A cooling system for a laser amplifier

Abstract

The present invention discloses a laser amplifier cooling system, including a fluid storage box, a microchannel heat sink, a laser crystal medium, an indium layer, a pump homogenization coupling device and a refrigerator; the pump homogenization coupling device is arranged relative to the laser crystal medium, the laser crystal medium is abutted against the indium layer, and the indium layer is arranged at the bottom of the microchannel heat sink; a plurality of flow guiding cavities are equidistantly provided in the microchannel heat sink, an inlet I is provided in the middle of the top of each flow guiding cavity, and an outlet I is provided at both ends of each flow guiding cavity; the output end of the fluid storage box is connected to the inlet I of the flow guiding cavity, the outlet I of the flow guiding cavity is connected to the refrigerator, and the output end of the refrigerator is connected to the input end of the fluid storage box. The present invention can cyclically diffuse the heat of the laser crystal medium to the surroundings to the entire body, so that the heat conduction effect is balanced and effective.

Description

Technical Field

[0001] The invention belongs to the field of laser amplifier heat dissipation, and in particular relates to a laser amplifier cooling system. Background Art

[0002] Since the birth of lasers in the 1860s, after more than half a century of development, laser technology has been widely used in industry, science, military, communications and other fields. The new generation of all-solid-state lasers using high-power laser diode arrays as pumping sources has become one of the important technical approaches to achieve high repetition rate and high energy laser output. However, as the average power output of solid-state lasers increases, the heat in the laser crystal medium also increases. If the heat cannot be dissipated in time, the temperature of the laser crystal medium will rise rapidly, which will cause a series of adverse effects such as a decrease in laser output power and beam quality. Therefore, high-power lasers must have an efficient and stable crystal medium heat dissipation system.

[0003] When the laser crystal medium is subjected to high-power pumping light, an uneven heat source will be formed inside it, resulting in uneven temperature distribution inside the laser crystal medium, and then generating temperature gradients in different directions. The temperature gradient inside the laser crystal medium can lead to adverse thermal effects such as thermal deformation and thermal stress, and even cause the laser crystal medium to explode.

[0004] Therefore, designing an efficient cooling system that can quickly remove the useless heat inside the laser crystal medium and thereby reduce the thermal effect inside the medium is one of the key technologies that must be overcome in order for solid-state lasers to achieve higher power output.

[0005] Laser crystal media require the corresponding cooling devices to have efficient heat dissipation capabilities. Conventional microchannel cooling technology not only has a large pressure drop, but also the fluid in the microchannel heats up during the flow process due to heat absorption, causing the temperature at the rear of the microchannel to be higher than the front, which makes the local temperature of the laser crystal medium uneven and the temperature equalization effect poor, making it difficult to meet the cooling requirements of laser crystal media containing high heat flux density. For simple jet cooling technology, although the heat on the solid surface can be taken away as much as possible by relying on a large jet flow rate, the heat transfer coefficient outside the jet impact area will decrease sharply, which will also cause poor overall temperature equalization effect.

[0006] Therefore, the present application proposes a laser amplifier cooling system. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a laser amplifier cooling system capable of cyclically cooling the laser crystal medium in a balanced manner.

[0008] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0009] The present invention provides a laser amplifier cooling system, comprising a fluid storage box, a microchannel heat sink, a laser crystal medium, an indium layer, a pump homogenization coupling device and a refrigerator;

[0010] The pump homogenization coupling device is arranged opposite to the laser crystal medium, the laser crystal medium is in contact with the indium layer, and the indium layer is arranged at the bottom of the microchannel heat sink;

[0011] A plurality of flow guiding cavities are equidistantly provided in the microchannel heat sink, an inlet I is provided in the middle of the top of each flow guiding cavity, and outlets I are provided at both ends of each flow guiding cavity;

[0012] The output end of the fluid storage box is connected to the inlet I of the diversion cavity, the outlet I of the diversion cavity is connected to the refrigerator, and the output end of the refrigerator is connected to the input end of the fluid storage box.

[0013] Furthermore, a cover plate is provided on the top of the microchannel heat sink, and a through hole matching the inlet I is opened on the cover plate;

[0014] Furthermore, the guide cavity is configured to be rectangular.

