An end-pumped multi-pass slab laser amplifier

Abstract

The invention relates to the field of solid laser technology, and in particular to an end-pump multi-pass slab laser amplifier, comprising a pump semiconductor laser, a laser shaping optical path, a slab laser crystal, a laser reflection optical path and a heat dissipation module; the heat dissipation module comprises a first temperature sensor, two heat dissipation components, an oscillation component and a gas cooling circulation device, the heat dissipation component comprises a heat sink and an introducer, and the two heat sinks are attached to the slab laser crystal; the structure of each stage of the introducer is divided into two stages and bifurcates step by step to the nth stage; the oscillation component comprises an electromagnetic coil and a magnet respectively arranged on the periphery and inside the bifurcation of the introducer; when the electromagnetic coil drives the magnet to oscillate, the adjacent magnets oscillate in opposite directions; the invention ensures uniform cooling through a plurality of air inlets of the heat sink; combined with the oscillation components with opposite oscillation directions, it is avoided that too many bifurcations lead to poor gas flow, and it is also avoided that the gas has viscosity so as to be unevenly distributed when passing through the bifurcations.

Description

Technical Field

[0001] The invention relates to the technical field of solid lasers, and in particular to an end-pumped multi-pass slab laser amplifier. Background Art

[0002] At present, laser amplifiers can be divided into side pump amplification, end pump amplification, slab amplification and other technologies according to the shape of the gain medium. Side pump amplification and end pump amplification are the most commonly used technologies in laser amplifiers. End pump amplification has the advantages of uniform pumping and good beam quality, in which the pumping direction is the same as the propagation direction of the incident laser. However, due to the use of end pumping, the cross-section of the crystal is small, and the allowable pumping energy is limited, that is, the laser amplification power is limited, and it is mostly used in medium and low power. The pumping light of the side pump amplification technology is perpendicular to the propagation direction of the laser, and the side pumping of the crystal is used. The crystal has a large side area and can load more pumping energy. However, when pumping at high power, heat accumulation in the crystal is likely to cause thermal depolarization, resulting in a decrease in system efficiency. At the same time, the optical efficiency of the side pump module is low, and more pumping energy is required. In addition, the laser crystal is in contact with the focusing cavity and cooling water, and the crystal and the focusing cavity are easily contaminated, which affects the laser power. Therefore, the maintainability of the side pump amplification module is poor. Combining the advantages of the side pump module and the end pump module, the slab amplification technology uses the Zig-zag transmission characteristics of the slab crystal to fully extract the laser gain energy. In particular, the thermal effects of the zigzag propagation Zig-zag slab crystal can offset each other, and the light-to-light conversion efficiency is high, which is particularly suitable for side pumping to output large energy and end pumping to output high beam quality and high power. However, it is still impossible to achieve 100% conversion, and the slab laser crystal still needs to be cooled.

[0003] Patent Publication No. 201911334414.7, in this technical solution, the slab laser crystal dissipates heat by setting a heat sink (heat sink) on the top and / or bottom. Experiments have found that under this technical solution, the internal heat of the slab laser crystal is still insurmountable, and it is also a problem that affects higher power output, especially when two groups of pump semiconductor lasers are used, the heat generation is even greater; and by replacing the heat sink (heat sink) of this technical solution to improve its heat dissipation effect and thus achieve higher power, it is found that: natural cooling (such as cooling fins) is used, but this will result in low heat dissipation efficiency and unable to achieve high power; or active cooling (such as water cooling) is used, but active cooling often has vibration (especially water pumps) and uneven cooling (air cooling has diffusion problems that cause uneven cooling), which causes the laser beam to tremble or the optical path to deviate; therefore, there is a need for an end-pumped multi-pass slab laser amplifier that can achieve better cooling effects while reducing vibration interference and achieving more uniform cooling. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an end-pumped multi-pass slab laser amplifier which can achieve better cooling effect while reducing vibration interference and achieving more uniform cooling.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] An end-pumped multi-pass slab laser amplifier comprises a pump semiconductor laser, a laser shaping optical path, a slab laser crystal, a laser reflection optical path and a heat dissipation module;

[0007] There are two pump semiconductor lasers respectively arranged below the two ends of the slab laser crystal, and there are two groups of laser shaping optical paths respectively arranged between the pump semiconductor laser and the slab laser crystal. The laser generated by the pump semiconductor laser is reflected back to the slab laser crystal through the laser reflection optical path so that the laser beam passes through the slab laser crystal multiple times, and is output from the end face of the slab laser crystal after high gain amplification.

