Nonlinear crystal point-moving heat dissipation structure

Abstract

The utility model belongs to solid laser technical field, concretely provides a nonlinear crystal removes point heat radiation structure, including heat sink base, flexible heat conduction sheet and water cooling cavity, heat sink base sliding installation in water cooling cavity, flexible heat conduction sheet one end is connected with heat sink base, and the other end is connected with water cooling cavity, the utility model provides this nonlinear crystal removes point heat radiation structure and realizes the elastic connection of heat sink and water cooling cavity through flexible heat conduction sheet, and the heat is conducted to water cooling cavity through heat conduction sheet when not interfering nonlinear crystal movement, has solved the nonlinear crystal temperature control not steady, temperature rise that nonlinear crystal temperature control not steady, temperature rise caused by the heat conduction of point change mechanism difference, and the problem of the insufficient response speed of laser power instability, light output power rising of laser power instability, light output power rising.

Description

Technical Field

[0001] This invention belongs to the field of solid-state laser technology, specifically relating to a nonlinear crystal shifting heat dissipation structure. Background Technology

[0002] Nonlinear crystals are devices that convert fundamental infrared light into frequency-doubled ultraviolet light. They need to operate in a sealed, dust-free environment to extend their lifespan. However, nonlinear crystals withstand very high instantaneous energy during operation, and the light-transmitting point is easily damaged after a period of time. The industry commonly uses point-switching mechanisms to move the nonlinear crystal, disperse the energy deposition area, extend the crystal's lifespan, and optimize phase-matching conditions.

[0003] To achieve efficient phase matching, nonlinear crystals need to operate at a constant temperature. However, the presence of a large amount of scattered light within the laser cavity during operation causes the nonlinear crystal's temperature to rise. Therefore, thermoelectric coolers are typically used to control the nonlinear crystal's temperature. The heat generated by the thermoelectric cooler's temperature control needs to be conducted to the water-cooled cavity through a switching mechanism. To ensure movement accuracy, this switching mechanism generally uses structures such as ball bearings or rollers, resulting in a small contact area, high thermal resistance, and low heat transfer efficiency. This leads to problems such as increased nonlinear crystal temperature, reduced laser power, and slower laser output response. Utility Model Content

[0004] The purpose of this invention is to overcome the problem of low heat transfer efficiency between nonlinear crystals and water-cooled cavities in the prior art, which affects the laser performance.

[0005] To address this, the present invention provides a nonlinear crystal shifting heat dissipation structure, comprising a heat sink base, a flexible heat-conducting sheet, and a water-cooling cavity; the heat sink base is slidably installed in the water-cooling cavity; one end of the flexible heat-conducting sheet is connected to the heat sink base, and the other end is connected to the water-cooling cavity.

[0006] Specifically, the aforementioned flexible heat-conducting sheet is an arc-shaped flexible heat-conducting sheet, with one end of the arc-shaped flexible heat-conducting sheet attached to the heat sink base and the other end attached to the water-cooling cavity.

[0007] Specifically, the aforementioned flexible heat-conducting sheet is provided with a heat sink base contact area and a heat conduction enhancement area; the heat conduction enhancement area is coated with a graphene coating.

[0008] Specifically, the aforementioned nonlinear crystal shifting heat dissipation structure also includes a semiconductor cooler; the heat sink base is mounted on the semiconductor cooler.

[0009] Specifically, the water-cooled cavity is equipped with a slide rail; the heat sink base is mounted on a guide slide; and the guide slide is slidably mounted on the slide rail.

[0010] Specifically, the aforementioned nonlinear crystal shifting heat dissipation structure also includes a driving component; the output end of the driving component is connected to the heat sink base.

[0011] Specifically, the two ends of the aforementioned flexible heat-conducting sheet are detachably connected to the heat sink base and the water-cooling cavity respectively via fasteners.

[0012] Specifically, the aforementioned fasteners include a pressure plate and bolts; the pressure plate, the heat sink base, and the water-cooled cavity are all provided with threaded holes that match the bolts.

[0013] Specifically, the aforementioned nonlinear crystal shifting heat dissipation structure includes multiple sets of flexible heat-conducting sheets.

[0014] Specifically, the aforementioned nonlinear crystal shifting heat dissipation structure also includes a crystal mounting bracket; the crystal mounting bracket is mounted on the heat sink base.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0016] The nonlinear crystal shifting heat dissipation structure provided by this utility model achieves an elastic connection between the heat sink and the water-cooling cavity through a flexible heat-conducting sheet. While not interfering with the movement of the nonlinear crystal, heat is conducted to the water-cooling cavity through the heat-conducting sheet. This solves the problem of unstable temperature control and temperature rise of the nonlinear crystal caused by poor thermal conductivity of the shifting mechanism, which in turn leads to unstable laser power and insufficient response speed for increasing output power.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This utility model provides a planar schematic diagram of a nonlinear crystal shifting point heat dissipation structure.

