Double-end pumping slab laser amplifier based on temperature control

Abstract

The double-end pumping slab laser amplifier comprises end face pumping laser modules arranged at the two ends of a slab heat sink module respectively, and the end face pumping laser modules and the slab heat sink module are both connected with a temperature detection assembly and a temperature control assembly. The temperature detection assembly comprises a first temperature probe used for monitoring the temperature of the end face pumping laser module, a second temperature probe used for monitoring the side face of the lath gain medium, and a third temperature probe used for monitoring the top face of the lath gain medium. The temperature control assembly comprises a first water cooling device and a fourth water cooling device which are used for adjusting the temperature of the end face pumping laser module, and further comprises a second water cooling device and a third water cooling device which are used for adjusting the temperature of the lath heat sink module. And the slab gain medium fully absorbs the pump light, so that the damage risk caused by escape of the pump light is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of high-power solid-state lasers, in particular to a double-end pumped slab laser amplifier based on temperature control. Background Art

[0002] High-repetition-rate, high-energy, short-pulse lasers have broad application prospects in laser processing, laser ignition, and optoelectronic countermeasures. Short-cavity Q-switching, also known as Q-switching, is a short-period laser generation technique. It compresses the energy of a conventional continuous laser into extremely narrow pulses for emission, thereby increasing the peak power of the source by several orders of magnitude. However, the small mode volume in a short laser cavity limits the increase in pulse energy.

[0003] The combination of short-cavity Q-switching technology and master oscillator power amplifier (MOPA) technology can further enhance the output energy of short-pulse lasers. For MOPA technology, the thermal lensing effect of the gain module is unavoidable, which reduces the beam quality of the laser output and even damages the optical components. The gain medium in a slab laser amplifier is characterized by a generally large width-to-thickness ratio, and heat is dissipated through two large side surfaces. Compared with rod lasers, the slab gain medium has a larger heat dissipation area, accelerates heat dissipation in the thickness direction, and cleverly simplifies the two-dimensional thermal effect into a one-dimensional thermal effect, which greatly suppresses the thermal effect of the slab gain medium, reduces the birefringence effect, and facilitates thermal management.

[0004] Therefore, slab laser amplifiers have become one of the most effective approaches for achieving high-power, high-beam-quality laser output. However, slab laser amplifiers have not yet achieved kilohertz-joule-level, sub-nanosecond laser output. One reason for this is the difficulty in further increasing the pump power. Consequently, double-ended pumping technology has emerged to further increase the pump power. However, during double-ended pumping, the pump light is not fully absorbed by the gain medium, and residual pump light can pass through the gain medium into the pump module at the other end, damaging it. To isolate this residual pump light, an isolation system is added, increasing system complexity and production costs. Increasing the pump power also reduces the uniformity of the slab's thermal distribution and the stability of the pump wavelength. Therefore, current technologies struggle to achieve nearly 10,000-watt, double-ended pumped, tunable, high-energy, high-power laser output.

[0005] It should be noted that the above technical information is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or implication in any form that the above technical information constitutes prior art already known to those skilled in the art. Summary of the Invention

[0006] In response to the deficiencies in the above-mentioned background technology, the present invention proposes a temperature-controlled double-end pumped slab laser amplifier, which solves the problem that the current existing technology is difficult to achieve nearly 10,000 watt double-end pumped tunable high-energy and high-power laser output.

[0007] The technical solution of this application is: A temperature-controlled double-ended pumped slab laser amplifier includes end-pumped laser modules, respectively disposed at both ends of a slab heat sink module. Pump light is introduced from the end-pumped laser modules into a slab gain medium in the slab heat sink module. Laser light is introduced into the slab gain medium from either end face of the slab gain medium. The end-pumped laser modules and the slab heat sink module are both connected to a temperature detection assembly and a temperature control assembly. The temperature detection assembly includes a first temperature probe for monitoring the temperature of the end-pumped laser module, a second temperature probe for monitoring the side surfaces of the slab gain medium, and a third temperature probe for monitoring the top surface of the slab gain medium. The temperature control assembly includes a first water cooling device and a fourth water cooling device for regulating the temperature of the end-pumped laser module, and also includes a second water cooling device and a third water cooling device for regulating the temperature of the slab heat sink module.

[0008] Furthermore, a pump light source component is provided in the housing, and pump light is emitted from the pump light source component, passes through a pump shaping lens group, and is introduced into the slab heat sink module through a waveguide.