[0008] The slab laser crystal comprises an upper heat dissipation surface and a lower heat dissipation surface;

[0009] The heat dissipation module includes a plurality of first temperature sensors, two heat dissipation components, an oscillating component and a gas cooling circulation device, wherein the plurality of first temperature sensors are evenly distributed on the upper heat dissipation surface and the lower heat dissipation surface; the heat dissipation component includes a heat dissipation body and an introducer, wherein the heat dissipation bodies of the two heat dissipation components are respectively attached to the upper heat dissipation surface and the lower heat dissipation surface; the heat dissipation body is provided with an air outlet and air inlets, n≥3; the introducer includes an air inlet end and an air outlet end, the introducer is vertically arranged upward with the air outlet end facing upward; the air inlet end is bifurcated step by step with a structure that each stage is divided into two, so that the bifurcation of the introducer is the first stage, the second stage until the nth stage, so that the number of air outlet ends is the same as the air inlet; the air inlet end of the introducer is softly connected to the gas cooling circulation device, the air outlet end of the introducer is softly connected to the air inlet, and the air outlet is softly connected to the gas cooling circulation device; the introducer is made of non-magnetic material;

[0010] There are an even number of oscillation components, and the oscillation components include electromagnetic coils and magnets. The electromagnetic coils are sleeved on the outer periphery of the bifurcation of the introducer, and a plurality of the magnets are suspended inside the bifurcation of the introducer and located at the center of the electromagnetic coils. When the end pump multi-pass slat laser amplifier is working, the gas cooling circulation device and all the oscillation components are started. When the electromagnetic coils of the second to nth oscillation components drive the magnets to oscillate during operation, the adjacent magnets of each stage oscillate in opposite directions. The magnets of the first stage of the introducers of the two heat dissipation components oscillate in opposite directions. By avoiding resonance and realizing mutual cancellation of vibrations, the oscillation directions of the magnets, which are an even number in total and half of which are opposite to the oscillation directions of the other half, are used.

[0011] The gas cooling circulation device realizes the circulation of gas and cools the gas.

[0012] Preferably, the upper heat dissipation surface and the lower heat dissipation surface of the slab laser crystal have a plurality of reflection points. If the number of air inlets of the heat sink is greater than or equal to the number of reflection points, an air inlet is arranged corresponding to each reflection point.

[0013] Preferably, the introducer is made of plastic or glass.

[0014] Preferably, the pump semiconductor laser is a semiconductor laser array, and the array structure is an air-cooled vertical stacked array;

[0015] The air-cooled vertical stack is communicated with a gas cooling circulation device.

[0016] Preferably, the gas cooling circulation device comprises a first interface and a second interface, the first interface is softly connected to the gas outlet; the second interface is softly connected to the air-cooled vertical stack array.

[0017] Preferably, the end-pumped multi-pass slab laser amplifier further comprises a controller, and a second temperature sensor is provided on the pump semiconductor laser;

[0018] The first temperature sensor and the second temperature sensor are electrically connected to the controller respectively. The controller controls the outlet temperature of the first interface according to the first temperature sensor, and the controller controls the outlet temperature of the second interface according to the second temperature sensor.

[0019] Preferably, a blocking net is also provided inside the air outlet end of the introducer.

[0020] Preferably, the introducer is formed by splicing multiple Y-shaped channels.

