Laser resonant cavity for enhancing heat dissipation performance of gain medium and heat dissipation method

Abstract

The invention discloses a laser resonant cavity capable of strengthening the heat dissipation performance of a gain medium and a heat dissipation method, and belongs to the field of laser optical-mechanical structure design. Comprising a laser sealing cavity and a gain medium welding part installed in the laser sealing cavity, and the gain medium welding part is fixed in the laser sealing cavity through a resonant cavity support. The resonant cavity support comprises a support body and a heat pipe assembly installed on the support body, the heat absorption end of the heat pipe assembly is connected with the gain medium welding part, and the heat dissipation end of the heat pipe assembly is connected with a shell of the laser sealing cavity through a heat transfer assembly. Heat generated by the gain medium welding part is sequentially transmitted to the heat transmission assembly and the shell through the heat pipe assembly, so that heat dissipation of the gain medium is completed. The problem that an existing small laser product is narrow in space and cannot dissipate heat in time is solved.

Description

Technical Field

[0001] The invention belongs to the field of laser optical-mechanical structure design, and in particular relates to a laser resonant cavity and a heat dissipation method for enhancing the heat dissipation performance of a gain medium. Background Art

[0002] The demand for miniaturization and lightweight of airborne laser products is becoming increasingly strong, and the energy requirements are also getting higher and higher. Under the condition of limited space, the heat dissipation demand of the gain medium in the laser sealed cavity is increasing. Generally, the gain medium components are directly installed on the laser sealed shell or the resonant cavity bracket. This method is difficult to solve the heat dissipation problem of the gain medium when facing higher energy requirements. Poor heat dissipation of the gain medium will cause a series of problems such as poor laser beam spot, large energy fluctuations, and energy decline. Summary of the invention

[0003] Technical issues to be solved:

[0004] In order to avoid the shortcomings of the prior art, the present invention provides a laser resonant cavity and a heat dissipation method for enhancing the heat dissipation performance of the gain medium. A heat pipe is used to quickly transfer the heat generated by the gain medium laser rod to the outside of the heat source, which can improve the heat dissipation performance of the miniaturized laser gain medium and solve the problem that the existing miniature laser products have limited space and cannot dissipate heat in time.

[0005] The technical solution of the present invention is: a laser resonant cavity with enhanced heat dissipation performance of a gain medium, comprising a laser sealed cavity and a gain medium welding component installed therein, wherein the gain medium welding component is fixed in the laser sealed cavity through a resonant cavity bracket;

[0006] The resonant cavity bracket includes a bracket body and a heat pipe assembly installed thereon, the heat absorbing end of the heat pipe assembly is connected to the gain medium welding component, and the heat dissipating end is connected to the shell of the laser sealed cavity through a heat transfer assembly; the heat generated by the gain medium welding component is transferred to the heat transfer assembly and the shell in sequence through the heat pipe assembly to complete the heat dissipation of the gain medium.

[0007] A further technical solution of the present invention is: the gain medium welding component comprises a gain medium laser rod and a laser rod welding heat sink, and the gain medium laser rod is welded to a side surface of the laser rod welding heat sink.

[0008] A further technical solution of the present invention is: the heat pipe assembly is composed of a plurality of heat pipes arranged in parallel, the middle part of the heat pipe assembly is embedded in the welding cover plate of the heat pipe end-absorbing end, and the welding cover plate of the heat pipe end-absorbing end is in contact with the other side surface of the laser rod welding heat sink, so that the heat pipe assembly is located directly below the gain medium welding component; the two ends of the heat pipe assembly extend toward the shell wall respectively, and are embedded in the welding cover plate of the heat pipe end-dissipating end, and the welding cover plate of the heat pipe end-dissipating end is connected to the shell wall through the welding base of the heat pipe end-dissipating end, and is fixed by fasteners.

[0009] A further technical solution of the present invention is that the upper surface of the heat pipe heat absorbing end welding cover plate is completely fitted with the bottom surface of the laser rod welding heat sink to serve as the mounting surface of the gain medium welding component.

[0010] A further technical solution of the present invention is: the heat pipe is a U-shaped structure, forming an overall U-shaped heat pipe assembly, the bottom end of the U-shaped structure is buried in the heat pipe heat absorbing end welding cover plate, and the two side arms of the U-shaped structure extend from one side of the bracket body where the heat pipe heat absorbing end welding cover plate is installed to its adjacent two sides, and are respectively buried in the heat pipe heat dissipation end welding cover plates located on both sides of the bracket body, and are respectively connected to the inner wall surfaces on both sides of the shell through the heat pipe heat dissipation end welding bases.

