homogenizing assembly. According to the pumping module and the light uniformizing assembly in the embodiment of the invention, the pumping module and the light uniformizing assembly are arranged between the pumping source and the laser gain crystal, so that the pumping light passing through the light uniformizing assembly is uniformized, and the uniformized pumping light is irradiated on the laser gain crystal, thereby avoiding overlarge local thermal stress of the laser gain crystal, and enabling the energy utilization rate of the pumping module to be high and the gain to be uniform.

Description

Technical Field

[0001] The invention relates to the field of lasers, and in particular to a pump module and a laser. Background Art

[0002] The pump module is the main component of the laser. In the related art, the pump module includes a rod-shaped laser gain crystal and at least two pump sources arranged on the periphery of the laser gain crystal. The pump sources generate pump light and directly irradiate the laser gain crystal. However, the pump module in the related art has the problem of uneven distribution of the light intensity of the pump light, which leads to excessive local thermal stress of the laser gain crystal, low energy utilization and uneven gain. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a pump module.

[0005] An embodiment of the present invention further provides a laser.

[0006] The pump module of the embodiment of the present invention comprises:

[0007] A pump source, a light homogenizing component and a laser gain crystal, wherein the pump source is used to emit pump light, a plurality of the pump sources are arranged at intervals along the periphery of the laser gain crystal, the light homogenizing component is arranged between the pump source and the laser gain crystal, the light homogenizing component is light-transmissive, the light homogenizing component is used to allow the pump light to pass through and homogenize the pump light, and the laser gain crystal is used to receive the pump light emitted by the pump source and homogenized by the light homogenizing component.

[0008] In the pump module of the embodiment of the present invention, the light homogenizing component is arranged between the pump source and the laser gain crystal to homogenize the pump light passing through the light homogenizing component so that the homogenized pump light is irradiated on the laser gain crystal, thereby avoiding excessive local thermal stress of the laser gain crystal and making the energy utilization rate of the pump module high and the gain uniform.

[0009] In some embodiments, the light homogenizing component includes a first light homogenizing lens, the first light homogenizing lens is light-transmissive, the first light homogenizing lens has a convex or concave first lens unit, or the first light homogenizing lens has a first scattering microstructure.

[0010] In some embodiments, the light homogenizing component also includes a second light homogenizing lens, which is translucent, and the first light homogenizing lens and the second light homogenizing lens are arranged in sequence along the direction from the pump source to the laser gain crystal, and the second light homogenizing lens has a convex or concave second lens unit, or the second light homogenizing lens has a second scattering microstructure.

[0011] In some embodiments, the first lens units are multiple and arranged in an array, the second lens units are multiple and arranged in an array, and the widths of the first lens units and the second lens units are both 10 micrometers to 999 micrometers.

[0012] In some embodiments, the first lens unit and the second lens unit are one of a convex lens, a concave lens, a Fresnel lens, and a honeycomb mirror.

[0013] In some embodiments, the first scattering microstructure is a rough surface formed on the first light homogenizing lens by sandblasting or chemical etching, and the second scattering microstructure is a rough surface formed on the second light homogenizing lens by sandblasting or chemical etching.

[0014] In some embodiments, the first light homogenizing lens is disposed corresponding to the pump source;

[0015] The pump module also includes a reflector, which includes a plurality of reflectors arranged at intervals along the periphery of the laser gain crystal. The reflectors and the first light homogenizing lenses are alternately arranged and surround the periphery of the laser gain crystal. The reflectors are used to reflect the pump light away from the laser gain crystal.

[0016] In some embodiments, the second light homogenizing lens surrounds the outer periphery of the laser gain crystal, and the reflective elements and the first light homogenizing lens arranged alternately surround the outer periphery of the second light homogenizing lens.

[0017] In some embodiments, the laser gain crystal is rod-shaped, the reflective element and the first light homogenizing lens are both arc-shaped plates extending along the axial direction of the laser gain crystal and bent along the circumference of the laser gain crystal, and the second light homogenizing lens is tubular extending along the axial direction of the laser gain crystal.

[0018] In some embodiments, the space between the second light homogenizing lens and the laser gain crystal is used for a cooling medium to pass through, and the cooling medium is light-transmissive.

