Laser or laser amplifier gain module

Abstract

The application provides a laser gain module for a laser or a laser amplifier, which comprises: gain medium sheets arranged in a spaced stack, and parts of the gain medium sheets are located in gain regions for light to pass through as working parts; the gain medium sheets comprise first gain medium sheets and second gain medium sheets arranged in a space, and the first gain medium sheets and the second gain medium sheets are adjusted to be located in the working parts of the gain regions in different movement modes. The application adopts the arrangement of the gain medium sheets arranged in a spaced stack, and the gain medium sheets have gaps therebetween, so that the flowing air can timely take away the heat on the gain medium sheets. Moreover, the movement modes of the first gain medium sheets and the second gain medium sheets are different, so that the disturbance of the air flow between the first gain medium sheets and the second gain medium sheets can be increased, and the heat dissipation effect of the gain medium sheets is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laser technology, in particular to a laser gain module for a laser or a laser amplifier. BACKGROUND

[0002] Thermal management is an important factor restricting the development of solid-state lasers, especially in high-energy laser systems. The waste heat generated by the gain medium in the solid-state laser limits the power extraction and brightness of the solid-state laser.

[0003] Up to now, the designs of various types of solid-state lasers include: thin disk, large-mode-area fiber, cryogenically cooled gain medium, zigzag end-pumped slab, planar waveguide, master oscillator power amplifier, and heat capacity laser, etc. These methods are the most advanced representatives of thermal management technology in the world's solid-state lasers. These design methods have made great progress, but there are still deficiencies.

[0004] Moving the gain medium in operation is a more effective method of solid-state laser thermal management. The mechanical movement method effectively removes the waste heat generated by the gain medium from the working area for cooling, while moving the cooled gain medium at the same time, so as to reduce the steady-state thermal load in the laser extraction area. Therefore, the use of this technology enables the laser to obtain high-power and high-brightness laser output, so it has a better application prospect.

[0005] The rotating disc technology in the existing moving gain medium method is more ingenious and effective. However, the gain medium used in this method is mostly of an integrated structure. When the crystal disc is thin, the absorption efficiency of the gain medium to the pump light is low. Using a multi-pass pumping structure to improve the absorption of the crystal to the pump light requires a complex pump light control structure, and also increases the thermal load of the crystal. When the thickness of the crystal disc is increased to improve the absorption of the pump light, the temperature gradient inside and outside the working area of the crystal will be large under high power, which also affects the brightness of the output laser. SUMMARY

[0006] The technical problem to be solved by the present application is how to improve the heat dissipation effect of the gain medium of the laser. The present application provides a laser gain module for a laser or a laser amplifier.

[0007] The laser gain module for a laser or a laser amplifier according to the embodiment of the present application comprises: gain medium sheets arranged in a stack with a spacing, part of the gain medium sheets is located in a gain region for light to pass through as a working part, the gain medium sheets comprise first gain medium sheets and second gain medium sheets arranged with a spacing, the first gain medium sheets and the second gain medium sheets are adjusted to be located in the working part of the gain region in different movement modes.

[0008] The laser gain module for laser or laser amplifier according to the embodiments of the present application adopts the gain medium sheet arrangement in the spaced stack arrangement, and the gap is arranged between the gain medium sheets, so that the flowing air can timely take away the heat on the gain medium sheets. Moreover, the movement modes of the first gain medium sheet and the second gain medium sheet are different, so that the disturbance of the air flow between the first gain medium sheet and the second gain medium sheet can be increased, and the heat dissipation effect of the gain medium sheets can be further improved.

[0009] According to some embodiments of the present application, the gain medium sheet is one or more of a ring-shaped sheet, a circular sheet, a polygonal sheet and a polygonal ring sheet.

[0010] In some embodiments of the present application, the movement directions of any adjacent first gain medium sheet and second gain medium sheet are different.

[0011] According to some embodiments of the present application, the movement directions of any adjacent first gain medium sheet and second gain medium sheet are the same and the movement speeds are different.

[0012] In some embodiments of the present application, the doping ion concentration of the gain medium sheet is uniform doping or gradient doping.

[0013] According to some embodiments of the present application, the doping ion concentrations of the gain medium sheets of each sheet are the same; or the doping ion concentrations of part of the gain medium sheets are the same, and the doping ion concentrations of the remaining part of the gain medium sheets are different.

[0014] In some embodiments of the present application, the gain medium sheet is one or more of a whole doping structure, a center doping structure and a surface layer doping structure.