[0011] A further technical solution of the present invention is: a plurality of threaded holes are opened on the welding base of the heat pipe heat dissipation end, a plurality of screws pass through the through holes of the shell wall and are tightened in the threaded holes of the welding base of the heat pipe heat dissipation end, and the welding base of the heat pipe heat dissipation end is pulled and connected to the shell wall.

[0012] A further technical solution of the present invention is that the heat pipe heat dissipation end welding cover plate and the heat pipe heat dissipation end welding base are both flat plate structures, and the mounting surfaces are completely fitted.

[0013] A further technical solution of the present invention is that the support body is a cubic frame structure and is installed in the laser sealing cavity by screws.

[0014] A further technical solution of the present invention is: the laser sealed cavity includes a shell and a cavity sealing cover plate encapsulated at its open end, a shell sealing groove is opened on the mounting surface of the shell for installing a cavity sealing gasket, and is used for sealing connection between the shell and the cavity sealing cover plate; a light outlet is opened on the side wall of the shell, and a cavity sealing light window is encapsulated at the light outlet to ensure the transmittance of the laser beam and the sealing of the cavity.

[0015] A heat dissipation method for a laser resonant cavity for enhancing the heat dissipation performance of a gain medium, the specific steps are as follows:

[0016] Install the gain medium welding component in the laser sealed cavity through the resonant cavity bracket;

[0017] A heat pipe assembly is arranged on the resonant cavity bracket, so that the heat absorbing end is connected to the gain medium welding component through a heat pipe heat absorbing end welding cover plate, and the heat dissipating end is connected to the shell of the laser sealed cavity through a heat transfer assembly;

[0018] The shell wall of the laser sealing chamber is tightened and fixed to the heat transfer component by screws;

[0019] The heat generated by the gain medium welding component is successively dissipated through the heat pipe heat absorbing end welding cover, the heat pipe assembly, the heat transfer assembly, and the shell to complete the heat dissipation of the gain medium laser rod.

[0020] Beneficial Effects

[0021] The beneficial effect of the present invention is that the present invention provides a laser resonant cavity with enhanced heat dissipation performance of the gain medium. Compared with the traditional laser resonant cavity bracket, the present invention has the ability to quickly extract the heat of the gain medium through the internal welded heat pipe, which will significantly improve the heat dissipation performance of the laser gain medium and effectively improve the laser beam quality of the laser. The specific advantages are as follows:

[0022] 1. The buried welding method of the heat pipe of the present invention improves the heat dissipation capacity of the resonant cavity bracket and can quickly conduct the heat of the gain medium welding components in a small space;

[0023] 2. The present invention adopts a long U-shaped heat pipe assembly, which can further quickly conduct the heat on the resonant cavity bracket outward through the two wings of the heat pipe group. The long U-shaped heat pipe group has a certain flexibility, which will reduce the impact of its two wings on the resonant cavity bracket when pulled by external force;

[0024] 3. The configuration design of the present invention can ensure the sealing of the laser sealed cavity while ensuring the improvement of heat dissipation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional schematic diagram of a laser resonant cavity for enhancing the heat dissipation performance of a gain medium in an embodiment of the present invention;

[0026] Figure 2 A three-dimensional cross-sectional schematic diagram of a laser resonant cavity for enhancing the heat dissipation performance of a gain medium in an embodiment of the present invention;

[0027] Figure 3 A three-dimensional schematic diagram of a resonant cavity support and a gain medium welding component in an embodiment of the present invention;

[0028] Figure 4 It is a cross-sectional view of the resonant cavity support and gain medium welding components in an embodiment of the present invention.

[0029] Explanation of the reference numerals: 1. Laser sealed cavity, 2. Resonant cavity bracket, 3. Gain medium welding component; 11. Cavity sealing cover plate, 12. Shell, 13. Cavity sealing light window, 14. Cavity sealing gasket; 21. Bracket body, 22. Heat pipe, 23. Heat pipe heat absorption end welding cover plate, 24. Heat pipe heat dissipation end welding cover plate, 25. Heat pipe heat dissipation end welding base; 31. Laser rod welding heat sink, 32. Gain medium laser rod. DETAILED DESCRIPTION

