Laser crystal fixing structure for staggered pumping

Abstract

The utility model provides a laser crystal fixing structure for staggered pumping. The laser crystal fixing structure comprises a substrate, at least one pair of positioning seats and a laser crystal, the two positioning seats are symmetrically arranged on the top face of the base plate in an integrally-formed mode and arranged in the length extending direction of the base plate in a staggered mode. Wherein a first connecting layer is arranged on one positioning seat, a first connecting groove is defined by the first connecting layer, a second connecting layer is arranged on the other positioning seat, and a second connecting groove corresponding to the first connecting groove is defined by the second connecting layer; and the laser crystal is arranged in the first connecting groove and the second connecting groove. According to the structure, integrated design and machining forming are achieved, the structure is simple, reliable, easy to assemble and suitable for batch production, related technical indexes of the positioning base and the mounting face matched with the laser crystal are effectively guaranteed, and stress-free fixing of the laser crystal and the positioning base is achieved through matching of the connecting layer and a tool.

Description

Technical Field

[0001] The present application relates to the field of lasers, and in particular to a laser crystal fixing structure for staggered pumping. Background Art

[0002] Laser crystal is an important component of solid-state and all-solid-state lasers. In lasers, pump light is highly concentrated in laser crystals. A considerable portion of the pump light absorbed by laser crystals is converted into heat energy and stored inside the crystals, which increases the temperature inside the crystals and causes uneven heat distribution, which can easily cause thermal distortion, thermal stress, and stress birefringence. The thermal effect of laser crystals has a significant impact on all aspects of laser performance, such as output energy, stability of the resonant cavity, output beam quality, etc.; as the pump power increases, the impact of thermal effects becomes more prominent. Therefore, research on the pumping method and fixed heat dissipation structure of laser crystals is also an important part of solving the research on thermal effects of lasers.

[0003] Usually, there are two main pumping modes for diode-pumped solid-state lasers: end pumping and side pumping. End pumping has high coupling efficiency and good mode matching, and can obtain good beam quality. However, due to end pumping, the thermal stress generated on the end face of the laser crystal is large, which limits the increase of pump power. Side pumping is easier to inject high pump power than end pumping, and is more suitable for high-power devices. However, under the side pumping mode, the spatial matching between the pump light and the fundamental mode of the laser resonant cavity is low, the absorption efficiency is low, and the thermal effect of the laser crystal is serious, which affects the performance of the laser. Therefore, the design of the pumping structure of the laser crystal is particularly important.

[0004] The staggered pumping structure can effectively increase the spatial overlap between the pump light and the fundamental mode volume and improve the uniformity of the gain, reduce the influence of thermal effects on the laser mode at higher pump powers, and improve the beam quality of the laser.

[0005] However, when using staggered pumping, the cumulative error caused by the separate processing of the positioning seat and pump module of each laser crystal is too large, which makes the axial error of the laser crystal or the parallelism error between the laser crystals large, making the assembly and debugging more difficult. In addition, the problem of uneven heat dissipation of the crystal due to inconsistent assembly further affects the output performance indicators of the laser, making it unsuitable for batch engineering applications. Utility Model Content

[0006] One of the purposes of the present application is to provide a laser crystal fixing structure for staggered pumping, aiming to solve the problem of increased difficulty in assembly and debugging due to excessive cumulative errors caused by separate processing of positioning seats and pump modules of each laser crystal when using staggered pumping.

[0007] The technical solution of this application is:

[0008] A laser crystal fixing structure for staggered pumping comprises a substrate, at least one pair of positioning seats and a laser crystal; two positioning seats are integrally formed and symmetrically arranged on the top surface of the substrate, and are staggered along the length extension direction of the substrate; one of the positioning seats is provided with a first connection layer, the first connection layer is surrounded by a first connection groove, and the other positioning seat is provided with a second connection layer, the second connection layer is surrounded by a second connection groove corresponding to the first connection groove; the laser crystal is arranged in the first connection groove and the second connection groove.

[0009] As a technical solution of the present application, the connecting surface between the first connecting layer and the laser crystal includes a semi-cylindrical surface, a triangular surface or two axially symmetrical surfaces, and the connecting surface between the second connecting layer and the laser crystal includes a semi-cylindrical surface, a triangular surface or two axially symmetrical surfaces.