[0019] In some embodiments, the reflector further includes a connecting ring, the connecting ring surrounds the outer circumference of the laser gain crystal, the connecting ring is connected to the same end of at least two of the reflective sheets, and the first light homogenizing lens is connected between two adjacent reflective sheets;

[0020] The pump module further includes a mounting base, and the pump source, the connecting ring, at least one axial end of the second light homogenizing lens, and at least one axial end of the laser gain crystal are all connected to the mounting base.

[0021] The laser according to the embodiment of the present invention includes: the pump module according to any one of the above embodiments.

[0022] The laser of the embodiment of the present invention adopts the pump module of the embodiment of the present invention, so the laser gain crystal is not easily damaged, so that the laser of the embodiment of the present invention has a long service life, high energy utilization and uniform gain. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of a pump module according to an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of the first light homogenizing lens and the reflective element;

[0025] Figure 3 yes Figure 1 Schematic diagram of the second light homogenizing lens;

[0026] Figure 4 is a schematic diagram of a first lens unit and a second lens unit using a honeycomb mirror in a pump module according to an embodiment of the present invention;

[0027] FIG5( a ) is a schematic diagram of pump light irradiated on a laser gain crystal in a pump module of the related art;

[0028] FIG. 5( b ) is a schematic diagram of pump light irradiated onto a laser gain crystal in a pump module according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] 1. Pump source; 2. Homogenizing assembly; 21. First homogenizing lens; 211. First lens unit; 22. Second homogenizing lens; 221. Second lens unit; 3. Laser gain crystal; 4. Reflector; 41. Reflector; 42. Connecting ring; 5. Installation base. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0032] Reference below Figure 1-Figure 5(b) A pump module and a laser according to embodiments of the present invention are described.

[0033] like Figure 1-Figure 5(b) As shown, the pump module of the embodiment of the present invention includes a pump source 1 , a light homogenizing component 2 and a laser gain crystal 3 .

[0034] The pump source 1 is used to emit pump light, and a plurality of pump sources 1 are arranged at intervals along the periphery of the laser gain crystal 3. For example, Figure 1 As shown, the pump sources 1 are preferably, but not limited to, three arranged at intervals along the periphery of the laser gain crystal 3 .

[0035] The light homogenizing component 2 is disposed between the pump source 1 and the laser gain crystal 3. The light homogenizing component 2 is light-transmissive. In other words, the light homogenizing component 2 is transparent. The light homogenizing component 2 is used to allow the pump light to pass through and homogenize the pump light. The laser gain crystal 3 is used to receive the pump light emitted by the pump source 1 and homogenized by the light homogenizing component 2.

[0036] FIG. (a) is a schematic diagram of the pump light irradiated on the laser gain crystal in the pump module of the related art. The peak power of the pump light of the related art is concentrated and presents a Gaussian beam shape.

[0037] As shown in Figure (b), it is a schematic diagram of the pump light irradiated on the laser gain crystal in the pump module of an embodiment of the present invention. The pump light in the pump module of the embodiment of the present invention is homogenized to be in the shape of a flat-top beam to avoid excessive peak power damaging the laser gain crystal 3.

[0038] In the pump module of the embodiment of the present invention, the light homogenizing component is arranged between the pump source and the laser gain crystal to homogenize the pump light passing through the light homogenizing component so that the homogenized pump light is irradiated on the laser gain crystal, thereby avoiding excessive local thermal stress of the laser gain crystal and making the energy utilization rate of the pump module high and the gain uniform.

[0039] In some embodiments, the light homogenizing component 2 includes a first light homogenizing lens 21, the first light homogenizing lens 21 is light-transmissive, the first light homogenizing lens 21 has a convex or concave first lens unit 211, or the first light homogenizing lens 21 has a first scattering microstructure.

[0040] In such Figure 1 and Figure 2 In the example shown, the light homogenizing component 2 includes a first light homogenizing lens 21 that is translucent. In other words, the first light homogenizing lens 21 is transparent. The first light homogenizing lens 21 is disposed between the pump source 1 and the laser gain crystal 3. The first light homogenizing lens 21 has a first lens unit 211 that is convex or concave along the arrangement direction of the first light homogenizing lens 21 and the laser gain crystal 3. The first lens unit 211 can be disposed on the end face of the first light homogenizing lens 21 facing the laser gain crystal 3, or on the end face of the first light homogenizing lens 21 away from the laser gain crystal 3.