[0015] According to some embodiments of the present application, the gain medium sheet moves linearly or moves in a curve.

[0016] In some embodiments of the present application, the cooling system of the laser gain module adopts air flow cooling or liquid flow cooling.

[0017] According to some embodiments of the present application, the thickness of the gain medium sheet is in the order of millimeter, and the number of the gain medium sheets is not less than 2. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a partial structure schematic diagram of the laser gain module according to the embodiments of the present application;

[0019] Figure 2 It is a partial structure schematic diagram of the laser gain module according to the embodiments of the present application;

[0020] Figure 3A structural schematic diagram of a laser gain module according to an embodiment of the present application.

[0021] Reference signs:

[0022] A laser gain module 100,

[0023] A gain medium wafer 10, a first gain medium sheet 110, a second gain medium sheet 120,

[0024] A base 20, a rotating shaft 210, an outer ring fixing portion 220, a first gasket 231, a second gasket 232, a cooling flow channel h, a first branch h1, a second branch h2,

[0025] A first driving assembly 310, a second driving assembly 320. DETAILED DESCRIPTION

[0026] In order to further clarify the technical means and effects taken by the present application to achieve the predetermined purpose, the present application is described in detail below in combination with the drawings and preferred embodiments.

[0027] As shown in Figures 1-3 Fig. 1, a laser gain module 100 for a laser or a laser amplifier according to an embodiment of the present application comprises: gain medium wafers 10 arranged in a spaced stack, part of the gain medium wafers 10 is located in a gain region for light to pass through as a working part, the gain medium wafers 10 comprise first gain medium sheets 110 and second gain medium sheets 120 arranged in a space, the first gain medium sheets 110 and the second gain medium sheets 120 are adjusted to be located in the working part of the gain region in different movement modes.

[0028] As shown in Figures 1-3 Fig. 2, arrow A indicates the direction of the light path, the region through which arrow A passes is the gain region, and the part of the first gain medium sheets 110 and the second gain medium sheets 120 located in the gain region is the working part. It can be understood that the part of the first gain medium sheets 110 and the second gain medium sheets 120 located in the working part of the gain region will generate a large amount of heat during the operation of the laser, and when the working part moves out of the gain region, it can be cooled.

[0029] It should be noted that the gain medium wafers 10 of the laser gain module 100 are tightly stacked together, and a certain gap is reserved between the sheets. The gap spacing can ensure that the gain medium wafers 10 can work efficiently without being affected, and ensure that the gain medium wafers 10 do not affect each other during movement.

[0030] According to the laser gain module 100 for the laser or the laser amplifier, the gain medium sheets 10 arranged in the spaced stacking manner are arranged, and the gap is arranged between the gain medium sheets 10, so that the flowing air can timely take away the heat on the gain medium sheets 10. Moreover, the movement modes of the first gain medium sheet 110 and the second gain medium sheet 120 are different, so that the disturbance of the air flow between the first gain medium sheet 110 and the second gain medium sheet 120 can be increased, and the heat dissipation effect of the gain medium sheets 10 is further improved.

[0031] According to some embodiments of the present application, the gain medium sheets 10 are one or more of a ring-shaped sheet, a circular sheet, a polygonal sheet and a polygonal ring sheet. That is, the gain medium sheets 10 can be a ring-shaped sheet, a circular sheet, a polygonal sheet or a polygonal ring sheet. Of course, the gain medium sheets 10 can also be different shapes of gain medium sheets composed of the above-mentioned shapes or other shapes. In actual use, the gain medium sheets 10 of corresponding shapes can be designed according to the requirements.

[0032] As shown in Figures 1-3 , the first gain medium sheet 110 and the second gain medium sheet 120 are ring-shaped gain medium sheets. It should be noted that the first gain medium sheet 110 and the second gain medium sheet 120 are ring-shaped sheets with a central hole, which is convenient for the fixation and movement control of the first gain medium sheet 110 and the second gain medium sheet 120, and can improve the heat dissipation effect of the first gain medium sheet 110 and the second gain medium sheet 120.

[0033] In some embodiments of the present application, the movement directions of any adjacent first gain medium sheet 110 and second gain medium sheet 120 are different. It can be understood that when the movement directions of any adjacent first gain medium sheet 110 and second gain medium sheet 120 are different, the air flow disturbance between the first gain medium sheet 110 and the second gain medium sheet 120 is facilitated, and the heat dissipation effect of the gain medium sheets 10 is improved. It should be noted that the present application emphasizes that the movement directions of any adjacent first gain medium sheet 110 and second gain medium sheet 120 are different, and the movement directions of the first gain medium sheet 110 and the second gain medium sheet 120 which are not adjacent can be the same or different.