[0010] As a technical solution of the present application, the laser crystal includes a round rod-shaped laser crystal, a square plate-shaped laser crystal or two axisymmetric laser crystals.

[0011] As a technical solution of the present application, the laser crystal includes at least one.

[0012] As a technical solution of the present application, the laser crystal includes a Nd:YAG laser crystal or an Er:YAG laser crystal.

[0013] As a technical solution of the present application, the positioning seat includes a positioning block made of tungsten copper, oxygen-free copper or aluminum-based silicon carbide; the first connecting layer parallel to the length direction of the substrate is arranged in the middle of one side surface of one of the positioning blocks, and the upper part of the other opposite side surface has an inclined surface; the second connecting layer parallel to the length direction of the substrate is arranged in the middle of one side surface of the other positioning block, and the upper part of the other opposite side surface has an inclined surface.

[0014] As a technical solution of the present application, the first connection layer and the second connection layer both include a metal welding layer, an adhesive layer or a sticky thermal conductive adhesive pad layer.

[0015] As a technical solution of the present application, the metal welding layer is a metal indium layer or a low melting point metal alloy layer.

[0016] As a technical solution of the present application, the adhesive layer is an ultraviolet adhesive layer, a silver adhesive layer or an epoxy adhesive layer.

[0017] As a technical solution of the present application, the adhesive thermally conductive adhesive pad layer is a T412 thermally conductive double-sided adhesive layer.

[0018] Beneficial effects of this application:

[0019] In the laser crystal fixing structure for staggered pumping of the present application, the structure can be processed and formed in an integrated design according to the requirements of the number and shape of the laser crystals and the number of pump modules, and can be used to fix laser crystals such as solid-state lasers and all-solid-state lasers; at the same time, the structure uses a metal welding layer, an adhesive layer or a sticky thermal conductive adhesive pad layer as a connecting layer, and fixes the side of the laser crystal to a positioning seat that matches its stress through a tooling, thereby preventing displacement and deformation of the laser crystal caused by deformation of the positioning seat, thereby achieving stress-free fixation between the laser crystal and the positioning seat. This structure solves the problem that when using staggered pumping, the accumulated error is too large due to the separate processing of the positioning seat of each laser crystal and the pump module, which makes the axial error of the laser crystal or the parallel error between the laser crystals large, making the assembly and debugging more difficult, and the problem of uneven heat dissipation of the crystal due to inconsistent assembly, which further affects the output performance indicators of the laser and is not suitable for batch engineering applications. Its overall structural form is simple, reliable, easy to assemble and adjust, suitable for batch production, can meet the use of laser crystals in complex environments, ensure the stability of the mechanical and thermal properties of the laser crystals in a wide operating temperature range, meet the use requirements in harsh environments, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of a laser crystal fixing structure for staggered pumping provided in the first embodiment of the present application;

[0022] Figure 2 A schematic diagram of a laser crystal fixing structure for staggered pumping provided in the first embodiment of the present application from a first angle;

[0023] Figure 3 A schematic diagram of a laser crystal fixing structure for staggered pumping provided in the second embodiment of the present application;

[0024] Figure 4 A schematic diagram of a laser crystal fixing structure for staggered pumping provided in a second embodiment of the present application from a first angle;

[0025] Figure 5 A schematic diagram of a laser crystal fixing structure for staggered pumping provided in the third embodiment of the present application;

[0026] Figure 6 A schematic diagram showing a first angle of a laser crystal fixing structure for staggered pumping provided in the third embodiment of the present application.

[0027] Icon: 1-substrate; 2-positioning seat; 3-laser crystal; 4-first connecting layer; 5-second connecting layer. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They 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 should not be understood as a limitation on the present application.