[0021] Preferably, a heat-conducting colloid is provided between the heat sink and the upper heat dissipation surface and the lower heat dissipation surface.

[0022] Preferably, the outer periphery of the gas cooling circulation device is coated with a sound insulation layer, and a shock-absorbing pad is provided at the bottom of the gas cooling circulation device.

[0023] The beneficial effects of the present invention are as follows: by adopting an introducer with a structure that is divided into two stages and bifurcates step by step, the gas can be evenly divided to achieve the first uniform distribution of the gas; then by adopting an oscillation component, cooperating with the introducer to be vertically arranged with the gas outlet facing upward, and combining with the suspended magnet, the magnet is oscillated and swept by the conductive power of the coil, so that the gas passing through when divided into two is more uniform, and the second uniform distribution of the gas is achieved, while ensuring the uniform cooling effect; and by avoiding resonance and achieving mutual cancellation of vibrations by having an even number of magnets and half of the oscillation directions being opposite to the oscillation directions of the other half of the magnets, ensuring the second uniform distribution of the gas while avoiding vibration, ensuring the laser beam effect, and combining with the soft connection, reducing or avoiding the transmission of vibration, and further ensuring the laser beam effect; the present application uses multiple air inlets of the heat sink to make the cooled gas more evenly distributed, ensuring the uniform cooling effect, and then ensuring the uniformity of the crystal temperature; combined with the oscillation component, it is avoided that too much bifurcation causes poor gas flow, and it is also avoided that the gas has viscosity so that the distribution is uneven when passing through the bifurcated distribution, and the flow effect and distribution effect are further guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of an end-pumped multi-pass slab laser amplifier according to a specific embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the principle structure of a heat dissipation module of an end-pumped multi-pass slab laser amplifier according to a specific embodiment of the present invention;

[0026] Explanation of reference numerals: 1. Pump semiconductor laser; 2. Laser shaping optical path; 3. Slab laser crystal; 4. Laser reflection optical path; 5. Heat dissipation module; 51. Heat dissipation assembly; 511. Heat sink; 5111. Air inlet; 5112. Air outlet; 512. Introducer; 513. First stage; 514. Second stage; 515. Third stage; 52. Oscillation assembly; 521. Electromagnetic coil; 522. Magnet; 53. Gas cooling circulation device; 531. First interface; 532. Second interface. DETAILED DESCRIPTION

[0027] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0028] Please refer to Figure 1 as well as Figure 2 , an end-pumped multi-pass slab laser amplifier, comprising a pump semiconductor laser 1, a laser shaping optical path 2, a slab laser crystal 3, a laser reflection optical path 4 and a heat dissipation module 5;

[0029] The pump semiconductor laser 1 has two arranged below the two ends of the slab laser crystal 3, respectively. The laser shaping optical path 2 has two groups, respectively arranged between the pump semiconductor laser 1 and the slab laser crystal 3. The laser generated by the pump semiconductor laser 1 is reflected back to the slab laser crystal 3 through the laser reflection optical path 4, so that the laser beam passes through the slab laser crystal 3 for multiple times, and is output from the end face of the slab laser crystal 3 after high gain amplification.

[0030] The slab laser crystal 3 comprises an upper heat dissipation surface and a lower heat dissipation surface;

[0031] The heat dissipation module 5 includes a plurality of first temperature sensors, two heat dissipation components 51, an oscillating component 52 and a gas cooling circulation device 53. The plurality of first temperature sensors are evenly distributed on the upper heat dissipation surface and the lower heat dissipation surface. The heat dissipation component 51 includes a heat dissipation body 511 and an introducer 512. The heat dissipation bodies 511 of the two heat dissipation components 51 are respectively attached to the upper heat dissipation surface and the lower heat dissipation surface. The heat dissipation body 511 is provided with an air outlet 5112 and There are air inlets 5111, n≥3; the introducer 512 includes an air inlet end and an air outlet end, the introducer 512 is vertically arranged upward with the air outlet end facing upward; the air inlet end is bifurcated step by step with a structure that each stage is divided into two, so that the introducer 512 is bifurcated into a first stage 513, a second stage 514 until the nth stage, so that the number of air outlet ends is the same as the air inlet 5111; the air inlet end of the introducer 512 is softly connected to the gas cooling circulation device 53, the air outlet end of the introducer 512 is softly connected to the air inlet 5111, and the air outlet 5112 is softly connected to the gas cooling circulation device 53; the introducer 512 is made of non-magnetic material;