[0034] According to some embodiments of the present application, the movement direction of any adjacent first gain medium sheet 110 and second gain medium sheet 120 is the same and the movement speed is different. It can be understood that when the movement direction of any adjacent first gain medium sheet 110 and second gain medium sheet 120 is the same but the movement speed is different, the airflow disturbance effect between the first gain medium sheet 110 and the second gain medium sheet 120 can also be improved, thereby improving the heat dissipation effect of the gain medium sheet 10. Similarly, the present application emphasizes that the movement direction of any adjacent first gain medium sheet 110 and second gain medium sheet 120 is the same and the movement speed is different, and the movement speed of the first gain medium sheet 110 and the second gain medium sheet 120 which are not adjacent can be the same or different.

[0035] In some embodiments of the present application, the doping ion concentration of the gain medium sheet 10 is uniformly doped or gradually doped.

[0036] According to some embodiments of the present application, the doping ion concentration of each gain medium sheet 10 is the same; or the doping ion concentration of part of the gain medium sheet 10 is the same, and the doping ion concentration of the remaining part of the gain medium sheet 10 is different.

[0037] For example, the laser gain module 100 can stack gain medium sheets 10 with different doping concentrations according to different requirements, the gain medium sheets 10 in a single-end pumping structure can be arranged with the same doping concentration or arranged with doping concentrations from low to high, the gain medium sheets 10 in a double-end pumping structure can be arranged with the same doping concentration or arranged with doping concentrations from low to high to low, and the gain medium sheets 10 with different doping concentrations can be effectively arranged and stacked according to different conditions.

[0038] In some embodiments of the present application, the gain medium sheet 10 is one or more of a whole doping structure, a center doping structure, and a surface layer doping structure.

[0039] According to some embodiments of the present application, the gain medium sheet 10 moves linearly or curvilinearly.

[0040] For example, the first gain medium sheet 110 and the second gain medium sheet 120 rotate coaxially and in opposite directions. That is, the first gain medium sheet 110 and the second gain medium sheet 120 rotate with the same axis and different directions. For example, the first gain medium sheet 110 can rotate clockwise, and the second gain medium sheet 120 can rotate counterclockwise; or the first gain medium sheet 110 can rotate counterclockwise, and the second gain medium sheet 120 can rotate clockwise. When the first gain medium sheet 110 and the second gain medium sheet 120 rotate, the working part of the first gain medium sheet 110 and the second gain medium sheet 120 located in the gain region can be transformed and adjusted, thereby improving the heat dissipation effect of the first gain medium sheet 110 and the second gain medium sheet 120.

[0041] It should be noted that the rotating mode of the first gain medium sheet 110 and the second gain medium sheet 120 is only an example. The working part located in the gain region can also be adjusted in a linear motion or a curved motion.

[0042] In some embodiments of the present application, the cooling system of the laser gain module 100 adopts air flow cooling or liquid flow cooling.

[0043] According to some embodiments of the present application, the thickness of the gain medium sheet 10 is in the order of millimeters. Of course, the gain medium sheet 10 can also be selected to be thinner or thicker according to the gain medium processing process, hardness and design needs. In some embodiments of the present application, the number of gain medium sheets 10 is not less than 2. That is, the number of gain medium sheets 10 is set to be more than 2. For example, the number of gain medium sheets 10 can be 2, 3, 4, etc. It can be understood that when the number of gain medium sheets 10 is set to be more than 2, different motion modes of the adjacent two gain medium sheets 10 can be used to improve the air flow disturbance, thereby improving the heat dissipation effect of the gain medium sheet 10.

[0044] As shown in Figure 3 According to some embodiments of the present application, the laser gain module 100 further comprises a base 20, the base 20 is provided with a rotating shaft 210 and an outer ring fixing portion 220 extending circumferentially around the rotating shaft 210, the rotating shaft 210 passes through the center holes of the first gain medium sheet 110 and the second gain medium sheet 120, the first gain medium sheet 110 is fixed to the rotating shaft 210, the second gain medium sheet 120 is fixed to the outer ring fixing portion 220, and the first gain medium sheet 110 and the second gain medium sheet 120 rotate coaxially and reversely with the rotating shaft 210 as the axis.