[0030] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] Based on the prior art, the gain medium component is directly installed on the laser sealed shell or the resonant cavity bracket. This method is difficult to solve the heat dissipation problem of the gain medium when facing higher energy requirements. Poor heat dissipation of the gain medium will cause a series of problems such as laser beam spot deterioration, large energy fluctuation, and energy decline. The present invention provides a laser resonant cavity with enhanced heat dissipation performance of the gain medium, including a laser sealed cavity and a gain medium welding component installed therein, the gain medium welding component is fixed in the laser sealed cavity through a resonant cavity bracket; the resonant cavity bracket includes a bracket body and a heat pipe assembly installed thereon, the heat absorbing end of the heat pipe assembly is connected to the gain medium welding component, and the heat dissipating end is connected to the shell of the laser sealed cavity through a heat transfer assembly; the heat generated by the gain medium welding component is sequentially transferred to the heat transfer assembly and the shell through the heat pipe assembly to complete the heat dissipation of the gain medium.

[0033] Specifically, the gain medium welding component includes a gain medium laser rod and a laser rod welding heat sink, and the gain medium laser rod is welded to a side surface of the laser rod welding heat sink.

[0034] Specifically, the heat pipe assembly is composed of a plurality of heat pipes arranged in parallel, the middle portion of the heat pipe assembly is embedded in a welding cover plate at the heat pipe end, and the welding cover plate at the heat pipe end is in contact with the other side surface of the laser rod welding heat sink, so that the heat pipe assembly is located directly below the gain medium welding component; both ends of the heat pipe assembly extend toward the shell wall respectively and are embedded in a welding cover plate at the heat pipe end, and the welding cover plate at the heat pipe end is connected to the shell wall through a welding base at the heat pipe end, and is fixed by fasteners.

[0035] Specifically, the upper surface of the welding cover plate at the heat pipe end is completely fitted with the bottom surface of the laser rod welding heat sink, serving as the mounting surface of the gain medium welding component.

[0036] Specifically, the heat pipe is a U-shaped structure, forming an overall U-shaped heat pipe assembly, the bottom end of the U-shaped structure is buried in the welding cover plate of the heat pipe heat absorbing end, and the two side arms of the U-shaped structure extend from one side of the welding cover plate of the heat pipe heat absorbing end installed on the bracket body to its adjacent two sides, and are respectively buried in the welding cover plates of the heat pipe heat dissipating ends located on both sides of the bracket body, and are respectively connected to the inner wall surfaces on both sides of the shell through the welding bases of the heat pipe heat dissipating ends.

[0037] Specifically, a plurality of threaded holes are opened on the welding base of the heat pipe cooling end, and a plurality of screws penetrate through holes on the shell wall and are tightened in the threaded holes of the welding base of the heat pipe cooling end to pull the welding base of the heat pipe cooling end to the shell wall.

[0038] Specifically, the heat pipe heat dissipation end welding cover plate and the heat pipe heat dissipation end welding base are both flat plate structures, and the mounting surfaces are completely fitted.

[0039] Specifically, the support body is a cubic frame structure and is installed in the laser sealing cavity by screws.

[0040] Specifically, the laser sealed cavity includes a shell and a cavity sealing cover plate encapsulated at the open end thereof, a shell sealing groove is opened on the mounting surface of the shell for installing a cavity sealing gasket, and is used for sealing connection between the shell and the cavity sealing cover plate; a light outlet is opened on the side wall of the shell, and a cavity sealing light window is encapsulated at the light outlet to ensure the transmittance of the laser beam and the sealing of the cavity.

[0041] The present invention provides a heat dissipation method for a laser resonant cavity for enhancing the heat dissipation performance of a gain medium, and the specific steps are as follows:

[0042] Step 1: Install the gain medium welding component in the laser sealed cavity through the resonant cavity bracket;

[0043] Step 2: placing a heat pipe assembly on the resonant cavity bracket, so that the heat absorbing end is connected to the gain medium welding component through the heat absorbing end welding cover of the heat pipe, and the heat dissipation end is connected to the shell of the laser sealed cavity through the heat transfer assembly;

[0044] Step 3: Tighten and fix the shell wall of the laser sealing cavity to the heat transfer component through screws;

[0045] Step 4: The heat generated by the gain medium welding components passes through the heat pipe heat absorption end welding cover, heat pipe assembly, heat transfer assembly, and shell in sequence to complete the heat dissipation of the gain medium laser rod.

[0046] By adopting the above method, the heat generated by the gain medium during operation can be quickly transferred to the resonant cavity bracket, the shell and the sealed cavity cover, thereby enhancing the heat dissipation performance of the gain medium.