[0019] Figure 2 This utility model provides a partial schematic diagram of a nonlinear crystal shifting point heat dissipation structure.

[0020] Explanation of reference numerals in the attached drawings: 1. Heat sink base; 2. Flexible heat-conducting sheet; 3. Semiconductor cooler; 4. Guide slide; 5. Drive component; 6. Water-cooled cavity; 7. Pressure plate; 8. Bolt; 9. Crystal mounting bracket; 10. Nonlinear crystal. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] Reference Figure 1-2 This invention provides a nonlinear crystal shifting heat dissipation structure, including a heat sink base 1, a flexible heat-conducting plate 2, and a water-cooling cavity 6. The heat sink base 1 is slidably installed inside the water-cooling cavity 6. One end of the flexible heat-conducting plate 2 is connected to the heat sink base 1, and the other end is connected to the water-cooling cavity 6. In use, the nonlinear crystal 10 is installed on the heat sink base 1. The shifting distance of the nonlinear crystal 10 is generally on the order of millimeters or micrometers. The flexible heat-conducting plate 2 achieves an elastic connection between the heat sink and the water-cooling cavity 6. While not interfering with the movement of the nonlinear crystal 10, heat is conducted to the water-cooling cavity 6 through the heat-conducting plate, thus improving heat transfer efficiency.

[0024] Specifically, the flexible heat-conducting sheet 2 is a curved flexible heat-conducting sheet formed by bending. One side of the curved flexible heat-conducting sheet is attached to the heat sink base 1, and the other side is attached to the water-cooling cavity 6. By utilizing the elastic space after bending, the resistance of the heat-conducting sheet to the movement of the nonlinear crystal 10 is reduced, and the total length is minimized to shorten the heat conduction distance of the heat-conducting sheet.

[0025] Furthermore, the flexible heat-conducting sheet 2 is provided with a heat sink base contact area and a thermal conductivity enhancement area; the thermal conductivity enhancement area is coated with a graphene coating. Graphene can enhance the thermal conductivity of the heat-conducting sheet in the horizontal direction.

[0026] Optionally, the nonlinear crystal shifting heat dissipation structure includes multiple sets of flexible heat-conducting plates 2. These plates are connected to the heat sink base 1 and the water-cooling cavity 6 at different locations to achieve multi-point heat dissipation and improve heat transfer efficiency. The number and specific locations of the flexible heat-conducting plates 2 can be designed according to actual needs.

[0027] In order to control the temperature of the nonlinear crystal 10, the nonlinear crystal shifting heat dissipation structure also includes a semiconductor cooler 3; the heat sink base 1 is mounted on the semiconductor cooler 3.

[0028] In one detailed embodiment, the water-cooled cavity 6 is provided with a slide rail; the heat sink base 1 is mounted on the guide slide 4; the guide slide 4 is slidably mounted on the slide rail. The guide slide 4 can be made of a thermally conductive material, and heat can also be conducted to the water-cooled cavity 6 through the guide slide 4, thereby improving heat dissipation efficiency.

[0029] Furthermore, the nonlinear crystal shifting heat dissipation structure also includes a driving component 5; the driving component 5 is located outside the water-cooling cavity 6, and its output end extends into the water-cooling cavity 6 and is connected to the heat sink base 1. The driving component 5 drives the heat sink base 1 to move, thereby realizing the shifting of the nonlinear crystal 10. The driving component 5 can be a motor or other feasible driving device.

[0030] In one optimized embodiment, the two ends of the flexible heat-conducting sheet 2 are detachably connected to the heat sink base 1 and the water-cooling cavity 6 respectively by fasteners.

[0031] Specifically, the fasteners include a pressure plate 7 and bolts 8; threaded holes matching the bolts 8 are provided on the pressure plate 7, the heat sink base 1, and the water-cooled cavity 6. In use, one end of the flexible heat-conducting sheet 2 is attached to the mounting surface of the heat sink base 1 or the water-cooled cavity 6, the pressure plate 7 abuts against the flexible heat-conducting sheet 2, and the bolts 8 are inserted into the corresponding threaded holes, clamping the flexible heat-conducting sheet 2 between the pressure plate 7 and the mounting surface of the heat sink base 1 or the water-cooled cavity 6, thus completing the flexible connection between the heat sink base 1 and the water-cooled cavity 6.

[0032] Furthermore, the nonlinear crystal shifting heat dissipation structure also includes a crystal mounting bracket 9; see reference. Figure 2 The crystal mounting bracket 9 is mounted on the heat sink base 1, and the nonlinear crystal 10 is mounted on the crystal mounting bracket 9.

[0033] Example 1:

[0034] This embodiment provides a nonlinear crystal shifting heat dissipation structure, including a crystal mounting bracket 9, a heat sink base 1, a semiconductor cooler 3, a guide slide 4, a stepper motor, a flexible heat-conducting sheet 2, and a water-cooled cavity 6.