[0009] Furthermore, the pump shaping lens group includes a cylindrical convex lens 1, a cylindrical convex lens 2, and a cylindrical concave lens, which are arranged in sequence along the optical path of the pump light. The cylindrical convex lens 1, the cylindrical convex lens 2, and the cylindrical concave lens are all movably connected to the shell. The central axis of the curved surface of the cylindrical convex lens 1 is arranged in the vertical direction, and the central axes of the curved surfaces of the cylindrical convex lens 2 and the cylindrical concave lens are both arranged in the horizontal direction.

[0010] Furthermore, the water cooling device 4 includes a terminal water cooling plate connected to the pump light source component and a front end water cooling plate arranged between the pump shaping lens group and the waveguide, and the terminal water cooling plate and the front end water cooling plate are both connected to the shell.

[0011] Furthermore, the pump light source component includes a connected laser diode guide component and a laser diode array component. A temperature probe is provided in the laser diode array component, and the temperature probe is connected to a control system of a water cooling device.

[0012] Furthermore, the slat heat sink module includes a slat gain medium, heat sink microchannels are provided on both sides of the slat gain medium, heat sink guide blocks are provided on the outside of the heat sink microchannels, and the heat sink guide blocks are respectively provided with two heat sink water inlets and one heat sink water outlet along the length direction of the slat gain medium, and the heat sink water outlet is provided between the two heat sink water inlets.

[0013] Furthermore, a groove is provided on the contact surface between the heat sink microchannel and the slab gain medium, and the second temperature probe is provided in the groove. The second temperature probe is connected to the second control system of the second water cooling device.

[0014] Furthermore, the slab gain medium adopts a YAG+NG:YAG+YAG bonded crystal, and both ends of the slab gain medium are respectively set as inclined surfaces, and the laser is introduced into the slab gain medium from the inclined surface at either end.

[0015] Furthermore, the waveguide is connected to a side surface of the slab gain medium, and the pump light is introduced from the side surface of the slab gain medium into the side surface of the slab gain medium.

[0016] Furthermore, the top and bottom of the slat heat sink module are both provided with a cover plate assembly, and the cover plate assembly includes an upper cover plate and a lower cover plate that are detachably connected to the heat sink guide block respectively, and the upper cover plate is provided with a strip hole for the temperature detection assembly to slide, and the lower cover plate is connected to the fixed base.

[0017] Furthermore, the temperature detection component includes a slider that slides with the through hole, and the slider is connected to a fixing groove for clamping the temperature probe three. The temperature probe three contacts the top surface of the slab gain medium, and the temperature probe three is connected to the control system three of the water cooling device three.

[0018] The specific beneficial effects of the present invention include: 1. The present invention relates to two end-pumped laser modules. When pump light is introduced into a slab gain medium from two side surfaces thereof, the escaping pump light can easily enter the end-pumped laser module when output from the side surfaces of the slab gain medium, causing irreversible damage to its internal components. To reduce the risk of damage, it is necessary to ensure that the pump light is absorbed as fully as possible. However, the peak wavelength of the output pump light easily varies with the cooling temperature. Therefore, the peak wavelength of the pump light is dynamically regulated by dynamically controlling the pump cooling temperature, so that the slab gain medium fully absorbs the pump light, thereby reducing the risk of damage from the escaping pump light. 2. The present invention has a compact structure, simplifies optical components, and reduces costs; 3. The present invention significantly reduces the power of escaping pump light by controlling the cooling temperature of the pump light, thereby achieving lossless amplification of double-ended pumping without isolation. 4. The present invention can achieve kilohertz, hundred-picosecond, joule-level laser output with high beam quality; 5. The present invention dynamically adjusts the temperature distribution of the slats through real-time temperature monitoring to improve the quality of the laser beam; 6. The present invention controls the cooling of the end-face pumped laser module by temperature control, thereby extending the life of the laser diode array component and improving the absorption efficiency of the slab gain medium to the pump light. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0020] Figure 1 is a schematic diagram of the present invention; Figure 2 This is a cross-sectional view of the end-pumped laser module; Figure 3 is a schematic diagram of a slat heat sink module; Figure 4 is a schematic diagram of the slab gain medium; Figure 5 is a schematic diagram of a cover assembly; Figure 6 Schematic diagram of the temperature detection component in the cover assembly.