[0032] In addition, in the present application, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] First embodiment:

[0036] Please refer to Figure 1 , with reference Figure 2 The present application provides a laser crystal 3 fixing structure for staggered pumping, comprising a substrate 1, a pair of positioning seats 2 and a laser crystal 3; wherein the two positioning seats 2 are symmetrically arranged on the top surface of the substrate 1 in an integral manner, and are staggered along the length extension direction of the substrate 1; at the same time, a first connecting layer 4 is arranged on one of the positioning seats 2, and the first connecting layer 4 is surrounded by a first connecting groove, and a second connecting layer 5 is arranged on the other positioning seat 2, and the second connecting layer 5 is surrounded by a second connecting groove corresponding to the first connecting groove; and the laser crystal 3 is arranged in the first connecting groove and the second connecting groove, and the positioning seat 2 and the semi-side surface of the laser crystal 3 are fixed as a whole through the first connecting layer 4 and the second connecting layer 5.

[0037] It should be noted that the structure can be adjusted using corresponding tooling according to the number and shape of the laser crystals 3, and can ensure that the positioning seat 2 and the laser crystal 3 are fixed in a stress-free state.

[0038] It should be noted that, in this embodiment, the connection surface between the first connection layer 4 and the laser crystal 3 is a semi-cylindrical surface, and the connection surface between the second connection layer 5 and the laser crystal 3 is a semi-cylindrical surface. In addition, the laser crystal 3 is a round rod-shaped laser crystal 3. Since the laser crystal 3 is an important component of the laser, the round rod-shaped laser crystal 3 can be a Nd:YAG laser crystal 3 or an Er:YAG laser crystal 3 according to the design requirements of the laser. The first connection layer 4 and the second connection layer 5 should both be made of materials with wide temperature stability and good thermal conductivity, and should be adjusted with tooling to ensure that the positioning seat 2 is in full contact with the round rod-shaped laser crystal 3 and is fixed without stress.

[0039] At the same time, the positioning seat 2 adopts a positioning block made of tungsten copper, oxygen-free copper or aluminum-based silicon carbide, and the material of the positioning can be tungsten copper, oxygen-free copper, aluminum-based silicon carbide and other metal materials; a first connection layer 4 parallel to the length direction of the substrate 1 is arranged in the middle of one side of one positioning block, and the upper part of the other opposite side has an inclined surface; and a second connection layer 5 parallel to the length direction of the substrate 1 is arranged in the middle of one side of another positioning block, and the upper part of the other opposite side has an inclined surface. According to the requirements of the first connection layer 4 and the second connection layer 5, the connection surface on the positioning seat 2 can be roughened or polished and gold-plated, and the expansion coefficient of the positioning seat 2 should match the material of the round rod-shaped laser crystal 3. In addition, the number of interleaved pumping groups is determined according to the design requirements of the interleaved pumping method, and the positioning seat 2 can be one pair or more pairs.

[0040] It should be noted that in this embodiment, the positioning seat 2 is fixed to the round rod-shaped laser crystal 3 through the first connecting layer 4 and the second connecting layer 5. The first connecting layer 4 and the second connecting layer 5 should be made of materials with wide temperature stability and good thermal conductivity, and the tooling adjustment is supplemented to ensure that the positioning seat 2 and the round rod-shaped laser crystal 3 are fully in contact and fixed without stress. The first connecting layer 4 and the second connecting layer 5 can both be made of metal welding layers, adhesive layers, or adhesive thermal conductive adhesive pad layers.

[0041] Specifically, when the first connection layer 4 and the second connection layer 5 are both made of metal welding materials, the connection surface between the positioning seat 2 and the laser crystal 3 is polished and gold-plated, and a metal solder that is stable in a wide temperature range is selected, and the tooling is adjusted to ensure that the connection surface between the positioning seat 2 and the laser crystal 3 is fully in contact and stress-free; and if the first connection layer 4 and the second connection layer 5 are both made of metal welding layers, the metal welding layers can be metal indium layers or low-melting-point metal alloy layers. When the first connection layer 4 and the second connection layer 5 are connected by adhesives, there are no requirements for the connection surface between the positioning seat 2 and the laser crystal 3. An adhesive that is stable in a wide temperature range and has good thermal conductivity should be selected, and the tooling is adjusted to ensure that the connection surface between the positioning seat 2 and the laser crystal 3 is fully in contact and stress-free; and if the first connection layer 4 and the second connection layer 5 are both made of adhesive layers, the adhesive layers can be adhesive layers such as ultraviolet adhesive layers, silver adhesive layers or epoxy adhesive layers. When the first connection layer 4 and the second connection layer 5 use sticky thermal conductive adhesive pads, there is no requirement for the connection surface between the positioning seat 2 and the laser crystal 3. A sticky thermal conductive adhesive pad that is stable in a wide temperature range and has good thermal conductivity should be selected, and tooling adjustment should be used to ensure that the connection surface between the positioning seat 2 and the laser crystal 3 is in full contact and stress-free; and, if the first connection layer 4 and the second connection layer 5 both use thermal conductive adhesive pad layers, then the thermal conductive adhesive pad layers can be T412 thermal conductive double-sided adhesive layers, etc.