[0041] It can be understood that the first light homogenizing lens 21 is not limited to having a first lens unit 211. In other embodiments, the first light homogenizing lens 21 has a first scattering microstructure, and the first scattering microstructure can be arranged on the end face of the first light homogenizing lens 21 facing the laser gain crystal 3, and can also be arranged on the end face of the first light homogenizing lens 21 away from the laser gain crystal 3.

[0042] The pump light emitted by the pump source 1 passes through the first light homogenizing lens 21 when irradiating the laser gain crystal 3 . The first lens unit 211 or the first scattering microstructure homogenizes the pump light emitted by the pump source 1 when passing through the first light homogenizing lens 21 .

[0043] In some embodiments, the light homogenizing component 2 also includes a second light homogenizing lens 22, which is translucent. The first light homogenizing lens 21 and the second light homogenizing lens 22 are arranged in sequence along the direction from the pump source 1 to the laser gain crystal 3. The second light homogenizing lens 22 has a convex or concave second lens unit 221, or the second light homogenizing lens 22 has a second scattering microstructure.

[0044] In such Figure 1 and Figure 3 In the example shown, the light homogenizing component 2 further includes a second light homogenizing lens 22 that is translucent. In other words, the second light homogenizing lens 22 is transparent. The second light homogenizing lens 22 is disposed between the first light homogenizing lens 21 and the laser gain crystal 3. The second light homogenizing lens 22 has a second lens unit 221 that is convex or concave along the arrangement direction of the second light homogenizing lens 22 and the laser gain crystal 3. The second lens unit 221 can be disposed on the end face of the second light homogenizing lens 22 facing the laser gain crystal 3, or on the end face of the second light homogenizing lens 22 away from the laser gain crystal 3.

[0045] It can be understood that the second light homogenizing lens 22 is not limited to having a second lens unit 221. In other embodiments, the second light homogenizing lens 22 has a second scattering microstructure, and the second scattering microstructure can be arranged on the end face of the second light homogenizing lens 22 facing the laser gain crystal 3, and can also be arranged on the end face of the second light homogenizing lens 22 away from the laser gain crystal 3.

[0046] The pump light emitted by the pump source 1 passes through the first homogenizing lens 21 and the second homogenizing lens 22 in sequence during the process of irradiating the laser gain crystal 3. The first lens unit 211 or the first scattering microstructure makes the pump light emitted by the pump source 1 homogenized for the first time when passing through the first homogenizing lens 21. The second lens unit 221 or the second scattering microstructure makes the pump light after the first homogenization be homogenized for the second time when passing through the second homogenizing lens 22, thereby ensuring the homogenizing effect of the homogenizing component on the pump light.

[0047] In some embodiments, a plurality of first lens units 211 are arranged in an array, and a plurality of second lens units 221 are arranged in an array. The widths of the first lens units 211 and the second lens units 221 are both 10 micrometers to 999 micrometers.

[0048] like Figure 1-Figure 3As shown, the first lens unit 211 and the second lens unit 221 are arranged in an array, such as a rectangular array, an annular array, a circular array, a grid array, etc.

[0049] The widths of the first lens unit 211 and the second lens unit 221 are both 10 micrometers to 999 micrometers, such as 10 micrometers, 80 micrometers, 100 micrometers, 300 micrometers, 500 micrometers, 650 micrometers, 850 micrometers, 999 micrometers, etc. The widths of the first lens unit 211 and the second lens unit 221 refer to the distance between the two farthest sides of the projection of the first lens unit 211 and the projection of the second lens unit 221, or the diameters of the projection of the first lens unit 211 and the projection of the second lens unit 221.

[0050] The pump light emitted by the pump source 1 passes through a plurality of first lens units 211 and a plurality of second lens units 221 in sequence. For example, a 0.5 mm pump light spot can pass through 5 to 10 first lens units 211 and 5 to 10 second lens units 221 in sequence. Thus, the pump light is divided into many small parts by the plurality of first lens units 211 and the plurality of second lens units 221 and is focused on the focal plane so that the light spots overlap, thereby achieving homogenization of the light spots. In other words, the pump light is irradiated on the laser gain crystal to form a plurality of light spots in the shape of a flat top beam as shown in Figure (b).

[0051] In some embodiments, the first lens unit 211 and the second lens unit 221 are one of a convex lens, a concave lens, a Fresnel lens, and a honeycomb lens.