[0047] The above technical solution is further described below in conjunction with the accompanying drawings:

[0048] Reference Figure 1 As shown, the present embodiment is a laser resonant cavity configuration design for enhancing the heat dissipation performance of the gain medium. The design includes a laser sealed cavity 1, a resonant cavity bracket 2, and a gain medium welding component 3.

[0049] The laser sealed cavity 1 comprises a shell 12, a cavity sealing gasket 14, a cavity sealing cover plate 11 and a sealed light window 13; the shell 12 is a rectangular cavity structure, and is provided with a mounting hole for the resonant cavity bracket 2. The resonant cavity bracket 2 is installed in the shell 12. The cavity sealing gasket 14 is installed in the shell sealing groove, and is pressed by the cavity sealing cover plate 11 to ensure sealing. The sealed light window 13 is installed at the light outlet of the shell 12, and is fastened and sealed by gluing to ensure its tightness and the sealing of the sealed cavity.

[0050] Reference Figure 2 As shown, the gain medium welding component 3 includes a gain medium laser rod 32 and a laser rod welding heat sink 21, and the gain medium laser rod 32 is welded on the laser rod welding heat sink 31. The gain medium welding component 3 is mounted on the resonant cavity bracket 2.

[0051] Reference Figure 2-4 As shown, the resonant cavity bracket includes a bracket body 21, a heat pipe 22, a heat pipe heat absorbing end welding cover plate 23, a heat dissipation end welding cover plate 24 and a heat dissipation end welding base 25. A group of long U-shaped heat pipes 22 are buried and welded below the mounting position of the gain medium welding component 3 on the resonant cavity bracket 2, and a heat pipe heat absorbing end welding cover plate 23 is welded on the heat pipe 22. The upper surface of the heat pipe heat absorbing end welding cover plate 23 is ensured to be flush with the mounting surface of the gain medium welding component 3 by machining; the heat dissipation end welding cover plate 24 and the heat dissipation end welding base 25 are welded on the two wings of the long U-shaped heat pipe 22 respectively, and the heat dissipation end welding base 25 faces the outside of the resonant cavity bracket 2 and is punched with threaded holes. The heat dissipation end welding bases 25 of the two wings are pulled and connected to the bottom surface of the upper shell 12 and the cavity sealing cover plate 11 by screws, so that the heat generated by the gain medium during operation can be quickly transferred to the resonant cavity bracket, the shell and the sealing cavity cover plate, thereby enhancing the heat dissipation performance of the gain medium.

[0052] The housing 12 is used to install other components and provide a sealed space;

[0053] The cavity sealing gasket 14 is installed in the sealing groove of the housing 12 and is used to seal the cavity;

[0054] The cavity sealing cover plate 11 is used to compress the cavity sealing gasket 14 to create a sealed space;

[0055] The cavity sealing light window 13 is used to ensure the laser beam passes through and seal the cavity;

[0056] The laser rod welding heat sink 31 is used to carry the gain medium laser rod 32, and the gain medium laser rod 32 is welded in the circular groove of the laser rod welding heat sink 31;

[0057] The support body 21 is used to carry the gain medium welding components, provide a carrying space for the heat pipe 22, and is finally installed in the housing 12;

[0058] The heat pipe 22 is used to enhance heat conduction and is welded to the support body 21 and is located below the installation position of the gain medium welding component 3;

[0059] The heat pipe heat absorbing end welding cover plate 23 is welded to the upper part of the heat pipe 22, and is machined to ensure that the upper surface is flush with the mounting surface of the gain medium welding component, serving as a part of the mounting surface of the gain medium welding component;

[0060] The heat pipe heat dissipation end welding cover plate 24 and the heat pipe heat dissipation end welding base 25 are welded to the two wings of the long U-shaped heat pipe 22, and the heat pipe heat dissipation end welding base 25 faces the outside of the bracket body 21 and has a threaded hole;

[0061] Through holes are opened at corresponding positions on the ground of the shell 12 and the cavity sealing cover 11, and screws are used to pull the welding base 25 of the heat pipe heat dissipation end of the resonant cavity bracket 2 to connect the bottom surface of the shell 12 and the cavity side of the cavity sealing cover 11 to connect the sealed cavity 1, the resonant cavity bracket 2 and the gain medium welding component 3 together.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A laser resonant cavity with enhanced heat dissipation performance of a gain medium, characterized in that: It includes a laser sealed cavity and a gain medium welding component installed therein, wherein the gain medium welding component is fixed in the laser sealed cavity through a resonant cavity bracket; The resonant cavity bracket includes a bracket body and a heat pipe assembly installed thereon, the heat absorbing end of the heat pipe assembly is connected to the gain medium welding component, and the heat dissipating end is connected to the shell of the laser sealed cavity through a heat transfer assembly; the heat generated by the gain medium welding component is transferred to the heat transfer assembly and the shell in sequence through the heat pipe assembly to complete the heat dissipation of the gain medium.