[0042] In summary, in the laser crystal 3 fixing structure for staggered pumping of the present application, the structure can realize integrated design processing and molding according to the requirements of the number and shape of the laser crystals 3 and the number of pump modules; at the same time, the structure adopts a metal welding layer, an adhesive layer or a sticky thermal conductive adhesive pad layer as a connecting layer, and fixes the side of the laser crystal 3 to the positioning seat 2 whose stress matches the laser crystal 3 through a tooling, thereby preventing the displacement and deformation of the laser crystal 3 caused by the deformation of the positioning seat 2, and realizing stress-free fixation between the laser crystal 3 and the positioning seat 2. This structure solves the problem that when using staggered pumping, the accumulated error is too large due to the separate processing of the positioning seat 2 of each laser crystal 3 and the pump module, which makes the axial error of the laser crystal 3 or the parallelism difference between the laser crystals 3 large, making the assembly and debugging more difficult, and the problem of uneven heat dissipation of the crystal due to inconsistent assembly, which further affects the output performance indicators of the laser and is not suitable for batch engineering applications. The overall structure is simple, reliable, easy to assemble and adjust, suitable for batch production, can meet the use of laser crystals 3 in complex environments, ensure the stability of the mechanical and thermal properties of the laser crystals 3 in a wide operating temperature range, meet the use requirements in harsh environments, and have a wide range of applications.

[0043] Second embodiment:

[0044] Please refer to Figure 3 , with reference Figure 4 The present application provides a laser crystal 3 fixing structure for staggered pumping, which is substantially the same as the structure in the first embodiment, except that the shape of the laser crystal 3 is different.

[0045] In this embodiment, the laser crystal 3 is a square plate-shaped laser crystal 3. The connection surface between the first connection layer 4 and the laser crystal 3 is a triangular surface, and the connection surface between the second connection layer 5 and the laser crystal 3 is a triangular surface. According to the requirements of the first connection layer 4 and the second connection layer 5, the connection surface of the positioning seat 2 can be roughened or polished and gold-plated. The material of the positioning seat 2 can be tungsten copper, oxygen-free copper, aluminum-based silicon carbide and other metal materials, and its expansion coefficient should match the material of the square plate-shaped laser crystal 3.

[0046] The positioning seat 2 can determine the number of interleaved pumping groups according to the design requirements of the interleaved pumping method, which can be one pair or more pairs; the laser crystal 3 is an important component of the laser. According to the design requirements of the laser, the square slab-shaped laser crystal 3 can be Nd:YAG, Er:YAG or other laser crystals 3.

[0047] The positioning seat 2 is fixed to the square plate-shaped laser crystal 3 through the first connection layer 4 and the second connection layer 5. The first connection layer 4 and the second connection layer 5 should be made of materials with wide temperature stability and good thermal conductivity, and the tooling should be used to ensure that the positioning seat 2 and the square plate-shaped laser crystal 3 are fully in contact and fixed without stress. The first connection layer 4 and the second connection layer 5 can be made of metal welding materials, adhesives, or viscous thermal conductive pads.

[0048] If the positioning seat 2 is fixed to the square plate-shaped laser crystal 3 through a metal welding material connecting layer, the connecting surface between the positioning seat 2 and the square plate-shaped laser crystal 3 is polished and gold-plated, and the first connecting layer 4 and the second connecting layer 5 should be made of metal welding materials with wide temperature stability and good thermal conductivity, and assisted by tooling adjustment to ensure that the positioning seat 2 and the square plate-shaped laser crystal 3 are fully in contact and stress-free. In addition, the metal welding material can be metal indium, low-melting point metal alloys and other metal welding materials.

