Gain optical fiber liquid cooling heat dissipation device

Abstract

The utility model provides a gain optical fiber liquid cooling heat dissipation device which comprises a shell, a fiber inlet assembly and a fiber outlet assembly, a containing cavity used for containing cooling liquid is formed in the shell, a cylinder is arranged in the containing cavity and installed at the bottom of the shell, and a gain optical fiber is wound around the cylinder; the fiber inlet assembly and the fiber outlet assembly are both arranged on the side wall of the shell and communicated with the containing cavity, the fiber inlet welding section of the gain fiber is located in the fiber inlet assembly, and the fiber outlet welding section of the gain fiber is located in the fiber outlet assembly; a first heat conduction sealing part is arranged in the fiber inlet assembly, sealing and heat conduction are carried out on the fiber inlet welding section through the first heat conduction sealing part, a second heat conduction sealing part is arranged in the fiber outlet assembly, and sealing and heat conduction are carried out on the fiber outlet welding section through the second heat conduction sealing part. Therefore, the heat dissipation efficiency of the gain optical fiber is improved while the incoming fiber welding section and the outgoing fiber welding section are prevented from being directly contacted with the cooling liquid, and the failure and performance reduction of the laser caused by over-high temperature of the gain optical fiber are prevented.

Description

Technical Field

[0001] The present application belongs to the technical field of optical fiber lasers, and in particular, relates to a gain optical fiber liquid cooling device. Background Art

[0002] Fiber laser refers to a laser that uses rare earth-doped glass optical fiber as a gain medium. It has the advantages of high conversion efficiency, good beam quality, compact structure and high reliability. It is widely used in optical communications, industrial manufacturing, national defense security, medical equipment and other fields.

[0003] As the output power level of fiber lasers continues to increase, heat dissipation has become a limiting factor that restricts further increases in the output power of fiber lasers, among which the heat dissipation of gain fibers is particularly important. If the temperature of the gain fiber is too high, it will lead to reduced quantum efficiency, changes in the refractive index of the matrix material, and thermal lens effects, which will affect the output power and beam quality of the fiber laser, and may even cause the gain fiber to fuse. Therefore, how to quickly and effectively cool the gain fiber is crucial to improving the performance and stability of fiber lasers.

[0004] Existing gain fiber cooling devices generally use indirect contact conduction cooling to dissipate heat. Usually, the gain fiber is coiled on the surface of a cooling plate or cylinder, and then a large amount of thermal conductive glue is used for packaging. The heat is transferred to the cooling plate or cylinder through the thermal conductive glue, and then the heat is taken away by the cooling medium (such as coolant, air, etc.). This method has a slow heat exchange speed, and the heat cannot be dissipated in time, which may cause the fiber laser to malfunction.

[0005] In response to the above problems, the Chinese patent with patent number CN202122106347.2 discloses encapsulating the gain fiber in a liquid cooling tube so that the gain fiber is in direct contact with the coolant. The coolant keeps flowing to take away the heat of the gain fiber, thereby achieving efficient heat dissipation. However, in the actual production of fiber lasers, the length of the gain fiber is several meters to tens of meters, and the gain fiber needs to be coiled into a closed-loop structure with a diameter of several centimeters to tens of centimeters to control the output efficiency and beam quality. If the device disclosed in this patent is used to cool the gain fiber, a very long liquid cooling tube is required, which is not convenient for integrated installation, and the liquid cooling tube made of stainless steel is difficult to coil into a closed-loop structure with a very small diameter, and its feasibility is low. Utility Model Content

[0006] In view of this, the present application provides a gain optical fiber liquid-cooled heat dissipation device, which enables the gain optical fiber to directly contact the cooling liquid for heat dissipation, and the fiber input fusion section and the fiber output fusion section to indirectly exchange heat with the cooling liquid, thereby improving the heat dissipation efficiency while avoiding direct contact between the fiber input fusion section and the fiber output fusion section and the cooling liquid, and facilitating integration.

[0007] A gain optical fiber liquid cooling device comprises a housing, a fiber input assembly and a fiber output assembly, wherein the housing has a receiving cavity for receiving a cooling liquid, a column is arranged in the receiving cavity, the column is mounted at the bottom of the housing, and a gain optical fiber is wound on the column;

[0008] The fiber-inlet assembly and the fiber-outlet assembly are both arranged on the side wall of the housing and communicated with the accommodating cavity, the fiber-inlet fusion section of the gain optical fiber is located in the fiber-inlet assembly, and the fiber-outlet fusion section of the gain optical fiber is located in the fiber-outlet assembly;

[0009] A first heat-conducting sealing part is provided in the fiber-inlet assembly, through which the fiber-inlet fusion section is sealed and heat-conducted. A second heat-conducting sealing part is provided in the fiber-outlet assembly, through which the fiber-outlet fusion section is sealed and heat-conducted.