[0045] It should be noted that the rotating shaft 210 and the outer ring fixing portion 220 rotate reversely, for example, when the rotating shaft 210 rotates clockwise, the outer ring fixing portion 220 rotates counterclockwise; when the rotating shaft 210 rotates counterclockwise, the outer ring fixing portion 220 rotates clockwise. Thus, the first gain medium sheet 110 and the second gain medium sheet 120 can be driven to rotate reversely by the rotating shaft 210 and the outer ring fixing portion 220, respectively.

[0046] In some embodiments of the present application, a first gasket 231 is arranged between adjacent first gain medium sheets 110, and the first gasket 231 is fixed to the rotating shaft 210. A second gasket 232 is arranged between adjacent second gain medium sheets 120, and the second gasket 232 is fixed to the outer ring fixing portion 220. As shown in Figure 3As shown, the plurality of first gain medium pieces 110 are sleeved and fixed on the rotating shaft 210, and a first gasket 231 is arranged between two adjacent first gain medium pieces 110. The outer ring part of the plurality of second gain medium pieces 120 is fixed on the outer ring fixing part 220, and a second gasket 232 is arranged between two adjacent second gain medium pieces 120. By arranging the first gasket 231 and the second gasket 232, the positioning and fixing of the first gain medium pieces 110 and the second gain medium pieces 120 can be improved.

[0047] According to some embodiments of the present application, as shown in Figure 3 As shown, the laser gain module 100 further comprises a first driving assembly 310 and a second driving assembly 320.

[0048] The first driving assembly 310 cooperates with the rotating shaft 210 to drive the rotating shaft 210 to rotate the first gain medium pieces 110. For example, the first driving assembly 310 can comprise a driving assembly composed of a motor and a gear, and the motor drives the rotating shaft 210 to rotate the first gain medium pieces 110.

[0049] The second driving assembly 320 cooperates with the outer ring fixing part 220 to drive the outer ring fixing part 220 to rotate the second gain medium pieces 120. For example, the second driving assembly 320 can comprise a driving assembly composed of a motor and a gear, and the motor drives the outer ring fixing part 220 to rotate the second gain medium pieces 120.

[0050] In some embodiments of the present application, as shown in Figure 3 As shown, the base 20 is provided with a cooling flow channel h, and the cooling medium flows through the first gain medium pieces 110 and the second gain medium pieces 120 through the cooling flow channel h. In this way, the first gain medium pieces 110 and the second gain medium pieces 120 can be cooled and cooled by the cooling medium. The cooling medium can be helium or other cooling gas, or in the case of a closed cooling flow channel h, a cooling liquid can be used to cool the first gain medium pieces 110 and the second gain medium pieces 120.

[0051] According to some embodiments of the present application, as shown in Figure 3 As shown, the cooling flow channel h comprises a first branch h1 and a second branch h2, and the cooling medium flows to the gap between the first gain medium pieces 110 and the second gain medium pieces 120 through the first branch h1, and the cooling medium flows vertically to the surface of the first gain medium pieces 110 and the second gain medium pieces 120 through the second branch h2. In this way, sufficient cooling and heat dissipation of the first gain medium pieces 110 and the second gain medium pieces 120 can be achieved, and the heat dissipation effect of the first gain medium pieces 110 and the second gain medium pieces 120 can be improved.

[0052] In some embodiments of the present application, the laser gain module 100 is used as a pump gain module or an amplification gain module of a laser. That is, the laser gain module 100 described above can be used as a pump gain module to generate laser by exciting gain medium with pump light; the laser gain module 100 described above can also be used as an amplification gain module to amplify laser.

[0053] The laser gain module 100 for a laser or a laser amplifier according to the embodiments of the present application can be used in a laser and can also be used in a laser amplifier. For example, the laser gain module 100 can be used in a laser resonant cavity and can also be used as a laser power amplification stage.

[0054] The laser or the laser amplifier according to the embodiments of the present application adopts the first gain medium sheet 110 and the second gain medium sheet 120 arranged in a staggered manner, and in the working process of the laser, the first gain medium sheet 110 and the second gain medium sheet 120 can adjust the working part in the gain region in different directions, so that the parts of the first gain medium sheet 110 and the second gain medium sheet 120 can move or move out of the gain region, and then the heat of the first gain medium sheet 110 and the second gain medium sheet 120 can be diffused in time. Moreover, the movement directions of the first gain medium sheet 110 and the second gain medium sheet 120 are different, thereby the disturbance of the air flow around the first gain medium sheet 110 and the second gain medium sheet 120 can be increased, and thus the heat dissipation effect of the first gain medium sheet 110 and the second gain medium sheet 120 can be further improved.