[0049] If the positioning seat 2 is fixed to the square plate-shaped laser crystal 3 through an adhesive connecting layer, there is no requirement for the connecting surface between the positioning seat 2 and the laser crystal 3. The first connecting layer 4 and the second connecting layer 5 should select an adhesive that is stable within a wide temperature range and has good thermal conductivity, and is assisted by tooling adjustment to ensure that the connecting surface between the positioning seat 2 and the square plate-shaped laser crystal 3 is in full contact and fixed without stress; and the adhesive can be ultraviolet glue, silver glue, epoxy glue, etc.

[0050] If the positioning seat 2 is fixed to the square plate-shaped laser crystal 3 through a sticky thermal conductive adhesive pad connecting layer, and the first connecting layer 4 and the second connecting layer 5 use sticky thermal conductive adhesive pads, there is no requirement for the connection surface between the positioning seat 2 and the square plate-shaped laser crystal 3. The first connecting layer 4 and the second connecting layer 5 should choose a sticky thermal conductive adhesive pad that is stable and has good thermal conductivity within a wide temperature range, and should be assisted by tooling adjustment to ensure that the connection surface between the positioning seat 2 and the square plate-shaped crystal is in full contact and fixed without stress; and the sticky thermal conductive adhesive pad can be a thermal conductive double-sided adhesive such as T412.

[0051] Third embodiment:

[0052] Please refer to Figure 5 , with reference Figure 6 The present application provides a laser crystal 3 fixing structure for staggered pumping, which is substantially the same as the structure in the first embodiment, except that the number of laser crystals 3 is different.

[0053] In this embodiment, there are two laser crystals 3. The connection surface between the first connection layer 4 and the laser crystal 3 and the connection surface between the second connection layer 5 and the laser crystal 3 are axisymmetric surfaces.

[0054] Furthermore, in this embodiment, the connection surface between the positioning seat 2 and the round rod-shaped laser crystal 3 is designed as a semi-cylindrical surface, and the connection surface of the positioning seat 2 can be roughened or polished and gold-plated according to the requirements of the first connection layer 4 and the second connection layer 5. The material of the positioning seat 2 can be a metal material such as tungsten copper, oxygen-free copper, aluminum-based silicon carbide, etc., and its expansion coefficient should match the material of the round rod-shaped laser crystal 3.

[0055] The positioning seat 2 is a plurality of symmetrically positioned integrated positioning seats 2. The number of interleaved pumping groups can be determined according to the design requirements of the interleaved pumping method, which can be one pair or more pairs; the number of laser crystals 3 connected in series can also be determined.

[0056] The laser crystal 3 is an important component of the laser. According to the design requirements of the laser, the round rod-shaped laser crystal 3 can be Nd:YAG, Er:YAG or other laser crystals 3.

[0057] The positioning seat 2 is fixed to the round rod-shaped laser crystal 3 through the connecting layer. The first connecting layer 4 and the second connecting layer 5 should be made of materials with wide temperature stability and good thermal conductivity. The tooling is used to ensure that the positioning seat 2 is in full contact with the round rod-shaped laser crystal 3, and the tooling is used to ensure the alignment between the two round rod-shaped laser crystals 3 and the plane parallelism of the end faces, and should be fixed to the positioning seat 2 without stress. The first connecting layer 4 and the second connecting layer 5 can be made of metal welding materials, adhesives, or adhesive thermal conductive pads.

[0058] If the positioning seat 2 is fixed to the round rod-shaped laser crystal 3 through a metal welding material connection layer, the connection surface between the positioning seat 2 and the laser crystal 3 is polished and gold-plated, and the first connection layer 4 and the second connection layer 5 should be made of metal welding materials with wide temperature stability and good thermal conductivity. The tooling is used to ensure that the positioning seat 2 is in full contact with the round rod-shaped laser crystal 3, and the tooling is used to ensure the alignment between the two round rod-shaped laser crystals 3 and the plane parallelism of the end faces, and the positioning seat 2 should be fixed without stress. In addition, the metal welding material can be metal indium, low melting point metal alloy and other metal welding materials.