[0035] A crystal mounting bracket 9 is mounted on a heat sink base 1, which is mounted on a semiconductor cooler 3. The semiconductor cooler 3 is mounted on a guide slide 4. A slide rail is provided inside the water-cooled cavity 6, and the guide slide 4 is slidably mounted on the slide rail. The output end of the stepper motor is connected to the heat sink base 1.

[0036] The flexible heat-conducting sheet 2 is a 13mm wide and 0.2mm thick copper sheet. Except for the surface in contact with the heat sink base 1, the surface of the flexible heat-conducting sheet 2 is coated with graphene. The flexible heat-conducting sheet 2 is bent into an arc shape, with one end attached to the heat sink base 1 via a fixing component, and the other end attached to the water-cooling cavity 6 via a fixing component. The horizontal heat conduction distance inside the heat-conducting sheet is approximately 12.5mm. The fixing components include a pressure plate 7 and bolts 8; threaded holes matching the bolts 8 are provided on the pressure plate 7, the heat sink base 1, and the water-cooling cavity 6. The pressure plate 7 presses against the flexible heat-conducting sheet 2, and the bolts 8 are inserted into the corresponding threaded holes, clamping the flexible heat-conducting sheet 2 between the pressure plate 7 and the mounting surface of the heat sink base 1 or the water-cooling cavity 6.

[0037] In use, the nonlinear crystal 10 is mounted on the crystal mounting bracket 9, and point switching is achieved under the drive of a stepper motor. Simultaneously, the heat generated during operation is conducted to the water-cooled cavity 6 via a heat sink, heat-conducting plate, and guide slide 4. In this example, the internal horizontal heat conduction distance of the heat-conducting plate is approximately 12.5 mm, and under these conditions, the horizontal thermal resistance is approximately 5°C / W. The target temperature of the nonlinear crystal 10 is approximately 30°C, the stray photothermal power is approximately 2W, and the maximum cooling efficiency of the thermoelectric cooler is approximately 5W (at which point the temperatures at both ends of the cooler are the same). The higher the temperature of the hot end of the thermoelectric cooler, the worse the cooling efficiency. Without the heat dissipation structure provided in this embodiment, the cold end temperature of the thermoelectric cooler is approximately 30°C, and the hot end is approximately 53°C (during mass production, the cold end temperature may exceed 30°C, at which point the temperature control system will collapse, and the laser power will drop significantly). After using the above heat dissipation structure, the cold end temperature is approximately 30°C, and the hot end temperature is approximately 42°C. The efficiency of the thermoelectric cooler is improved, and the temperature control collapse no longer occurs.

[0038] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. A non-linear crystal point-moving heat dissipation structure, characterized in that: It includes a heat sink base (1), a flexible heat-conducting plate (2), and a water-cooled cavity (6); the heat sink base (1) is slidably installed in the water-cooled cavity (6); one end of the flexible heat-conducting plate (2) is connected to the heat sink base (1), and the other end is connected to the water-cooled cavity (6).

2. The non-linear crystal point-moving heat dissipation structure according to claim 1, wherein: The flexible heat-conducting sheet (2) is an arc-shaped flexible heat-conducting sheet. One end of the arc-shaped flexible heat-conducting sheet is attached to the heat sink base (1), and the other end is attached to the water-cooling cavity (6).

3. The non-linear crystal point-moving heat dissipation structure according to claim 1, wherein: the non-linear crystal is a KTP crystal. The flexible heat-conducting sheet (2) is provided with a heat sink base contact area and a heat-conducting enhancement area; the heat-conducting enhancement area is coated with a graphene coating.

4. The non-linear crystal point-moving heat dissipation structure of claim 1, wherein: It also includes a semiconductor cooler (3); the heat sink base (1) is mounted on the semiconductor cooler (3).

5. The non-linear crystal point-moving heat dissipation structure according to claim 1, wherein: the non-linear crystal is a KTP crystal. The water-cooled cavity (6) is provided with a slide rail; the heat sink base (1) is installed on the guide slide (4); the guide slide (4) is slidably installed on the slide rail.

6. The non-linear crystal point-moving heat dissipation structure of claim 1, wherein: It also includes a drive unit (5); the output end of the drive unit (5) is connected to the heat sink base (1).

7. The non-linear crystal point-moving heat dissipation structure according to claim 1, wherein: The flexible heat-conducting sheet (2) is detachably connected to the heat sink base (1) and the water-cooled cavity (6) respectively through fasteners.

8. The non-linear crystal point-moving heat dissipation structure according to claim 7, wherein: The fasteners include a pressure plate (7) and a bolt (8); the pressure plate (7), the heat sink base (1) and the water-cooled cavity (6) are all provided with threaded holes that match the bolt (8).

9. The non-linear crystal point-moving heat dissipation structure of claim 1, wherein: Includes multiple sets of flexible heat-conducting sheets (2).

10. The non-linear crystal point-moving heat dissipation structure of claim 1, wherein: It also includes a crystal mounting bracket (9); the crystal mounting bracket (9) is mounted on the heat sink base (1).

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