[0015] Further, the laser amplifier cooling system includes a fluid homogenization module;

[0016] The fluid homogenization module includes a rubber hose II and an expansion section;

[0017] One end of the rubber hose II is connected to the output end of the fluid storage box, and the other end of the rubber hose II is provided with an expansion section, on which a plurality of outlets II are opened, and each outlet II is crimped with the inlet I.

[0018] Furthermore, a wide-mouth section is provided between the rubber hose II and the expansion section, and an array of orifice plates is provided in the wide-mouth section, and each array of orifice plates is arranged opposite to the outlet II.

[0019] Further, the array orifice plate comprises a plurality of array orifice plates arranged opposite to each other;

[0020] The diameters of the circular holes of each array orifice plate are different.

[0021] Further, the laser amplifier cooling system comprises two oppositely arranged fluid coupling modules;

[0022] Each fluid coupling module includes a rubber hose III, a necking section and a clamping section;

[0023] One end of the clamping section is connected to the outlet II, and the other end of the clamping section is connected to the necking section, the necking section is connected to the rubber hose III, and the rubber hose III is connected to the refrigerator.

[0024] Further, the laser amplifier cooling system includes an intelligent pump, a temperature detector and a control module;

[0025] The input end of the temperature detector is arranged at one side of the laser crystal medium, the output end of the temperature detector is connected to the control module, the output end of the control module is connected to the intelligent pump, and the intelligent pump is connected to the fluid storage tank.

[0026] Furthermore, the laser amplifier cooling system comprises a pressure detector I, a pressure detector II and a flow meter;

[0027] The pressure detector I is arranged at the input end of the microchannel heat sink;

[0028] The pressure detector II is arranged at the output end of the microchannel heat sink;

[0029] The flow meter is arranged at the input end of the refrigerator;

[0030] The output ends of the pressure detector I, the pressure detector II and the flow meter are all connected to the control module.

[0031] Furthermore, the laser amplifier cooling system comprises a pressure stabilizing tank, a filter, a stop valve I and a stop valve II;

[0032] The pressure stabilizing tank, stop valve I and filter are arranged in sequence between the intelligent pump and the pressure detector I;

[0033] The stop valve II is arranged between the refrigerator and the fluid storage tank.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention provides a microchannel heat sink with multiple guide cavities, the fluid parameters in each guide cavity are the same, and the fluids in each guide cavity do not affect each other when flowing in the microchannel heat sink, thereby avoiding the occurrence of large temperature differences of the fluids in the microchannel heat sink, and being able to diffuse the heat of the laser crystal medium to the entire body in all directions, so that the heat conduction effect is balanced and effective; the present invention provides a refrigerator to cool the heated fluid for circulation, thereby forming a closed system that is less affected by the external environment, is not only convenient for installation and management, but also saves resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of an embodiment of a cooling system for a laser amplifier of the present invention;

[0037] Figure 2 It is a schematic structural diagram of an embodiment of a microchannel heat sink of the present invention;

[0038] Figure 3 It is a schematic diagram of a flow state of the fluid in the diversion cavity of the present invention;

[0039] Figure 4 It is a flow state schematic diagram of the fluid homogenization module of the present invention;

[0040] Figure 5 It is a schematic structural diagram of an embodiment of the array orifice plate of the present invention;

[0041] Figure 6 It is a schematic diagram of a flow state of the fluid coupling module of the present invention;

[0042] In the figure: 1. fluid storage box, 2. intelligent pump, 3. pressure regulating tank, 4. stop valve I, 5. filter, 6. pressure detector I, 7. fluid homogenization module, 8. microchannel heat sink, 9. fluid coupling module, 10. laser crystal medium, 11. pump homogenization coupling device, 12. flow meter, 13. refrigerator, 14. temperature detector, 15. control module, 701. rubber hose II, 702. wide mouth section, 703. expansion section, 704. outlet II, 802. cover plate, 803. through hole, 804. outlet I, 901. rubber hose III, 902. necking section, 903. clamping section. DETAILED DESCRIPTION

[0043] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and cannot be used to limit the protection scope of the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the present invention, it should be noted that, 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 the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0046] Example 1

[0047] This embodiment provides a laser amplifier cooling system.