[0032] There are an even number of oscillation components 52, and the oscillation components 52 include an electromagnetic coil 521 and a magnet 522. The electromagnetic coil 521 is sleeved on the outer periphery of the bifurcation of the introducer 512, and a plurality of the magnets 522 are suspended inside the bifurcation of the introducer 512 and located at the center of the electromagnetic coil 521; when the end pump multi-pass slat laser amplifier is working, the gas cooling circulation device 53 and all the oscillation components 52 are started, and when the electromagnetic coil 521 of the second-stage 514 to the n-th-stage oscillation components 52 drive the magnet 522 to oscillate during operation, the adjacent magnets 522 of each stage oscillate in opposite directions; the magnets 522 of the first stage 513 of the introducers 512 of the two heat dissipation components 51 oscillate in opposite directions; resonance is avoided and vibrations are offset by half of the magnets 522, which have an even number of magnets 522 and whose oscillation directions are opposite to those of the other half of the magnets 522;

[0033] The gas cooling circulation device 53 realizes the circulation of gas and cools the gas.

[0034] As can be seen from the above description, by adopting the structure of bifurcating the introducer 512 in each stage, the gas can be evenly divided to achieve the first uniform distribution of the gas; then, by adopting the oscillating component 52, the introducer 512 is vertically arranged with the gas outlet facing upward, and the magnet 522 is suspended, and the magnet 522 is oscillated and swept by the conductive power of the coil, so that the gas passing through when it is divided into two is more uniform, and the second uniform distribution of the gas is achieved, while ensuring the uniform cooling effect; and by having an even number of magnets 522 and the oscillation direction of half of the magnets 522 being opposite to the oscillation direction of the other half of the magnets 522, the gas can be evenly distributed. Resonance is avoided to achieve mutual cancellation of vibrations, ensuring uniform distribution of the second gas while avoiding vibration, ensuring the laser beam effect, and combined with soft connections, reducing or avoiding the transmission of vibrations, further ensuring the laser beam effect; the present application uses multiple air inlets 5111 of the heat sink 511 to make the cooled gas more evenly distributed, ensuring the uniform cooling effect, and then ensuring the uniformity of the crystal temperature; combined with the oscillation component 52, it avoids excessive bifurcation that causes poor gas flow, and also avoids the viscosity of the gas that makes the distribution uneven when passing through the binary distribution, further ensuring the flow effect and distribution effect.

[0035] Furthermore, the upper and lower heat dissipation surfaces of the slab laser crystal 3 have multiple reflection points. If the number of air inlets 5111 of the heat sink 511 is greater than or equal to the number of reflection points, each reflection point has an air inlet 5111 correspondingly arranged.

[0036] From the above description, it can be seen that an air inlet 5111 is correspondingly arranged at each reflection point to ensure that each radiation point can be cooled in time and the radiation effect is guaranteed.

[0037] Furthermore, the introducer 512 is made of plastic or glass.

[0038] From the above description, it can be seen that the material of the introducer 512 is plastic or glass, which is not easily interfered by the coil, thus avoiding the problem of heating.

[0039] Furthermore, the pump semiconductor laser 1 is a semiconductor laser array, and the array structure is an air-cooled vertical stacked array;

[0040] The air-cooled vertical stack is connected to the air cooling circulation device 53.

[0041] From the above description, it can be seen that the use of an air-cooled vertically stacked pump semiconductor laser 1 can share a gas cooling pump with the slab laser crystal 3, thereby reducing the complexity of the equipment.