[0052] like Figure 4 The first lens unit 211 and the second lens unit 221 are preferably, but not limited to, honeycomb lenses. Specifically, the projections of the first lens unit 211 and the second lens unit 221 are both regular hexagons. In the projection of the first lens unit 211, one end corresponding to each side line of the regular hexagon is connected to another first lens unit 211. In the projection of the second lens unit 221, one end corresponding to each side line of the regular hexagon is connected to another second lens unit 221.

[0053] Preferably, the first lens unit 211 is formed on the surface of the first light homogenizing lens 21 by laser etching, chemical corrosion or molding, and the first lens unit 211 is formed on the surface of the second light homogenizing lens 22 by laser etching, chemical corrosion or molding.

[0054] In some embodiments, the first scattering microstructure is a rough surface formed on the first light homogenizing lens 21 by a sandblasting process or a chemical etching process. The rough surface of the first scattering microstructure can be formed on the end face of the first light homogenizing lens 21 facing the laser gain crystal 3, or can be formed on the end face of the first light homogenizing lens 21 away from the laser gain crystal 3.

[0055] The second scattering microstructure is a rough surface formed on the second light homogenizing lens 22 by a sandblasting process or a chemical etching process. The rough surface of the second scattering microstructure can be formed on the end face of the second light homogenizing lens 22 facing the laser gain crystal 3, or on the end face of the second light homogenizing lens 22 away from the laser gain crystal 3.

[0056] Preferably, the size of the rough particles of the rough surface is 10 microns to 999 microns.

[0057] In some embodiments, the first light homogenizing lens 21 is arranged corresponding to the pump source 1. The pump module further includes a reflector 4, which includes a plurality of reflectors 41 arranged at intervals along the periphery of the laser gain crystal 3. The reflectors 41 and the first light homogenizing lens 21 are alternately arranged and surround the periphery of the laser gain crystal 3. The reflectors 41 are used to reflect the pump light away from the laser gain crystal 3.

[0058] like Figure 1 and Figure 2 As shown, the number of first light homogenizing lenses 21 is preferably, but not limited to, three arranged corresponding to the pump sources 1 , and the three pump sources 1 surround the periphery of the laser gain crystal 3 , preferably arranged equidistantly.

[0059] The first light homogenizing lens 21 is arranged corresponding to the pump source 1 to ensure that the pump light emitted by the pump source 1 passes through and is homogenized by the first light homogenizing lens 21. The three pump sources 1 are arranged equidistantly to ensure that the pump light emitted by the three pump sources 1 is uniformly irradiated on the surface of the laser gain crystal 3 after being homogenized, so as to avoid excessive local thermal stress.

[0060] The pump module further includes a reflector 4 , at least a portion of which is located between the pump source 1 and the laser gain crystal 3 .

[0061] The reflector 4 includes at least two reflectors 41, preferably three, disposed between the pump source 1 and the laser gain crystal 3 and spaced around the laser gain crystal 3. The reflectors 41 and the first light homogenizing lenses 21 are alternately disposed and surround the outer periphery of the laser gain crystal 3. In other words, the reflectors 41 and the first light homogenizing lenses 21 are alternately disposed in a ring shape and surround the outer periphery of the laser gain crystal 3. At least the wall surface of the reflector 41 facing the laser gain crystal 3 can reflect the pump light.

[0062] A second light homogenizing lens 22 may be arranged between the alternately arranged reflective element 4 and the first light homogenizing lens 21 and the laser gain crystal 3 , or the second light homogenizing lens 22 may not be arranged. Preferably, the second light homogenizing lens 22 is arranged.

[0063] When the pump light emitted by the pump source 1 irradiates the surface of the laser gain crystal 3, most of the pump light is absorbed by the laser gain crystal 3, a small part of the pump light is reflected by the surface of the laser gain crystal 3, and a small part of the pump light passes through the laser gain crystal 3. The pump light passing through the laser gain crystal 3 and the pump light reflected by the laser gain crystal 3 are irradiated on the reflective sheet 41 and reflected again by the reflective sheet 41, so that the reflected pump light is re-irradiated on the surface of the laser gain crystal 3 and is mostly absorbed, thereby ensuring that the pump light is absorbed by the laser gain crystal 3 through the reflection of the reflective sheet 41, thereby improving energy utilization.

[0064] It is understandable that the first light homogenizing lens is not limited to being arranged alternately with the reflective sheet. In other embodiments, the first light homogenizing lens is arranged in a ring shape and surrounds the outer circumference of the laser gain crystal, and at least two reflective sheets are arranged at intervals around the first light homogenizing lens.