[0021] Description of Figure Numbers: 1. End-pump laser module; 2. Cover plate assembly; 3. Slat heat sink module; 4. Fixed base; 1-1, terminal water cooling plate; 1-2, front end water cooling plate; 1-3, waveguide; 1-4, laser diode guide assembly; 1-5, laser diode array assembly; 1-6, pump shaping lens assembly; 2-1, upper cover; 2-2, heat sink fixing hole; 2-3, strip hole; 2-4, slider; 2-5, Slider slot; 3-1. Heat sink water inlet; 3-2. Heat sink water outlet; 3-3, heat sink microchannel; 3-4, slab gain medium; 3-5, groove; 3-6, heat sink guide block; 3-7, inclined surface; 2-4-1, slider plate; 2-4-2, threaded column; 2-4-3, temperature probe fixing plate; 2-4-4, top screw thread hole; 2-4-5, fixed slot. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the core concept of the present invention and the following embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The present application provides these embodiments to make this application thorough and complete, and to fully express the scope of this application to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as merely exemplary, and not as limiting.

[0024] It should be noted that, in the description of this application, unless otherwise specified, "several" means greater than or equal to two; the terms "upper," "lower," "left," "right," "inner," "outer," "axial," "radial," and the like, indicating orientations or positional relationships, are intended solely to facilitate the description of this application and simplify the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0025] In addition, the terms "first," "second," and similar terms used in this application do not denote any order, quantity, or importance, but are simply used to distinguish different parts. "Perpendicular" does not mean perpendicular in the strict sense, but rather means within the tolerance range. "Parallel" does not mean parallel in the strict sense, but rather means within the tolerance range. "Include" or "comprising" and similar terms mean that the elements preceding the word include the elements listed after the word, and do not exclude the possibility of other elements being included.

[0026] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "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 internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0027] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0028] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the corresponding technologies, methods, and equipment should be considered part of the specification.

[0029] A temperature-controlled double-ended pumped slab laser amplifier, such as Figure 1As shown, it includes end-pump laser modules 1 respectively arranged at both ends of the slab heat sink module 3. Pump light is introduced from the end-pump laser module 1 into the slab gain medium 3-4 in the slab heat sink module 3. Laser light is introduced into the slab gain medium 3-4 from any end face of the slab gain medium 3-4. The end-pump laser module 1 and the slab heat sink module 3 are both connected to a temperature detection component and a temperature control component. The temperature detection component includes a temperature probe 1 for monitoring the temperature of the end-pump laser module 1, a temperature probe 2 for monitoring the side surface of the slab gain medium 3-4, and a temperature probe 3 for monitoring the top surface of the slab gain medium 3-4. The temperature control component includes a water cooling device 1 and a water cooling device 4 for adjusting the temperature of the end-pump laser module 1, and also includes a water cooling device 2 and a water cooling device 3 for adjusting the temperature of the slab heat sink module 3. The present invention relates to two end-pumped laser modules. When pump light is introduced into a slab gain medium from two side surfaces thereof, escaping pump light is easily introduced into the end-pumped laser module when output from the side surfaces of the slab gain medium, causing irreversible damage to internal components. To reduce the risk of damage, it is necessary to ensure that the pump light is absorbed as fully as possible. However, the peak wavelength of the output pump light is easily affected by the cooling temperature. Therefore, the peak wavelength of the pump light can be dynamically regulated by dynamically controlling the pump cooling temperature, so that the slab gain medium fully absorbs the pump light, thereby reducing the risk of damage caused by the escaping pump light. The present invention greatly reduces the power of the escaping pump light by controlling the cooling temperature of the pump light, thereby achieving lossless amplification of double-end pumping without isolation. The present invention can realize kilohertz, hundred-picosecond, joule-level laser output with high beam quality. The present invention dynamically adjusts the slab temperature distribution through real-time temperature monitoring, thereby improving the laser beam quality.

[0030] Specifically, the pump light output by the end-pump laser module 1 is directed into the side input window of the slab gain medium 3-4 of the slab heat sink module 3. The light is then reflected from the end face of the slab gain medium 3-4 and enters the interior of the gain medium. The laser light is incident through the end face of the slab gain medium 3-4, transmitting in a zigzag pattern. The laser light continuously absorbs the pump light energy, achieving the purpose of laser amplification. As the slab gain medium 3-4 continuously absorbs the pump light, a large amount of waste heat accumulates. Uneven heat dissipation from the crystal can lead to a decrease in laser beam quality. To ensure uniform heat dissipation from the crystal, temperature detection assemblies are installed in different areas. Each temperature detection assembly is equipped with a water cooling device to ensure uniform temperature distribution of the slab gain medium 3-4 when pumping at different pump powers. Each water cooling device is independent of the other.