[0042] Furthermore, the gas cooling circulation device 53 includes a first interface 531 and a second interface 532 , wherein the first interface 531 is softly connected to the gas outlet 5112 ; and the second interface 532 is softly connected to the air-cooled vertical stack array.

[0043] It can be seen from the above description that the first interface 531 and the second interface 532 are respectively provided to ensure that the gases do not interfere with each other.

[0044] Further, the end-pumped multi-pass slab laser amplifier further comprises a controller, and a second temperature sensor is provided on the pump semiconductor laser 1;

[0045] The first temperature sensor and the second temperature sensor are electrically connected to the controller respectively. The controller controls the outlet temperature of the first interface 531 according to the first temperature sensor, and the controller controls the outlet temperature of the second interface 532 according to the second temperature sensor.

[0046] Furthermore, a blocking net is provided inside the gas outlet end of the introducer 512 .

[0047] It can be seen from the above description that the blocking net is provided to prevent the magnet from falling off and entering the heat sink 511 .

[0048] Furthermore, the introducer 512 is formed by splicing multiple Y-shaped channels.

[0049] It can be seen from the above description that the introducer 512 formed by splicing can be easily maintained and installed.

[0050] Furthermore, a heat-conducting colloid is provided between the heat sink 511 and the upper heat dissipation surface and the lower heat dissipation surface.

[0051] It can be seen from the above description that better heat conduction effect can be achieved through the thermal conductive colloid.

[0052] Furthermore, the outer periphery of the gas cooling circulation device 53 is coated with a sound insulation layer, and a shock-absorbing pad is provided at the bottom of the gas cooling circulation device 53 .

[0053] From the above description, it can be seen that in order to further reduce the impact of vibration and other fluctuations such as sound, sound insulation layers and shock-absorbing pads are used. Example

[0054] An end-pumped multi-pass slab laser amplifier comprises a pump semiconductor laser 1, a laser shaping optical path 2, a slab laser crystal 3, a laser reflection optical path 4 and a heat dissipation module 5;

[0055] The pump semiconductor laser 1 has two arranged below the two ends of the slab laser crystal 3, respectively. The laser shaping optical path 2 has two groups, respectively arranged between the pump semiconductor laser 1 and the slab laser crystal 3. The laser generated by the pump semiconductor laser 1 is reflected back to the slab laser crystal 3 through the laser reflection optical path 4, so that the laser beam passes through the slab laser crystal 3 for multiple times, and is output from the end face of the slab laser crystal 3 after high gain amplification.

[0056] The slab laser crystal 3 comprises an upper heat dissipation surface and a lower heat dissipation surface;

[0057] The heat dissipation module 5 includes a plurality of first temperature sensors, two heat dissipation components 51, an oscillating component 52 and a gas cooling circulation device 53. The plurality of first temperature sensors are evenly distributed on the upper heat dissipation surface and the lower heat dissipation surface. The heat dissipation component 51 includes a heat dissipation body 511 and an introducer 512. The heat dissipation bodies 511 of the two heat dissipation components 51 are respectively attached to the upper heat dissipation surface and the lower heat dissipation surface. The heat dissipation body 511 is provided with an air outlet 5112 and There are air inlets 5111, n=3; the introducer 512 includes an air inlet end and an air outlet end, the introducer 512 is vertically arranged upward with the air outlet end facing upward; the air inlet end is bifurcated step by step with a structure that each stage is divided into two, so that the bifurcation of the introducer 512 is the first stage 513, the second stage 514, and the third stage 515, so that the number of air outlet ends is the same as the air inlet 5111; the air inlet end of the introducer 512 is softly connected to the gas cooling circulation device 53, the air outlet end of the introducer 512 is softly connected to the air inlet 5111, and the air outlet 5112 is softly connected to the gas cooling circulation device 53; the introducer 512 is made of non-magnetic material;