[0065] In some embodiments, the second light homogenizing lens 22 surrounds the outer periphery of the laser gain crystal 3 , and the reflective elements 4 and the first light homogenizing lenses 21 arranged alternately surround the outer periphery of the second light homogenizing lens 22 .

[0066] like Figure 1-Figure 3 As shown, the second light homogenizing lens 22 is arranged in a ring shape and surrounds the outer periphery of the laser gain crystal 3 , and the reflective elements 4 and the first light homogenizing lenses 21 arranged alternately surround the outer periphery of the second light homogenizing lens 22 .

[0067] The second light homogenizing lens 22 is arranged in a ring shape so that the pump light reflected by the reflective sheet 41 passes through the second light homogenizing lens 22 again and is homogenized, thereby ensuring the homogenization effect of the pump light.

[0068] It can be understood that the second light homogenizing lens is not limited to being arranged in a ring shape. In other embodiments, the second light homogenizing lens is at least two arranged corresponding to the first light homogenizing lens.

[0069] In some embodiments, the laser gain crystal 3 is rod-shaped, the reflector 4 and the first light homogenizing lens 21 are both arc-shaped plates extending along the axial direction of the laser gain crystal 3 and bent along the circumference of the laser gain crystal 3, and the second light homogenizing lens 22 is tubular extending along the axial direction of the laser gain crystal 3.

[0070] like Figure 1-Figure 3 As shown, the laser gain crystal 3 is in the shape of a rod extending in the left-right direction, preferably in the shape of a round rod. The reflector 4 and the first light homogenizing lens 21 are both in the shape of an arc plate extending in the left-right direction and bent around the left-right direction, so that the reflector 4 and the first light homogenizing lens 21 are alternately arranged in the shape of a round tube. The second light homogenizing lens 22 is in the shape of a tube extending along the axial direction of the laser gain crystal 3, preferably in the shape of a round tube. This ensures that the pump light is evenly irradiated on the surface of the laser gain crystal 3, and the laser gain crystal 3 can be activated to generate laser light.

[0071] In some embodiments, the space between the second light homogenizing lens 22 and the laser gain crystal 3 is used for the passage of a cooling medium, and the cooling medium is light-transmissive.

[0072] like Figure 1 As shown, the tubular second light homogenizing lens 22 is used for the cooling medium to pass through, and the cooling medium contacts and exchanges heat with the laser gain crystal 3 to cool the laser gain crystal 3 .

[0073] The cooling medium is light-transmissive, in other words, the cooling medium is transparent so that the pump light can pass through the cooling medium. The cooling medium is preferably, but not limited to, water.

[0074] In some embodiments, the reflector 4 further includes a connecting ring 42, which surrounds the outer periphery of the laser gain crystal 3, is connected to the same end of at least two reflective sheets 41, and the first light homogenizing lens 21 is connected between two adjacent reflective sheets 41. The pump module further includes a mounting base 5, and the pump source 1, the connecting ring 42, at least one axial end of the second light homogenizing lens 22, and at least one axial end of the laser gain crystal 3 are all connected to the mounting base 5.

[0075] like Figure 1-Figure 3 As shown, the reflector 4 also includes a connecting ring 42, which is a ring-shaped ring around the left and right directions and surrounds the outer circumference of the laser gain crystal 3. The connecting ring 42 is connected to the left ends of the three reflective sheets 41, thereby playing the role of installing and fixing the reflective sheets 41.

[0076] The first light homogenizing lens 21 is connected between two adjacent reflective sheets 41 , and preferably, the first light homogenizing lens 21 is connected between the inner wall surfaces of two adjacent reflective sheets 41 , so as to facilitate the installation and fixing of the first light homogenizing lens 21 .

[0077] The installation base 5 is preferably, but not limited to, a shell. The pump source 1 is arranged on the inner wall surface of the installation base 5. The connecting ring 42, the left end of the second light homogenizing lens 22, and the left end of the laser gain crystal 3 are all connected to the installation base 5, so that the pump source 1, the light homogenizing component 2, the laser gain crystal 3 and the reflector 4 are installed and fixed. At the same time, the shell of the installation base 5 also plays a shading role to prevent the pump light from being affected by external natural light.

[0078] like Figure 1-Figure 5(b) As shown, the laser according to the embodiment of the present invention includes the pump module according to the embodiment of the present invention.