[0010] Preferably, the first heat-conductive sealing portion includes a first heat-conductive adhesive filled in the periphery of the fiber-injection fusion section and covering the fiber-injection fusion section and a first sealant filled in both ends of the fiber-injection fusion section, and the first sealant is located outside the first heat-conductive adhesive.

[0011] Preferably, the fiber introduction assembly comprises a fiber introduction tube and a first connecting member, and the fiber introduction tube is installed on the side wall of the housing through the first connecting member and is communicated with the accommodating cavity;

[0012] The fiber-introduction welding section, the first heat-conducting adhesive and the first sealant are all located in the fiber-introduction tube.

[0013] Preferably, a first glue injection port is provided on the fiber entry tube, and the first thermally conductive glue is filled into the fiber entry tube through the first glue injection port; and / or,

[0014] The first connector is provided with a fiber entry sealing groove, in which a sealing strip is provided. When the fiber entry tube is installed on the side wall of the shell through the first connector, the sealing strip in the fiber entry sealing groove abuts against the side wall of the shell.

[0015] Preferably, the second heat-conductive sealing portion includes a second heat-conductive adhesive filled at the periphery of the fiber outlet fusion section and covering the fiber outlet fusion section and a second sealant filled at both ends of the fiber outlet fusion section, and the second sealant is located outside the second heat-conductive adhesive.

[0016] Preferably, the fiber outlet assembly comprises a fiber outlet pipe and a second connecting member, and the fiber outlet pipe is mounted on the side wall of the housing through the second connecting member and communicates with the accommodating cavity;

[0017] The fiber outlet welding section, the second heat conductive adhesive and the second sealant are all located in the fiber outlet tube.

[0018] Preferably, a second glue injection port is provided on the fiber outlet tube, and the second thermally conductive glue is filled into the fiber outlet tube through the second glue injection port; and / or,

[0019] The second connecting member is provided with a fiber outlet sealing groove, in which a sealing strip is provided. When the fiber outlet tube is mounted on the side wall of the shell through the second connecting member, the sealing strip in the fiber outlet sealing groove abuts against the side wall of the shell.

[0020] Preferably, a cover plate is installed on the top of the shell.

[0021] Preferably, a sealing groove is provided at the top of the shell, a sealing strip is provided in the sealing groove, and when the cover plate is installed on the top of the shell, the sealing strip in the sealing groove abuts against the bottom of the cover plate.

[0022] Preferably, a liquid inlet and a liquid outlet are provided on the side wall of the shell.

[0023] The beneficial effects of the present application are as follows: by winding the gain optical fiber on a cylinder placed in a housing cavity and injecting a cooling liquid into the housing cavity, the gain optical fiber is in direct contact with the cooling liquid to dissipate heat, and at the same time, the fiber input fusion section and the fiber output fusion section are respectively accommodated in the fiber input assembly and the fiber output assembly, and the fiber input fusion section and the fiber output fusion section are respectively sealed and heat-conducted by the first heat-conducting sealing part and the second heat-conducting sealing part, so that the fiber input fusion section and the fiber output fusion section indirectly exchange heat with the cooling liquid, which can avoid the fiber input fusion section and the fiber output fusion section from directly contacting the cooling liquid while improving the heat dissipation efficiency of the gain optical fiber, thereby avoiding the failure of the laser and the performance degradation caused by excessive temperature of the fiber input fusion section, the fiber output fusion section and the gain optical fiber, and can ensure that the closed-loop structure formed by winding the gain optical fiber has a suitable bending diameter, thereby maintaining a high conversion efficiency and a good beam quality, and the structure is simple and easy to integrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which this application can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical contents disclosed in this application.

[0026] Figure 1 It is a three-dimensional diagram of the gain optical fiber liquid cooling heat dissipation device;

[0027] Figure 2 It is a front perspective view of the gain optical fiber liquid cooling heat sink;

[0028] Figure 3 It is a top view of the gain optical fiber liquid cooling device;

[0029] Figure 4 A structural diagram of one side wall of a housing of a gain optical fiber liquid cooling device;

[0030] Figure 5 It is a structural diagram of the fiber-entry assembly of the gain optical fiber liquid-cooling heat dissipation device;

[0031] Figure 6 for Figure 5 A longitudinal cross-sectional view of the mid-fiber entry assembly;

[0032] Figure 7 It is a structural diagram of the fiber output assembly of the gain optical fiber liquid cooling heat dissipation device;

[0033] Figure 8 for Figure 7 Longitudinal cross-section of the center fiber outlet assembly.