[0048] The laser amplifier cooling system of this embodiment includes a fluid storage box 1 , a microchannel heat sink 8 , a laser crystal medium 10 , an indium layer, a pump homogenization coupling device 11 and a refrigerator 13 .

[0049] refer to Figure 1 The pump homogenization coupling device 11 is arranged opposite to the laser crystal medium 10 .

[0050] In the application, the pump homogenization coupling device 11 couples the pump light with a peak power of 56KW to the surface of the laser crystal medium 10. The spot area of ​​the pump light is 30*30mm, the size of the laser crystal medium is 40*40mm, and the laser crystal medium 10 generates a large amount of heat energy.

[0051] refer to Figure 1 The laser crystal medium 10 is in contact with the indium layer, and the indium layer is disposed at the bottom of the microchannel heat sink.

[0052] In applications, the laser crystal medium 10 transfers heat energy to the bottom and fins of the microchannel heat sink 8 by heat conduction.

[0053] Parameter control Figure 2 A plurality of rectangular flow-guiding cavities made of copper are evenly spaced in the microchannel heat sink 8. Figure 3 An inlet I is provided in the middle of the top of each guide cavity, and an outlet I 804 is provided at both ends of each guide cavity.

[0054] Among them, the output end of the fluid storage tank 1 is connected to the inlet I of the guide cavity, and the outlet I804 of the guide cavity is connected to the refrigerator 13. The refrigerator 13 is a compression refrigerator. The output end of the refrigerator 13 is connected to the input end of the fluid storage tank 1 to form a closed-loop system.

[0055] In the application, the fluid enters the guide cavity through the inlet I and is divided into two paths, flowing out of the microchannel heat sink 8 from the outlets I804 at both ends. In the process, the fluid takes away the heat in the bottom and fins of the microchannel heat sink by heat conduction. The heated fluid flows out from the outlet I804 and enters the refrigerator 13. After the temperature of the fluid drops to a preset value through the refrigerator 13, it returns to the fluid storage tank 1, which not only allows the fluid to be recycled, but also ensures that the system can operate normally and stably.

[0056] refer to Figure 2 A cover plate 802 is provided on the top of the microchannel heat sink 8. In application, the cover plate and the microchannel heat sink are tightly bonded with an adhesive to prevent fluid from overflowing. In addition, a through hole 803 matching the inlet I is opened on the cover plate 802. In application, the through hole 803 is connected to the inlet I.

[0057] The present invention provides a microchannel heat sink with multiple guide cavities. The fluid parameters in each guide cavity are the same, and the fluids in each guide cavity do not affect each other when flowing in the microchannel heat sink, thereby avoiding the occurrence of large differences in fluid temperature in the microchannel heat sink. The heat of the laser crystal medium can be diffused to the entire body, so that the heat conduction effect is balanced and effective.

[0058] The present invention provides a refrigerator to cool the heated fluid for circulation, thereby forming a closed system that is less affected by the external environment, is easy to install and manage, and saves resources.

[0059] Example 2

[0060] Based on Example 1, the laser amplifier cooling system of this embodiment includes a fluid homogenization module and two fluid coupling modules.

[0061] The fluid homogenizing module 7 of this embodiment includes a rubber hose II 701 , a wide-mouth section 702 and an expansion section 703 .

[0062] refer to Figure 4 One end of the rubber hose II 701 is connected to the output end of the fluid storage tank 1, that is, the fluid enters the fluid homogenization module 7 from the rubber hose II 701; the other end of the rubber hose II 701 is connected to the wide-mouth section 702. During application, the flow channel of the wide-mouth section 702 suddenly widens, and the fluid becomes turbulent; the wide-mouth section 702 is tightly fitted to the expansion section 703 by bonding to prevent the fluid from overflowing; a plurality of outlets II 704 are provided on the expansion section 703, which can evenly divide the fluid into multiple beams to form a jet array, and each jet array has the same parameters to improve the temperature uniformity capability.