[0031] The present invention relates to two end-pumped laser modules 1. When pump light is introduced into the slab gain medium 3-4 from two side surfaces thereof, escaped pump light (the unabsorbed portion of the pump light) can easily enter the end-pumped laser module 1 when it is output from the side surfaces of the slab gain medium 3-4, causing irreversible damage to its internal components. To reduce the risk of damage, it is necessary to ensure that the pump light is absorbed as fully as possible. Since the peak wavelength of the output pump light easily varies with the cooling temperature, the peak wavelength of the pump light can be dynamically controlled by dynamically controlling the pump cooling temperature, ensuring that the slab gain medium 3-4 fully absorbs the pump light, thereby reducing the risk of damage from the escaped pump light.

[0032] On the basis of the above embodiment, as a preferred embodiment, Figure 2 As shown, a pump light source assembly is disposed within the housing. Pump light is emitted from the pump light source assembly, passes through the pump shaping lens group 1-6, and is introduced into the slab heat sink module 3 via the waveguide 1-3. Specifically, the pump light output by the pump light source assembly is shaped by the pump shaping lens group 1-6 before entering the waveguide 1-3. The homogenization effect of the waveguide 1-3 further optimizes the pump transverse field distribution, and the pump light is then introduced into the slab heat sink module 3 via the waveguide 1-3.

[0033] On the basis of the above embodiment, as a preferred embodiment, the pump shaping lens group 1-6 includes a cylindrical convex lens 1, a cylindrical convex lens 2, and a cylindrical concave lens arranged in sequence along the optical path of the pump light, the cylindrical convex lens 1, the cylindrical convex lens 2, and the cylindrical concave lens are all movably connected to the shell, the curved surface center axis of the cylindrical convex lens 1 is arranged in the vertical direction, and the curved surface center axes of the cylindrical convex lens 2 and the cylindrical concave lens are both arranged in the horizontal direction.

[0034] Specifically, the distance between the cylindrical convex lens 1 and the cylindrical convex lens 2 is smaller than the distance between the cylindrical convex lens 2 and the cylindrical concave lens. The cylindrical convex lens 1 controls the spot size of the pump light in the horizontal direction, and the cylindrical convex lens 2 cooperates with the cylindrical concave lens to control the spot size of the pump light in the vertical direction. The distances between the cylindrical convex lens 1, the cylindrical convex lens 2, and the cylindrical concave lens are adjustable according to different parameters of the pump light source components. The bottoms of the cylindrical convex lens 1, the cylindrical convex lens 2, and the cylindrical concave lens are all connected to a moving block, which is slidably connected to the shell to adjust the distances between the cylindrical convex lens 1, the cylindrical convex lens 2, and the cylindrical concave lens as needed.

[0035] On the basis of the above embodiment, as a preferred embodiment, the water cooling device four includes a terminal water cooling plate 1-1 connected to the pump light source component, and a front end water cooling plate 1-2 arranged between the pump shaping lens group 1-6 and the waveguide 1-3, and the terminal water cooling plate 1-1 and the front end water cooling plate 1-2 are both provided with water channels, water inlets, and water outlets, and the terminal water cooling plate 1-1 and the front end water cooling plate 1-2 are both connected to the shell.

[0036] Based on the above embodiment, as a preferred embodiment, the pump light source assembly includes a connected laser diode guide assembly 1-4 and a laser diode array assembly 1-5. A temperature probe 1 is provided within the laser diode array assembly 1-5. The temperature probe 1 is connected to a control system 1 of a water cooling device 1. The temperature probe 1 monitors the temperature of the laser diode array assembly 1-5 in real time and, in conjunction with the water cooling device 1, dynamically adjusts the cooling temperature of the laser diode array assembly 1-5. This ensures that the peak wavelength of the pump light output remains stable around 808.6 nm at various pump currents, thereby improving the absorption efficiency of the slab gain medium for the pump light. By controlling the cooling temperature of the pump light, the power of the escaping pump light is significantly reduced, achieving lossless amplification of double-ended pumping without isolation, simplifying the pump structure and reducing manufacturing costs.