[0034] In the figure: 1-shell; 11-accommodating chamber; 12-liquid inlet; 13-liquid outlet; 14-first connecting hole; 15-fiber entry hole; 16-second connecting hole; 17-fiber exit hole; 18-third connecting hole; 19-fourth connecting hole; 2-fiber entry assembly; 21-first heat-conducting sealing part; 211-first heat-conducting glue; 212-first sealing glue; 22-fiber entry tube; 221-first glue injection port; 23-first connecting piece; 231-second flange; 232-fifth connecting hole; 233-fiber entry sealing groove; 3-fiber exit assembly ;31-second heat-conductive sealing part;311-second heat-conductive glue;312-second sealing glue;32-fiber outlet tube;321-second glue injection port;33-second connecting piece;331-third flange;332-sixth connecting hole;333-fiber outlet sealing groove;4-column;41-fiber winding column;42-first flange;421-seventh connecting hole;5-gain optical fiber;51-fiber input fusion section;52-fiber output fusion section;6-cover plate;61-eighth connecting hole;7-sealing groove;8-first passive optical fiber;9-second passive optical fiber. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the embodiments in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] like Figure 1-8 As shown, the present application provides a gain optical fiber liquid cooling device, comprising a housing 1, a fiber input assembly 2 and a fiber output assembly 3, wherein the housing 1 has a receiving cavity 11 for receiving a cooling liquid, wherein a column 4 is disposed in the receiving cavity 11, and the column 4 is mounted at the bottom of the housing 1, and a gain optical fiber 5 is wound on the column 4;

[0038] The fiber-inlet assembly 2 and the fiber-outlet assembly 3 are both arranged on the side wall of the housing 1 and communicated with the accommodating cavity 11. The fiber-inlet fusion splicing section 51 of the gain optical fiber 5 is located in the fiber-inlet assembly 2, and the fiber-outlet fusion splicing section 52 of the gain optical fiber 5 is located in the fiber-outlet assembly 3.

[0039] The fiber entry component 2 is provided with a first heat-conducting sealing part 21, through which the fiber entry fusion section 51 is sealed and heat-conducted. The fiber output component 3 is provided with a second heat-conducting sealing part 31, through which the fiber output fusion section 52 is sealed and heat-conducted.

[0040] The utility model winds the gain fiber 5 on the column 4. By designing the shape and size of the column 4, the gain fiber 5 can be wound into a required closed loop structure and obtain the required bending diameter, thereby obtaining a higher conversion efficiency and a better beam quality. At the same time, the gain fiber 5 is directly contacted with the cooling liquid in the accommodating cavity 11, which can accelerate the heat dissipation speed of the gain fiber 5 and improve the heat dissipation efficiency of the gain fiber 5. The fiber input fusion section 51 and the fiber output fusion section 52 are sealed and heat-conducted by the first heat-conducting sealing part 21 and the second heat-conducting sealing part 31 respectively, which can avoid the fiber input fusion section 51 and the fiber output fusion section 52 from being in direct contact with the cooling liquid, and the fiber input fusion section 51 and the fiber output fusion section 52 can be heat-dissipated by indirect heat exchange, thereby avoiding the excessive temperature of the fiber input fusion section 51, the fiber output fusion section 52 and the gain fiber 5, resulting in laser failure and performance degradation.

[0041] Understandably, reference Figure 6 and Figure 8 The fiber input fusion section 51 is the part where the gain fiber 5 is fused with the first passive fiber 8, and the fiber output fusion section 52 is the part where the gain fiber 5 is fused with the second passive fiber 9. Since both the fiber input fusion section 51 and the fiber output fusion section 52 are bare optical fibers, and their exteriors are not coated with a coating layer, waterproof treatment is required to prevent the fiber input fusion section 51 and the fiber output fusion section 52 from directly contacting the cooling liquid. In this application, the fiber input fusion section 51 is sealed in the fiber input assembly 2 with the first heat conductive sealing portion 21, and the fiber output fusion section 52 is sealed in the fiber output assembly 3 with the second heat conductive sealing portion 31, which can effectively prevent the fiber input fusion section 51 and the fiber output fusion section 52 from directly contacting the cooling liquid, and exchange heat with the cooling liquid by indirect heat exchange, so that the fiber input fusion section 51 and the fiber output fusion section 52 dissipate heat.