[0079] The laser of the embodiment of the present invention adopts the pump module of the embodiment of the present invention, so the laser gain crystal is not easily damaged, so that the laser of the embodiment of the present invention has a long service life, high energy utilization and uniform gain.

[0080] In the description of the present invention, it is necessary to understand that the terms "center", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 a limitation on the present invention.

[0081] In addition, the terms "first" and "second" are only used for distinction, 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 at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0082] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0084] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0085] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A pump module, characterized in that: include: A pump source (1), a light homogenizing component (2) and a laser gain crystal (3), wherein the pump source (1) is used to emit pump light, a plurality of the pump sources (1) are arranged at intervals along the periphery of the laser gain crystal (3), the light homogenizing component (2) is arranged between the pump source (1) and the laser gain crystal (3), the light homogenizing component (2) is light-transmissive, the light homogenizing component (2) is used to allow the pump light to pass through and homogenize the pump light, and the laser gain crystal (3) is used to receive the pump light emitted by the pump source (1) and homogenized by the light homogenizing component (2).

2. The pump module according to claim 1, characterized in that: The light homogenizing component (2) comprises a first light homogenizing lens (21), the first light homogenizing lens (21) is light-transmissive, the first light homogenizing lens (21) has a convex or concave first lens unit (211), or the first light homogenizing lens (21) has a first scattering microstructure.

3. The pump module according to claim 2, characterized in that: The light homogenizing component (2) further comprises a second light homogenizing lens (22), the second light homogenizing lens (22) is light-transmissive, the first light homogenizing lens (21) and the second light homogenizing lens (22) are arranged in sequence along the direction from the pump source (1) to the laser gain crystal (3), the second light homogenizing lens (22) has a convex or concave second lens unit (221), or the second light homogenizing lens (22) has a second scattering microstructure.

4. The pump module according to claim 3, characterized in that: The first lens units (211) are multiple and arranged in an array, and the second lens units (221) are multiple and arranged in an array, and the widths of the first lens units (211) and the second lens units (221) are both 10 micrometers to 999 micrometers.

5. The pump module according to claim 3, characterized in that: The first lens unit (211) and the second lens unit (221) are one of a convex lens, a concave lens, a Fresnel lens, and a honeycomb mirror.

6. The pump module according to claim 3, characterized in that: The first scattering microstructure is a rough surface formed on the first light homogenizing lens (21) by a sandblasting process or a chemical etching process, and the second scattering microstructure is a rough surface formed on the second light homogenizing lens (22) by a sandblasting process or a chemical etching process.

7. The pump module according to claim 3, characterized in that: The first light homogenizing lens (21) is arranged corresponding to the pump source (1); The pump module further comprises a reflector (4), the reflector (4) comprising a plurality of reflectors (41) arranged at intervals along the periphery of the laser gain crystal (3), the reflectors (41) and the first light homogenizing lenses (21) being arranged alternately and surrounding the periphery of the laser gain crystal (3), the reflectors (41) being used to reflect the pump light away from the laser gain crystal (3).

8. The pump module according to claim 7, characterized in that: The second light homogenizing lens (22) surrounds the outer periphery of the laser gain crystal (3), and the reflective element (4) and the first light homogenizing lens (21) arranged alternately surround the outer periphery of the second light homogenizing lens (22).

9. The pump module according to claim 8, characterized in that: The laser gain crystal (3) is rod-shaped, the reflector (4) and the first light homogenizing lens (21) are both arc-shaped plates extending along the axial direction of the laser gain crystal (3) and bent along the circumference of the laser gain crystal (3), and the second light homogenizing lens (22) is tubular and extending along the axial direction of the laser gain crystal (3).

10. The pump module according to claim 8, characterized in that: The space between the second light homogenizing lens (22) and the laser gain crystal (3) is used for the passage of a cooling medium, and the cooling medium is light-transmissive.

11. The pump module according to claim 7, characterized in that: The reflector (4) further comprises a connecting ring (42), the connecting ring (42) surrounds the outer circumference of the laser gain crystal (3), the connecting ring (42) is connected to the same end of at least two of the reflective sheets (41), and the first light homogenizing lens (21) is connected between two adjacent reflective sheets (41); The pump module further comprises a mounting base (5), and the pump source (1), the connecting ring (42), at least one axial end of the second light homogenizing lens (22), and at least one axial end of the laser gain crystal (3) are all connected to the mounting base (5).

12. A laser, characterized in that: include: The pump module according to any one of claims 1 to 11.

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