[0059] If the positioning seat 2 is fixed to the round rod-shaped laser crystal 3 through an adhesive connection layer, the connection surface between the positioning seat 2 and the laser crystal 3 is not required, and the first connection layer 4 and the second connection layer 5 should be selected from adhesives that are stable in a wide temperature range and have good thermal conductivity, and with the aid of tooling adjustment, ensure that the positioning seat 2 is in full contact with the round rod-shaped laser crystal 3, and that the two round rod-shaped laser crystals 3 are aligned and the plane parallelism of the end faces, and should be fixed to the positioning seat 2 without stress. In addition, the adhesive can be an adhesive such as ultraviolet glue, silver glue, epoxy glue, etc.

[0060] If the positioning seat 2 is fixed to the round rod-shaped laser crystal 3 through a viscous thermal conductive adhesive pad connection layer, when the first connection layer 4 and the second connection layer 5 use a viscous thermal conductive adhesive pad, there is no requirement for the connection surface between the positioning seat 2 and the laser crystal 3. The first connection layer 4 and the second connection layer 5 should be a viscous thermal conductive adhesive pad that is stable in a wide temperature range and has good thermal conductivity, and with the aid of tooling adjustment, ensure the full contact between the positioning seat 2 and the round rod-shaped laser crystal 3, the alignment between the two round rod-shaped laser crystals 3, the plane parallelism of the end faces, and should be fixed to the positioning seat 2 without stress. In addition, the viscous thermal conductive adhesive pad can be a thermal conductive double-sided adhesive such as T412.

[0061] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A laser crystal fixing structure for staggered pumping, characterized in that: It includes a substrate, at least one pair of positioning seats and a laser crystal; the two positioning seats are integrally formed and symmetrically arranged on the top surface of the substrate, and are staggered along the length extension direction of the substrate; one of the positioning seats is provided with a first connecting layer, and the first connecting layer is surrounded by a first connecting groove, and the other positioning seat is provided with a second connecting layer, and the second connecting layer is surrounded by a second connecting groove corresponding to the first connecting groove; the laser crystal is arranged in the first connecting groove and the second connecting groove.

2. The laser crystal fixing structure for staggered pumping according to claim 1, characterized in that: The connection surface between the first connection layer and the laser crystal includes a semi-cylindrical surface, a triangular surface or two axially symmetrical surfaces, and the connection surface between the second connection layer and the laser crystal includes a semi-cylindrical surface, a triangular surface or two axially symmetrical surfaces.

3. The laser crystal fixing structure for staggered pumping according to claim 1, characterized in that: The laser crystal includes a round rod-shaped laser crystal, a square plate-shaped laser crystal or two axisymmetric laser crystals.

4. The laser crystal fixing structure for staggered pumping according to claim 1, characterized in that: The laser crystal comprises at least one.

5. The laser crystal fixing structure for staggered pumping according to claim 1, characterized in that: The laser crystal includes a Nd:YAG laser crystal or an Er:YAG laser crystal.

6. The laser crystal fixing structure for staggered pumping according to claim 1, characterized in that: The positioning seat includes a positioning block made of tungsten copper, oxygen-free copper or aluminum-based silicon carbide; the first connection layer is arranged in parallel with the length direction of the substrate in the middle of one side surface of one of the positioning blocks, and the upper part of the other opposite side surface has an inclined surface; the second connection layer is arranged in parallel with the length direction of the substrate in the middle of one side surface of the other positioning block, and the upper part of the other opposite side surface has an inclined surface.

7. The laser crystal fixing structure for staggered pumping according to claim 1, characterized in that: The first connection layer and the second connection layer both include a metal welding layer, an adhesive layer or an adhesive thermal conductive adhesive pad layer.

8. The laser crystal fixing structure for staggered pumping according to claim 7, characterized in that: The metal welding layer is a metal indium layer or a low melting point metal alloy layer.

9. The laser crystal fixing structure for staggered pumping according to claim 7, characterized in that: The adhesive layer is an ultraviolet adhesive layer, a silver adhesive layer or an epoxy adhesive layer.

10. The laser crystal fixing structure for staggered pumping according to claim 7, characterized in that: The adhesive thermal conductive adhesive pad layer is a T412 thermal conductive double-sided adhesive layer.

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