[0058] There are an even number of oscillation components 52, and the oscillation components 52 include an electromagnetic coil 521 and a magnet 522. The electromagnetic coil 521 is sleeved on the outer periphery of the bifurcation of the introducer 512, and a plurality of the magnets 522 are suspended inside the bifurcation of the introducer 512 and located at the center of the electromagnetic coil 521; when the end pump multi-pass slat laser amplifier is working, the gas cooling circulation device 53 and all the oscillation components 52 are started, and when the electromagnetic coil 521 of the second-stage 514 to the n-th-stage oscillation components 52 drive the magnet 522 to oscillate during operation, the adjacent magnets 522 of each stage oscillate in opposite directions; the magnets 522 of the first stage 513 of the introducers 512 of the two heat dissipation components 51 oscillate in opposite directions; resonance is avoided and vibrations are offset by half of the magnets 522, which have an even number of magnets 522 and whose oscillation directions are opposite to those of the other half of the magnets 522;

[0059] The gas cooling circulation device 53 realizes the circulation of gas and cools the gas.

[0060] The upper and lower heat dissipation surfaces of the slab laser crystal 3 have multiple reflection points. If the number of air inlets 5111 of the heat sink 511 is greater than or equal to the number of reflection points, each reflection point has an air inlet 5111 correspondingly arranged.

[0061] The introducer 512 is made of plastic or glass.

[0062] The pump semiconductor laser 1 is a semiconductor laser array, and the array structure is an air-cooled vertical stacked array;

[0063] The air-cooled vertical stack is connected to the air cooling circulation device 53.

[0064] The gas cooling circulation device 53 includes a first interface 531 and a second interface 532 , wherein the first interface 531 is softly connected to the gas outlet 5112 ; and the second interface 532 is softly connected to the air cooling vertical stack array.

[0065] The end-pumped multi-pass slab laser amplifier further comprises a controller, and a second temperature sensor is arranged on the pump semiconductor laser 1;

[0066] The first temperature sensor and the second temperature sensor are electrically connected to the controller respectively. The controller controls the outlet temperature of the first interface 531 according to the first temperature sensor, and the controller controls the outlet temperature of the second interface 532 according to the second temperature sensor.

[0067] A blocking net is also provided inside the gas outlet end of the introducer 512 .

[0068] The introducer 512 is formed by splicing together a plurality of Y-shaped channels.

[0069] There is a heat-conducting colloid between the heat sink 511 and the upper heat dissipation surface and the lower heat dissipation surface.

[0070] The outer periphery of the gas cooling circulation device 53 is covered with a sound insulation layer, and a shock absorbing pad is arranged at the bottom of the gas cooling circulation device 53 . Example

[0071] An end-pumped multi-pass slab laser amplifier comprises a pump semiconductor laser 1, a laser shaping optical path 2, a slab laser crystal 3, a laser reflection optical path 4 and a heat dissipation module 5;

[0072] The pump semiconductor laser 1 has two arranged below the two ends of the slab laser crystal 3, respectively. The laser shaping optical path 2 has two groups, respectively arranged between the pump semiconductor laser 1 and the slab laser crystal 3. The laser generated by the pump semiconductor laser 1 is reflected back to the slab laser crystal 3 through the laser reflection optical path 4, so that the laser beam passes through the slab laser crystal 3 for multiple times, and is output from the end face of the slab laser crystal 3 after high gain amplification.

[0073] The slab laser crystal 3 includes an upper heat dissipation surface and a lower heat dissipation surface;