[0055] The laser gain module 100 for a laser or a laser amplifier according to the present application will be described in detail with reference to the accompanying drawings and a specific embodiment. It should be understood that the following description is only exemplary and should not be construed as a specific limitation of the present application.

[0056] In a solid-state laser using a rotating crystal disc, in order to make the laser gain medium have high efficient absorption of pump light and have good heat management under high pump light power, the present application proposes a new type of solid-state laser gain module, which adopts thin disc close stacking and staggered movement technology.

[0057] As shown in Figure 3 The laser gain module 100 includes: gain medium sheet, rotating system, cooling system, gasket and base 20.

[0058] The gain medium Nd:YAG crystal ring sheet is arranged as 10 pieces, including Figure 3The small circular ring sheet 5 (i.e. the first gain medium sheet 110 described above) and the large circular ring sheet 5 (i.e. the second gain medium sheet 120 described above). The size parameters of the first gain medium sheet 110 are: Φ50X1.2mm, and the inner hole diameter is 20mm; the size parameters of the second gain medium sheet 120 are: Φ60X1.2mm, and the inner hole diameter is 30mm. The thickness of each gain medium sheet is 1.2mm; both sides are coated with a double high-transmission film for pump light 808nm and laser 1064nm;

[0059] The rotating system is fixed on the base 20, including Figure 3 The inner rotating system (i.e. the rotating system composed of the first driving assembly 310 and the rotating shaft 210 described above) and the outer rotating system (i.e. the rotating system composed of the second driving assembly 320 and the outer ring fixing part 220 described above) shown in the figure. The inner and outer rotating systems make the two groups of gain medium sheets coaxial, and the base 20 and the rotating system are precisely machined and made with a precise micro-adjusting structure to ensure that the inner and outer rotating systems are coaxial, and the parallel distance of the platforms on the two rotating shafts 210 is controlled to be on the order of 100 microns.

[0060] The inner and outer rotating systems are driven to rotate by two controllable speed motors respectively, and the rotation of the two motors is adjusted to be exactly opposite to the rotation direction of the two groups of gain medium sheets.

[0061] The first gain medium sheet 110 is fixed on the rotating shaft 210, and the first gasket 231 is arranged between the adjacent two first gain medium sheets 110. The second gain medium sheet 120 is fixed on the outer ring fixing part 220, and the second gasket 232 is arranged between the adjacent two second gain medium sheets 120. The thickness of the gain medium sheet and the gasket is controlled to be on the order of microns by precise machining error, which is used to prevent the problem that the uneven spacing between the adjacent two sheets affects the normal work of the laser after the multiple gain medium sheets are stacked. After the multiple gain medium sheets are stacked, the spacing between the adjacent two gain medium sheets is tight, but it does not affect the efficient work of the gain medium and the movement of the gain medium sheet.

[0062] As shown in Figure 3 The common area along the stacked crystal sheet is the light path of the laser (as shown by arrow A in Figure 1 The base 20 has a suitable light path.

[0063] The gasket is made of aluminum material, including Figure 3The small gasket (i.e. the first gasket 231 described above) and the large gasket (i.e. the second gasket 232 described above) shown in the figure have the following size parameters: the first gasket 231 has an inner diameter of 20 mm, an outer diameter of 30 mm, a thickness of 1.4 mm, a uniform thickness and a high parallelism, and a circle of small holes with a diameter of 0.5 mm in the radial direction, with a spacing of 1 mm between the holes; the second gasket 232 has an inner diameter of 50 mm, an outer diameter of 60 mm, a thickness of 1.4 mm, a uniform thickness and a high parallelism, and a circle of small holes with a diameter of 0.5 mm in the radial direction, with a spacing of 1 mm between the holes.

[0064] The cooling system comprises Figure 3 The cooling flow channel h and the cooling medium in the cooling flow channel h shown in the figure are constituted, wherein the cooling flow channel h comprises a first branch h1 and a second branch h2.

[0065] The base 20 has an inlet for cooling gas, and the cooling gas enters the inlet and is divided into two parts. One part passes through the connecting channel of the rotating shaft 210, spreads in the axial direction from the hollow rotating shaft 210, passes through the axial gap of the rotating shaft 210 and the small holes on the first gasket 231, then passes through the gap between the first gain medium sheet 110 and the second gain medium sheet 120, and finally flows out from the outlet through the small holes on the second gasket 232 of the outer rotating system.