[0063] In application, the size of outlet II 704 is slightly smaller than that of inlet I, and the number and quantity of outlet II correspond to the number and position of inlet I one by one, and each outlet II 704 is crimped to the corresponding inlet I to prevent fluid overflow.

[0064] The wide mouth section 702 is provided with a copper array plate. Figure 5 , each array orifice plate is arranged opposite to the outlet II 704.

[0065] In addition, the array orifice plate includes a plurality of array orifice plates arranged relatively to each other. The circular holes on the array orifice plate can homogenize the fluid, enhance the consistency and directionality of the fluid, and make the fluid flow rate of each circular hole the same, so as to achieve a uniform temperature effect.

[0066] In the application, the diameter of the circular holes of each array orifice plate is different, which can not only make the fluid uniform and diffuse in the wide-mouth section 702, but also make the fluid transition from the small-sized outlet to the large-sized outlet II 704. Among them, the diameter of the circular hole is less than or equal to 16mm; the outlet II 704 is a 50*50mm square.

[0067] In this embodiment, fluid coupling modules 9 are respectively provided on both sides of the microchannel heat sink.

[0068] Each fluid coupling module 9 of this embodiment includes a rubber hose III 901, a copper-made necking section 902, and a copper-made clamping section 903. The diameter of the rubber hose III 901 is 11 mm, and the length of the clamping section 903 is 15 mm.

[0069] refer to Figure 6 One end of the clamping section 903 is connected to the outlet II 704 , and the other end of the clamping section 903 is connected to the necking section 902 . The necking section 902 is connected to the rubber hose III 901 , and the rubber hose III 901 is connected to the refrigerator 13 .

[0070] In application, the outlets I804 at both ends of the flow guiding cavity are connected to the clamping sections 903 of the corresponding fluid coupling modules 9 by sleeve connection; the rubber hoses III901 of the two fluid coupling modules 9 are connected to the refrigerator 13 by three-way joints.

[0071] Example 3

[0072] On the basis of Example 1 or 2, the laser amplifier cooling system of this embodiment includes a pressure detector I6, a pressure detector II, a flow meter 12, an intelligent pump 2, a temperature detector 14 and a control module 15.

[0073] refer to Figure 1 The input end of the temperature detector 14 is arranged at one side of the laser crystal medium 10 to detect the temperature of the laser crystal medium 10; the pressure detector Ⅰ6 is arranged at the input end of the microchannel heat sink 8 to detect the fluid pressure in the pipeline at the input end of the microchannel heat sink 8; the pressure detector Ⅱ is arranged at the output end of the microchannel heat sink to detect the fluid pressure in the pipeline at the output end of the microchannel heat sink 8; the flow meter 12 is arranged at the input end of the refrigerator 13 to detect the fluid flow in the pipeline at the input end of the refrigerator 13.

[0074] In the application, the output ends of the pressure detector Ⅰ6, the pressure detector Ⅱ, the flow meter 12 and the temperature detector 14 are all connected to the control module 15. The control module 15 controls the current of the smart pump 2 according to the temperature of the laser crystal medium 10, the fluid pressure in the pipeline and the fluid flow rate, so as to regulate the pumping capacity of the smart pump 2 for the fluid in the fluid storage tank 1, so that the temperature of the laser crystal medium 10, the fluid pressure in the pipeline and the fluid flow rate are always maintained within a preset range.

[0075] Example 4

[0076] On the basis of embodiments 1-3, the laser amplifier cooling system of this embodiment includes a voltage stabilizing tank 3, a filter 5, a stop valve I4 and a stop valve II.

[0077] The laser amplifier cooling system of this embodiment includes a voltage stabilizing tank 3, a filter 5, a stop valve I4 and a stop valve II.

[0078] refer to Figure 1 The pressure stabilizing tank 3, the stop valve Ⅰ4 and the filter 5 are arranged in sequence between the intelligent pump 2 and the pressure detector Ⅰ.

[0079] In the application, the fluid in the fluid storage tank 1 is pumped out by the smart pump 2 and enters the pressure-stabilizing tank 3 to form a fluid with a stable pressure, so that the fluid flows smoothly. The stop valve 4 allows the fluid to flow in one direction only to prevent the fluid from flowing back and causing abnormal pressure in the pipeline. When the fluid passes through the filter 5, the filter 5 filters out impurities in the fluid to ensure that the fluid will not cause blockage in the system.