[0074] The heat dissipation module 5 includes a plurality of first temperature sensors, two heat dissipation components 51, an oscillating component 52 and a gas cooling circulation device 53. The plurality of first temperature sensors are evenly distributed on the upper heat dissipation surface and the lower heat dissipation surface. The heat dissipation component 51 includes a heat dissipation body 511 and an introducer 512. The heat dissipation bodies 511 of the two heat dissipation components 51 are respectively attached to the upper heat dissipation surface and the lower heat dissipation surface. The heat dissipation body 511 is provided with an air outlet 5112 and There are air inlets 5111, n=4; the introducer 512 includes an air inlet end and an air outlet end, the introducer 512 is vertically arranged upward with the air outlet end facing upward; the air inlet end is bifurcated step by step with a structure that each stage is divided into two, so that the bifurcation of the introducer 512 is the first stage 513, the second stage 514, the third stage 515, and the fourth stage, so that the number of air outlet ends is the same as the air inlet 5111; the air inlet end of the introducer 512 is softly connected to the gas cooling circulation device 53, the air outlet end of the introducer 512 is softly connected to the air inlet 5111, and the air outlet 5112 is softly connected to the gas cooling circulation device 53; the introducer 512 is made of non-magnetic material;

[0075] There are an even number of oscillation components 52, and the oscillation components 52 include an electromagnetic coil 521 and a magnet 522. The electromagnetic coil 521 is sleeved on the outer periphery of the bifurcation of the introducer 512, and a plurality of the magnets 522 are suspended inside the bifurcation of the introducer 512 and located at the center of the electromagnetic coil 521; when the end pump multi-pass slat laser amplifier is working, the gas cooling circulation device 53 and all the oscillation components 52 are started, and when the electromagnetic coil 521 of the second-stage 514 to the n-th-stage oscillation components 52 drive the magnet 522 to oscillate during operation, the adjacent magnets 522 of each stage oscillate in opposite directions; the magnets 522 of the first stage 513 of the introducers 512 of the two heat dissipation components 51 oscillate in opposite directions; resonance is avoided and vibrations are offset by half of the magnets 522, which have an even number of magnets 522 and whose oscillation directions are opposite to those of the other half of the magnets 522;

[0076] The gas cooling circulation device 53 realizes the circulation of gas and cools the gas.

[0077] The upper and lower heat dissipation surfaces of the slab laser crystal 3 have multiple reflection points. If the number of air inlets 5111 of the heat sink 511 is greater than or equal to the number of reflection points, each reflection point has an air inlet 5111 correspondingly arranged.

[0078] The introducer 512 is made of plastic or glass.

[0079] The pump semiconductor laser 1 is a semiconductor laser array, and the array structure is an air-cooled vertical stacked array;

[0080] The air-cooled vertical stack is connected to the air cooling circulation device 53.

[0081] The gas cooling circulation device 53 includes a first interface 531 and a second interface 532 , wherein the first interface 531 is softly connected to the gas outlet 5112 ; and the second interface 532 is softly connected to the air cooling vertical stack array.

[0082] The end-pumped multi-pass slab laser amplifier further comprises a controller, and a second temperature sensor is arranged on the pump semiconductor laser 1;

[0083] The first temperature sensor and the second temperature sensor are electrically connected to the controller respectively. The controller controls the outlet temperature of the first interface 531 according to the first temperature sensor, and the controller controls the outlet temperature of the second interface 532 according to the second temperature sensor.

[0084] The introducer 512 is formed by splicing together a plurality of Y-shaped channels.

[0085] There is a heat-conducting colloid between the heat sink 511 and the upper heat dissipation surface and the lower heat dissipation surface.