[0037] Specifically, the temperature probe 1 is connected to the control system 1 of the water cooling device 1. The control system 1 receives the temperature data from the temperature probe 1 and displays and stores it in real time. According to the set temperature range and the actual temperature data received, the control system 1 compares and judges. If the actual temperature exceeds the set range, the control system will issue an instruction to adjust the water cooling device 1 through the actuator. The control system 1 of the water cooling device 1 continuously monitors the temperature, compares the deviation, issues instructions, and adjusts the equipment until the actual temperature reaches the set range.

[0038] Specifically, the laser diode array components 1-5 can be replaced as needed.

[0039] Specifically, the terminal water-cooling plate 1-1 is fixed to the housing. A small hole is provided at the bottom of the terminal water-cooling plate 1-1 to facilitate the passage of the positive and negative cables of the laser diode array assembly 1-5. The terminal water-cooling plate 1-1 absorbs pump light reflected from the sides of the slab gain medium 3-4, pump light reflected from the pump shaping lens assembly 1-6, and escaped pump light, preventing such light from reaching the positive and negative cables of the laser diode array assembly 1-5 and potentially damaging them. The terminal water-cooling plate 1-1 absorbs the heat energy generated by the pump light and removes it via the water flow. The front water-cooling plate 1-2 is tightly attached to the housing. It absorbs pump light reflected from the sides of the slab gain medium 3-4 and escaped pump light, preventing the reflected light from reaching the inner wall of the housing and causing a continuous increase in its temperature.

[0040] On the basis of the above embodiment, as a preferred embodiment, Figure 3 As shown, the slab heat sink module 3 includes a slab gain medium 3-4, and heat sink microchannels 3-3 are provided on both sides of the slab gain medium 3-4. Heat sink guide blocks 3-6 are provided on the outside of the heat sink microchannels 3-3. The heat sink guide blocks 3-6 are respectively provided with two heat sink water inlets 3-1 and one heat sink water outlet 3-2 along the length direction of the slab gain medium 3-4, and the heat sink water outlet 3-2 is provided between the two heat sink water inlets 3-1.

[0041] Specifically, to ensure rapid heat dissipation from the slab gain medium 3-4, the heat sink microchannel 3-3 features internal fins with a thickness of 1mm, a fin pitch of 1.8mm, and a fin height of 10mm. Cooling water enters the heat sink microchannel 3-3 from one end face through a guide block. It then flows through multiple small branches within the microchannel, rapidly removing heat from the copper fins and achieving cooling.

[0042] On the basis of the above embodiment, as a preferred embodiment, the contact surface between the heat sink microchannel 3-3 and the slab gain medium 3-4 is provided with a groove 3-5, and a temperature probe 2 is provided in the groove 3-5. The temperature probe 2 is connected to the control system 2 of the water cooling device 2. The control system 2 receives the temperature data from the temperature probe 2 and displays and stores it in real time. According to the set temperature range and the actual temperature data received, the control system 2 compares and judges. If the actual temperature exceeds the set range, the control system will issue an instruction to adjust the water cooling device 2 through the actuator. The control system 2 of the water cooling device 2 continuously monitors the temperature, compares the deviation, issues instructions, and adjusts the equipment until the actual temperature reaches the set range.

[0043] Specifically, the groove 3-5 is 0.5 mm wide and 0.2 mm deep. Two temperature probes are glued into the groove 3-5, and two water cooling devices are synchronized to ensure the uniformity of the temperature distribution of the slab gain medium 3-4.

[0044] Specifically, three grooves 3-5 are provided, contacting the ends and center of the slab gain medium 3-4. These grooves precisely measure the temperature distribution of different regions of the slab gain medium 3-4 and dynamically regulate the temperature distribution of the slab gain medium 3-4 by controlling the flow rate and temperature of the heat sink water inlet 3-1 and outlet 3-2. The slab gain medium 3-4 is welded to the heat sink microchannel 3-3 using an indium soldering process, improving the efficiency of heat transfer from the crystal.

[0045] Specifically, since the pump is end-face pumped, the heat generated at both ends of the slab gain medium 3-4 is relatively high. Therefore, the heat sink inlet 3-1 of the heat sink guide block 3-6 is set near the two end faces of the slab gain medium 3-4, and the heat sink outlet 3-2 is set in the middle to ensure uniform distribution of the temperature of the slab gain medium 3-4.