[0042] like Figure 2 As shown, the column 4 includes a fiber-winding column 41 and a first flange 42. The fiber-winding column 41 is installed on the first flange 42. The gain fiber 5 is wound on the fiber-winding column 41 to form a multi-turn closed-loop structure. The shape and bending diameter of the closed-loop structure formed by the gain fiber 5 are controlled by designing the shape and size of the fiber-winding column 41.

[0043] like Figure 2-3As shown, a plurality of seventh connection holes 421 are provided on the first flange 42, and a plurality of first connection holes 14 corresponding to the seventh connection holes 421 are provided on the bottom of the shell 1. Screws are inserted into each seventh connection hole 421 and the corresponding first connection hole 14, and the first flange 42 is fixedly installed on the bottom of the shell 1 by the screws, thereby installing the fiber winding column 41 on the bottom of the shell 1.

[0044] like Figure 6 As shown, the first heat-conductive sealing part 21 includes a first heat-conductive adhesive 211 filled in the periphery of the fiber-introduction fusion section 51 and covering the fiber-introduction fusion section 51 and a first sealant 212 filled in both ends of the fiber-introduction fusion section 51, and the first sealant 212 is located on the outside of the first heat-conductive adhesive 211.

[0045] The fiber-entry fusion section 51 exchanges heat with the coolant in the accommodating cavity 11 through the first thermally conductive adhesive 211, and the first thermally conductive adhesive 211 can also play a waterproof role to prevent the fiber-entry fusion section 51 from directly contacting the coolant. The first sealant 212 is also filled at both ends of the fiber-entry fusion section 51, and the first sealant 212 is filled on the outside of the first thermally conductive adhesive 211, that is, the first sealant 212 serves as a first waterproof barrier, and the first thermally conductive adhesive 211 serves as a second waterproof barrier.

[0046] like Figure 5-6 As shown, the fiber introduction assembly 2 includes a fiber introduction tube 22 and a first connecting member 23. The fiber introduction tube 22 is installed on the side wall of the housing 1 through the first connecting member 23 and communicates with the accommodating cavity 11.

[0047] The fiber-introduction welding section 51 , the first heat-conducting adhesive 211 , and the first sealant 212 are all located in the fiber-introduction tube 22 .

[0048] A fiber entry sealing groove 233 is provided on the first connecting member 23, and a sealing strip is provided in the fiber entry sealing groove 233. When the fiber entry tube 22 is installed on the side wall of the shell 1 through the first connecting member 23, the sealing strip in the fiber entry sealing groove 233 abuts against the side wall of the shell 1, thereby sealing the accommodating cavity 11 to prevent leakage of cooling liquid.

[0049] The first connecting member 23 includes a second flange 231 . A fiber-entry sealing groove 233 is provided on a side of the second flange 231 close to the housing 1 . A plurality of fifth connecting holes 232 are also provided on the second flange 231 .

[0050] refer to Figure 4A fiber entry hole 15 and a plurality of second connection holes 16 corresponding to the fifth connection holes 232 are provided on one of the side walls of the shell 1. The second connection holes 16 are arranged around the fiber entry hole 15. Screws are inserted into each fifth connection hole 232 and the corresponding second connection hole 16, and the second flange 231 is installed on the side wall of the shell 1 by the screws; when the second flange 231 is installed on the side wall of the shell 1, the sealing strip in the fiber entry sealing groove 233 abuts against the side wall of the shell 1, and one end of the fiber entry tube 22 passes through the second flange 231, and the other end passes through the fiber entry hole 15 and extends into the accommodating cavity 11.

[0051] The gain fiber 5 is evenly coiled on the fiber winding column 41, and a certain length for fusion is reserved at both ends of the gain fiber 5. Then, the two ends of the gain fiber 5 are fused together with the first passive optical fiber 8 and the second passive optical fiber 9 respectively. Then, the gain fiber 5 is continued to be coiled along the fiber winding column 41 until the first passive optical fiber 8 passes through one end of the fiber entry tube 22 located in the accommodating cavity 11, and after passing through the other end of the fiber entry tube 22, the fiber entry fusion section 51 is just located in the fiber entry tube 22.

[0052] Continue to refer Figure 5-6 The fiber entry tube 22 is provided with a first glue injection port 221 , and the first thermally conductive glue 211 is filled into the fiber entry tube 22 through the first glue injection port 221 .