[0080] refer to Figure 1 The stop valve II is arranged between the refrigerator 13 and the fluid storage tank 1, so that the cooled fluid enters the fluid storage tank 1 for the next circulation.

[0081] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A laser amplifier cooling system, characterized in that: It comprises a fluid storage box (1), a fluid homogenization module (7), a microchannel heat sink (8), a laser crystal medium (10), an indium layer, a pump homogenization coupling device (11) and a refrigerator (13); The pump homogenization coupling device (11) is arranged opposite to the laser crystal medium (10), the laser crystal medium (10) is in contact with the indium layer, and the indium layer is arranged at the bottom of the microchannel heat sink; A plurality of flow guiding cavities are equidistantly provided in the microchannel heat sink (8), an inlet I is provided in the middle of the top of each flow guiding cavity, and outlets I (804) are provided at both ends of each flow guiding cavity; The output end of the fluid storage tank (1) is connected to the inlet I of the guide cavity, the outlet I (804) of the guide cavity is connected to the refrigerator (13), and the output end of the refrigerator (13) is connected to the input end of the fluid storage tank (1); The fluid homogenization module (7) comprises a rubber hose II (701) and an expansion section (703); One end of the rubber hose II (701) is connected to the output end of the fluid storage box (1), and the other end of the rubber hose II (701) is provided with an expansion section (703). The expansion section (703) is provided with a plurality of outlets II (704), and each outlet II (704) is crimped to the inlet I.

2. The laser amplifier cooling system according to claim 1, characterized in that: A cover plate (802) is provided on the top of the microchannel heat sink (8), and a through hole (803) matching the inlet I is provided on the cover plate (802).

3. The laser amplifier cooling system according to claim 1, characterized in that: The guide cavity is configured to be rectangular.

4. The laser amplifier cooling system according to claim 1, wherein: A wide-mouth section (702) is provided between the rubber hose II (701) and the expansion section (703), and an array of orifice plates is provided in the wide-mouth section (702), and each array of orifice plates is arranged opposite to the outlet II (704).

5. The laser amplifier cooling system according to claim 4, characterized in that: The array orifice plate comprises a plurality of array orifice plates arranged opposite to each other; The diameters of the circular holes of each array orifice plate are different.

6. The laser amplifier cooling system according to claim 1, characterized in that: It comprises two fluid coupling modules (9) arranged opposite to each other; Each fluid coupling module (9) comprises a rubber hose III (901), a necking section (902) and a clamping section (903); One end of the clamping section (903) is connected to the outlet II (704), and the other end of the clamping section (903) is connected to the necking section (902). The necking section (902) is connected to the rubber hose III (901), and the rubber hose III (901) is connected to the refrigerator (13).

7. The laser amplifier cooling system according to claim 1, characterized in that: It comprises an intelligent pump (2), a temperature detector (14) and a control module (15); The input end of the temperature detector (14) is arranged on one side of the laser crystal medium (10), the output end of the temperature detector (14) is connected to the control module (15), the output end of the control module (15) is connected to the intelligent pump (2), and the intelligent pump (2) is connected to the fluid storage tank (1).

8. The laser amplifier cooling system according to claim 7, characterized in that: It includes a pressure detector I (6), a pressure detector II and a flow meter (12); The pressure detector I (6) is arranged at the input end of the microchannel heat sink (8); The pressure detector II is arranged at the output end of the microchannel heat sink; The flow meter (12) is arranged at the input end of the refrigerator (13); The output ends of the pressure detector I (6), the pressure detector II and the flow meter (12) are all connected to the control module (15).

9. The laser amplifier cooling system according to claim 8, characterized in that: It includes a pressure stabilizing tank (3), a filter (5), a stop valve I (4) and a stop valve II; The pressure stabilizing tank (3), the stop valve I (4) and the filter (5) are arranged in sequence between the intelligent pump (2) and the pressure detector I; The stop valve II is arranged between the refrigerator (13) and the fluid storage tank (1).

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