2. A laser resonant cavity with enhanced heat dissipation performance of a gain medium according to claim 1, characterized in that: The gain medium welding component comprises a gain medium laser rod and a laser rod welding heat sink, and the gain medium laser rod is welded to a side surface of the laser rod welding heat sink.

3. A laser resonant cavity with enhanced heat dissipation performance of a gain medium according to claim 2, characterized in that: The heat pipe assembly is composed of a plurality of heat pipes arranged in parallel, the middle portion of the heat pipe assembly is embedded in a welding cover plate at the heat pipe end, and the welding cover plate at the heat pipe end is in contact with the other side surface of the laser rod welding heat sink, so that the heat pipe assembly is located directly below the gain medium welding component; both ends of the heat pipe assembly extend toward the shell wall respectively and are embedded in a welding cover plate at the heat pipe end, and the welding cover plate at the heat pipe end is connected to the shell wall through a welding base at the heat pipe end, and is fixed by fasteners.

4. A laser resonant cavity with enhanced heat dissipation performance of a gain medium according to claim 3, characterized in that: The upper surface of the heat pipe heat absorbing end welding cover plate is completely in contact with the bottom surface of the laser rod welding heat sink, serving as the mounting surface of the gain medium welding component.

5. A laser resonant cavity with enhanced heat dissipation performance of a gain medium according to claim 4, characterized in that: The heat pipe is a U-shaped structure, forming an overall U-shaped heat pipe assembly, the bottom end of the U-shaped structure is buried in the heat pipe heat absorbing end welding cover plate, and the two side arms of the U-shaped structure extend from one side of the support body where the heat pipe heat absorbing end welding cover plate is installed to its adjacent two sides, and are respectively buried in the heat pipe heat dissipation end welding cover plates located on both sides of the support body, and are respectively connected to the inner wall surfaces on both sides of the shell through the heat pipe heat dissipation end welding bases.

6. A laser resonant cavity with enhanced heat dissipation performance of a gain medium according to claim 5, characterized in that: The heat pipe heat dissipation end welding base is provided with a plurality of threaded holes, and a plurality of screws penetrate through holes on the shell wall and are screwed into the threaded holes on the heat pipe heat dissipation end welding base to pull the heat pipe heat dissipation end welding base to the shell wall.

7. A laser resonant cavity with enhanced heat dissipation performance of gain medium according to claim 6, characterized in that: The heat pipe heat dissipation end welding cover plate and the heat pipe heat dissipation end welding base are both flat plate structures, and the mounting surfaces are completely fitted.

8. A laser resonant cavity with enhanced heat dissipation performance of a gain medium according to claim 7, characterized in that: The support body is a cubic frame structure and is installed in the laser sealing cavity by screws.

9. A laser resonant cavity with enhanced heat dissipation performance of a gain medium according to claim 8, characterized in that: The laser sealed cavity includes a shell and a cavity sealing cover plate encapsulated at its open end. A shell sealing groove is provided on the mounting surface of the shell for installing a cavity sealing gasket and for sealing the connection between the shell and the cavity sealing cover plate. A light outlet is provided on the side wall of the shell, and a cavity sealing light window is encapsulated at the light outlet to ensure the transmittance of the laser beam and the sealing of the cavity.

10. A heat dissipation method for a laser resonant cavity with enhanced heat dissipation performance of a gain medium according to any one of claims 1 to 9, characterized in that The specific steps are as follows: Install the gain medium welding component in the laser sealed cavity through the resonant cavity bracket; A heat pipe assembly is arranged on the resonant cavity bracket, so that the heat absorbing end is connected to the gain medium welding component through a heat pipe heat absorbing end welding cover plate, and the heat dissipating end is connected to the shell of the laser sealed cavity through a heat transfer assembly; The shell wall of the laser sealing chamber is tightened and fixed to the heat transfer component by screws; The heat generated by the gain medium welding component is successively dissipated through the heat pipe heat absorbing end welding cover, the heat pipe assembly, the heat transfer assembly, and the shell to complete the heat dissipation of the gain medium laser rod.

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