[0066] The cooling gas takes away the heat on the surface of the in-core gain medium sheet when passing through the gap between the first gain medium sheet 110 and the second gain medium sheet 120, thereby cooling the crystal.

[0067] The other part of the cooling gas cools the two outermost surfaces of the first gain medium sheet 110 and the second gain medium sheet 120 through the channels on the base 20.

[0068] In summary, the heat management technology for the gain medium of the solid-state laser is further improved, and the specific improvements are as follows:

[0069] 1. The use of thin gain medium sheets helps to reduce the waste heat generated during the operation of each gain medium sheet. Compared with thick crystals, the temperature difference between the inside and outside of the crystal is smaller under high-power pump light pumping, thereby facilitating the realization of high-power and high-beam-quality laser output.

[0070] 2. The use of the stacking method of multiple thin gain medium sheets improves the effective absorption of pump light by the crystal. Compared with a single thin crystal, multiple-pass absorption is required under high-power pump light pumping, thereby eliminating the complex optical design of multiple-pass reflection of pump light, thereby simplifying the pumping structure while improving the absorption of pump light.

[0071] 3. The use of the stacking method of multiple thin gain medium sheets, and the gaps between the gain medium sheets can be used to circulate cooling gas to dissipate heat from the crystal.

[0072] 4. The airflow between the thin slices is enhanced by the different motion directions of the adjacent gain medium slices, further improving the heat dissipation of the crystal.

[0073] 5. The structure design can be widely applied to laser resonant cavities and laser amplification modules.

[0074] 6. The structure design can be widely applied to crystals outputting different wavelengths, so that more high-power lasers of different wavelengths can be output.

[0075] Through the description of the specific embodiments, the technical means and effects taken by the present application to achieve the predetermined purposes can be more deeply and specifically understood. However, the accompanying drawings are only provided for reference and illustration, and are not used to limit the present application.

Claims

1. A laser gain module for a laser or a laser amplifier, characterized in that: The invention comprises: gain medium slices stacked at intervals, wherein a portion of the gain medium slices is located in a gain region for light to pass through as a working portion, the gain medium slices comprising a first gain medium slice and a second gain medium slice arranged at intervals, and the first gain medium slice and the second gain medium slice adjust the working portion located in the gain region in different motion modes; The movement directions of any adjacent first gain medium slice and the movement directions of any adjacent second gain medium slice are different, or the movement directions of any adjacent first gain medium slice and the movement speeds are the same but different; The gain medium slice moves linearly or curvedly; The laser gain module further includes a base having a rotating shaft and an outer ring fixing portion extending circumferentially around the rotating shaft. The rotating shaft passes through the center holes of the first gain medium sheet and the second gain medium sheet, the first gain medium sheet is fixed to the rotating shaft, and the second gain medium sheet is fixed to the outer ring fixing portion. When the gain medium sheet moves in a curve and the movement directions of any adjacent first gain medium sheet and second gain medium sheet are different, the first gain medium sheet and the second gain medium sheet rotate coaxially in opposite directions about the rotating shaft, and the rotating shaft and the outer ring fixing portion rotate in opposite directions.

2. The laser gain module for a laser or a laser amplifier according to claim 1, characterized in that: The gain medium slice is one or more of an annular slice, a circular slice, a polygonal slice and a polygonal annular slice.

3. The laser gain module for a laser or a laser amplifier according to claim 1, characterized in that: The doping ion concentration of the gain medium slice is uniform doping or gradient doping.

4. The laser gain module for a laser or a laser amplifier according to claim 1, characterized in that: The doping ion concentration of each gain medium slice is the same; or the doping ion concentration of some gain medium slices is the same, and the doping ion concentration of the remaining gain medium slices is different.

5. The laser gain module for a laser or a laser amplifier according to claim 1, characterized in that: The gain medium slice is one or more of an overall doping structure, a central doping structure and a surface doping structure.

6. The laser gain module for a laser or a laser amplifier according to claim 1, characterized in that: The cooling system of the laser gain module adopts air flow cooling or liquid flow cooling.

7. The laser gain module for a laser or a laser amplifier according to any one of claims 1 to 6, characterized in that: The thickness of the gain medium slice is on the order of millimeters, and the number of the gain medium slices is no less than two.

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