[0086] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An end-pumped multi-pass slab laser amplifier, characterized in that: It includes a pump semiconductor laser, a laser shaping optical path, a slab laser crystal, a laser reflection optical path and a heat dissipation module; There are two pump semiconductor lasers respectively arranged below the two ends of the slab laser crystal, and there are two groups of laser shaping optical paths respectively arranged between the pump semiconductor laser and the slab laser crystal. The laser generated by the pump semiconductor laser is reflected back to the slab laser crystal through the laser reflection optical path so that the laser beam passes through the slab laser crystal multiple times, and is output from the end face of the slab laser crystal after high gain amplification. The slab laser crystal comprises an upper heat dissipation surface and a lower heat dissipation surface; The heat dissipation module includes a plurality of first temperature sensors, two heat dissipation components, an oscillating component and a gas cooling circulation device, wherein the plurality of first temperature sensors are evenly distributed on the upper heat dissipation surface and the lower heat dissipation surface; the heat dissipation component includes a heat dissipation body and an introducer, wherein the heat dissipation bodies of the two heat dissipation components are respectively attached to the upper heat dissipation surface and the lower heat dissipation surface; the heat dissipation body is provided with an air outlet and air inlets, n≥3; the introducer includes an air inlet end and an air outlet end, the introducer is vertically arranged upward with the air outlet end facing upward; the air inlet end is bifurcated step by step with a structure that each stage is divided into two, so that the bifurcation of the introducer is the first stage, the second stage until the nth stage, so that the number of air outlet ends is the same as the air inlet; the air inlet end of the introducer is softly connected to the gas cooling circulation device, the air outlet end of the introducer is softly connected to the air inlet, and the air outlet is softly connected to the gas cooling circulation device; the introducer is made of non-magnetic material; There are an even number of oscillation components, and the oscillation components include electromagnetic coils and magnets. The electromagnetic coils are sleeved on the outer periphery of the bifurcation of the introducer, and a plurality of the magnets are suspended inside the bifurcation of the introducer and located at the center of the electromagnetic coils. When the end pump multi-pass slat laser amplifier is working, the gas cooling circulation device and all the oscillation components are started. When the electromagnetic coils of the second to nth oscillation components drive the magnets to oscillate during operation, the adjacent magnets of each stage oscillate in opposite directions. The magnets of the first stage of the introducers of the two heat dissipation components oscillate in opposite directions. By avoiding resonance and realizing mutual cancellation of vibrations, the oscillation directions of the magnets, which are an even number in total and half of which are opposite to the oscillation directions of the other half, are used. The gas cooling circulation device realizes the circulation of gas and cools the gas.

2. The end-pumped multi-pass slab laser amplifier according to claim 1, characterized in that: The upper heat dissipation surface and the lower heat dissipation surface of the slab laser crystal have multiple reflection points. If the number of air inlets of the heat sink is greater than or equal to the number of reflection points, each reflection point has an air inlet correspondingly arranged.

3. The end-pumped multi-pass slab laser amplifier according to claim 1, characterized in that: The introducer is made of plastic or glass.

4. The end-pumped multi-pass slab laser amplifier according to claim 1, characterized in that: The pump semiconductor laser is a semiconductor laser array, and the array structure is an air-cooled vertical stacked array; The air-cooled vertical stack is communicated with a gas cooling circulation device.

5. The end-pumped multi-pass slab laser amplifier according to claim 4, characterized in that: The gas cooling circulation device comprises a first interface and a second interface, wherein the first interface is softly connected to the gas outlet; and the second interface is softly connected to the air cooling vertical stack array.

6. The end-pumped multi-pass slab laser amplifier according to claim 5, characterized in that: The end-pumped multi-pass slab laser amplifier further comprises a controller, and a second temperature sensor is provided on the pump semiconductor laser; The first temperature sensor and the second temperature sensor are electrically connected to the controller respectively. The controller controls the outlet temperature of the first interface according to the first temperature sensor, and the controller controls the outlet temperature of the second interface according to the second temperature sensor.

7. The end-pumped multi-pass slab laser amplifier according to claim 1, characterized in that: A blocking net is also arranged in the gas outlet end of the introducer.

8. The end-pumped multi-pass slab laser amplifier according to claim 1, characterized in that: The introducer is formed by splicing multiple Y-shaped channels.

9. The end-pumped multi-pass slab laser amplifier according to claim 1, characterized in that: A heat-conducting colloid is provided between the heat sink and the upper heat-dissipating surface and the lower heat-dissipating surface.

10. The end-pumped multi-pass slab laser amplifier according to claim 1, characterized in that: The outer periphery of the gas cooling circulation device is coated with a sound insulation layer, and a shock-absorbing pad is arranged at the bottom of the gas cooling circulation device.

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