[0046] On the basis of the above embodiment, as a preferred embodiment, Figure 4 As shown, the slab gain medium 3-4 adopts YAG+NG:YAG+YAG bonded crystal, and the two ends of the slab gain medium 3-4 are respectively set as inclined surfaces 3-7, and the laser is introduced into the slab gain medium 3-4 from the inclined surface 3-7 at any end.

[0047] Specifically, the inclined surface 3-7 is at an angle of 45 degrees, which prevents the generation of ASE and facilitates the introduction of pump light and the zigzag transmission of laser light.

[0048] Based on the above embodiment, as a preferred embodiment, the waveguide 1-3 is connected to the side of the slab gain medium 3-4, and the pump light is introduced from the side of the slab gain medium 3-4 into the side of the slab gain medium 3-4.

[0049] On the basis of the above embodiment, as a preferred embodiment, a cover plate assembly 2 is provided at the top and bottom of the slat heat sink module 3, and the cover plate assembly 2 includes an upper cover plate 2-1 and a lower cover plate which are detachably connected to the heat sink guide block 3-6 respectively, and the upper cover plate 2-1 is provided with a strip hole 2-3 for the sliding of the temperature detection assembly, and the lower cover plate is connected to the fixed base 4.

[0050] On the basis of the above embodiment, as a preferred embodiment, Figure 5 As shown, the temperature detection component includes a slider 2-4 that slides with the through hole 2-3, and the slider 2-4 is connected with a fixing groove 2-4-5 for clamping the temperature probe three. The temperature probe three is in contact with the top surface of the slab gain medium 3-4, and the temperature probe three is connected to the control system three of the water cooling device three. The control system three receives the temperature data from the temperature probe three and displays and stores it in real time. According to the set temperature range and the actual temperature data received, the control system three compares and judges. If the actual temperature exceeds the set range, the control system will issue an instruction to adjust the water cooling device three through the actuator. The control system three of the water cooling device three continuously monitors the temperature, compares the deviation, issues instructions, and adjusts the equipment until the actual temperature reaches the set range.

[0051] Specifically, the strip-shaped hole 2 - 3 facilitates the movement of the temperature probe 3 on the upper cover plate 2 - 1 to measure the temperatures of more test points of the slab gain medium 3 - 4 .

[0052] Specifically, the upper cover plate 2-1 is provided with four heat sink fixing holes 2-2, which cooperate with the holes in the heat sink guide block 3-6 to secure the two heat sinks of the slab gain medium 3-4. This prevents the heat sinks from being subjected to excessive tension and pressure when connected to the refrigeration device, which could cause crystals to fall off or be damaged. The heat sink fixing holes 2-2 are used to secure the upper cover plate 2-1 to the heat sink guide block 3-6 with screws, ensuring that the welded portion of the slab gain medium 3-4 and the heat sink does not separate due to excessive external forces.

[0053] Specifically, the slider 2 - 4 serves to fix or move the temperature probe 3.

[0054] Specifically, the upper cover plate 2-1 is provided with a slider slot 2-5, and the slider 2-4 can move forward and backward in the strip hole 2-3, and the slider plate 2-4-1 can be fixed on the slider slot 2-5 by the threaded column 2-4-2 in the slider 2-4 and the nut. Figure 6 As shown, the temperature probe fixing plate 2-4-3 is inserted into the threaded column 2-4-2. The threaded column 2-4-2 is provided with a top screw threaded hole 2-4-4. The top screw threaded hole 2-4-4 is used to adjust the downward depth of the temperature probe fixing plate 2-4-3 with the fixing groove 2-4-5 to ensure that the temperature probe 3 is closely attached to the side of the slat gain medium 3-4, thereby improving the accuracy of temperature measurement. The fixing groove 2-4-5 on the slider 2-4 fixes the temperature probe 3. At the same time, the temperature probe 3 is embedded in the fixing groove 2-4-5 to block most of the leaked pump light, thereby greatly reducing the absorption of pump light by the temperature probe 3.

[0055] Any details not provided in the present invention are conventional technical means known to those skilled in the art.

[0056] The above content shows and describes the basic principles, main features and beneficial effects of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A temperature-controlled double-end pumped slab laser amplifier, comprising end-pumped laser modules (1) respectively arranged at two ends of a slab heat sink module (3), wherein pump light is introduced from the end-pumped laser module (1) into a slab gain medium (3-4) in the slab heat sink module (3), and laser light is introduced from any end face of the slab gain medium (3-4) into the slab gain medium (3-4), characterized in that: The end-pump laser module (1) and the slab heat sink module (3) are both connected to a temperature detection component and a temperature control component. The temperature detection component comprises a first temperature probe for monitoring the temperature of the end-pump laser module (1), a second temperature probe for monitoring the side surface of the slab gain medium (3-4), and a third temperature probe for monitoring the top surface of the slab gain medium (3-4). The temperature control component comprises a first water cooling device and a fourth water cooling device for adjusting the temperature of the end-pump laser module (1), and also comprises a second water cooling device and a third water cooling device for adjusting the temperature of the slab heat sink module (3).

2. The temperature-controlled double-end pumped slab laser amplifier according to claim 1, characterized in that: A pump light source component is arranged in the housing, and pump light is emitted from the pump light source component and then passes through a pump shaping lens group (1-6) and is introduced into the slat heat sink module (3) through a waveguide (1-3).

3. The temperature-controlled double-end pumped slab laser amplifier according to claim 2, characterized in that: The pump shaping lens group (1-6) comprises a cylindrical convex lens 1, a cylindrical convex lens 2, and a cylindrical concave lens, which are arranged in sequence along the optical path of the pump light. The cylindrical convex lens 1, the cylindrical convex lens 2, and the cylindrical concave lens are all adjustably connected to the shell. The curved surface center axis of the cylindrical convex lens 1 is arranged in the vertical direction, and the curved surface center axes of the cylindrical convex lens 2 and the cylindrical concave lens are both arranged in the horizontal direction.

4. The temperature-controlled double-end pumped slab laser amplifier according to claim 2, characterized in that: The water cooling device 4 comprises a terminal water cooling plate (1-1) connected to the pump light source component, and a front end water cooling plate (1-2) arranged between the pump shaping lens group (1-6) and the waveguide (1-3), and the terminal water cooling plate (1-1) and the front end water cooling plate (1-2) are both connected to the shell.

5. The temperature-controlled double-end pumped slab laser amplifier according to claim 2 or 3, characterized in that: The pump light source component comprises a laser diode guide component (1-4) and a laser diode array component (1-5) which are connected to each other. The laser diode array component (1-5) is provided with a temperature probe 1, and the temperature probe 1 is connected to a control system 1 of a water cooling device 1.

6. The temperature-controlled double-end pumped slab laser amplifier according to any one of claims 1 to 3, characterized in that: Heat sink microchannels (3-3) are arranged on both sides of the slab gain medium (3-4), and heat sink guide blocks (3-6) are arranged on the outsides of the heat sink microchannels (3-3). The heat sink guide blocks (3-6) are respectively provided with two heat sink water inlets (3-1) and one heat sink water outlet (3-2) along the length direction of the slab gain medium (3-4), and the heat sink water outlet (3-2) is arranged between the two heat sink water inlets (3-1).

7. The temperature-controlled double-end pumped slab laser amplifier according to claim 5, characterized in that: A groove (3-5) is provided on the contact surface between the heat sink microchannel (3-3) and the slab gain medium (3-4), and the second temperature probe is provided in the groove (3-5). The second temperature probe is connected to the second control system of the second water cooling device.

8. The temperature-controlled double-end pumped slab laser amplifier according to claim 5, characterized in that: The slab gain medium (3-4) adopts a YAG+NG:YAG+YAG bonded crystal, and both ends of the slab gain medium (3-4) are respectively arranged as inclined surfaces (3-7), and the laser is introduced into the slab gain medium (3-4) from the inclined surface (3-7) at any end.

9. The temperature-controlled double-end pumped slab laser amplifier according to claim 5, characterized in that: The top and bottom of the slat heat sink module (3) are both provided with a cover plate assembly (2), the cover plate assembly (2) comprising an upper cover plate (2-1) and a lower cover plate respectively detachably connected to the heat sink guide block (3-6), the upper cover plate (2-1) being provided with a strip hole (2-3) for the temperature probe to slide, and the lower cover plate being connected to a fixed base (4).

10. The temperature-controlled double-end pumped slab laser amplifier according to claim 9, characterized in that: The strip hole (2-3) is slidably matched with a slider (2-4), the slider (2-4) is connected with a fixing groove (2-4-5) for clamping the temperature probe three, the temperature probe three is in contact with the top surface of the slab gain medium (3-4), and the temperature probe three is connected to the control system three of the water cooling device three.

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