[0053] When the fiber-entry fusion splice section 51 is just placed in the fiber-entry tube 22, the first sealant 212 is injected into both ends of the fiber-entry tube 22, and the two ends of the fiber-entry tube 22 are sealed by the first sealant 212. Subsequently, the first thermally conductive glue 211 is injected into the fiber-entry tube 22 through the first glue injection port 221, so that the space between the fiber-entry fusion splice section 51 and the fiber-entry tube 22 is filled with the first thermally conductive glue 211, which further plays a waterproof role for the fiber-entry fusion splice section 51 and also plays a heat-conducting role, that is, under the action of the first thermally conductive glue 211, the heat of the fiber-entry fusion splice section 51 and the gain optical fiber 5 located in the fiber-entry tube 22 is transferred to the cooling liquid in the accommodating cavity 11 through the first thermally conductive glue 211, and at the same time, the cooling liquid transfers its coldness to the fiber-entry fusion splice section 51 and the gain optical fiber 5 located in the fiber-entry tube 22 through the first thermally conductive glue 211, thereby dissipating the heat of the fiber-entry fusion splice section 51 and the gain optical fiber 5 located in the fiber-entry tube 22.

[0054] like Figure 8 As shown, the second heat-conductive sealing part 31 includes a second heat-conductive adhesive 311 filled in the periphery of the fiber-outlet welding section 52 and covering the fiber-outlet welding section 52 and a second sealant 312 filled in both ends of the fiber-outlet welding section 52, and the second sealant 312 is located on the outside of the second heat-conductive adhesive 311.

[0055] The fiber outlet fusion section 52 exchanges heat with the coolant in the accommodating cavity 11 through the second thermally conductive adhesive 311, and the second thermally conductive adhesive 311 can also play a waterproof role to prevent the fiber outlet fusion section 52 from directly contacting the coolant. The second sealant 312 is also filled at both ends of the fiber outlet fusion section 52, and the second sealant 312 is filled on the outside of the second thermally conductive adhesive 311, that is, the second sealant 312 serves as a first waterproof barrier, and the second thermally conductive adhesive 311 serves as a second waterproof barrier.

[0056] like Figure 7-8 As shown, the fiber outlet assembly 3 includes a fiber outlet pipe 32 and a second connecting member 33. The fiber outlet pipe 32 is installed on the side wall of the housing 1 through the second connecting member 33 and communicates with the accommodating cavity 11.

[0057] The fiber outlet welding section 52 , the second heat conductive adhesive 311 , and the second sealant 312 are all located in the fiber outlet tube 32 .

[0058] A fiber outlet sealing groove 333 is provided on the second connecting member 33, and a sealing strip is provided in the fiber outlet sealing groove 333. When the fiber outlet tube 32 is installed on the side wall of the shell 1 through the second connecting member 33, the sealing strip in the fiber outlet sealing groove 333 abuts against the side wall of the shell 1, thereby sealing the accommodating cavity 11 to prevent leakage of the cooling liquid.

[0059] The second connecting member 33 includes a third flange 331 , and a plurality of sixth connecting holes 332 are defined in the third flange 331 .

[0060] refer to Figure 4 A fiber outlet hole 17 and a plurality of third connection holes 18 corresponding one to one with the sixth connection holes 332 are provided on one of the side walls of the shell 1. The third connection holes 18 are arranged around the fiber outlet hole 17. Preferably, the fiber inlet hole 15, the second connection hole 16, the fiber outlet hole 17 and the third connection holes 18 are all provided on the same side wall of the shell 1.

[0061] Screws are inserted into each sixth connecting hole 332 and the corresponding third connecting hole 18, and the third flange 331 is installed on the side wall of the shell 1 by the screws; when the third flange 331 is installed on the side wall of the shell 1, the sealing strip in the fiber outlet sealing groove 333 abuts against the side wall of the shell 1, and one end of the fiber outlet tube 32 passes through the third flange 331, and the other end passes through the fiber outlet through hole 17 and extends into the accommodating cavity 11.

[0062] The gain optical fiber 5 is evenly coiled on the fiber winding column 41, and a certain length for fusion is reserved at both ends of the gain optical fiber 5. Then, the two ends of the gain optical fiber 5 are fused together with the first passive optical fiber 8 and the second passive optical fiber 9 respectively, and then the gain optical fiber 5 is continued to be coiled along the fiber winding column 41 until the second passive optical fiber 9 passes through one end of the fiber outlet tube 32 located in the accommodating cavity 11, and after passing through the other end of the fiber outlet tube 32, the fiber outlet fusion section 52 is just located in the fiber outlet tube 32, and the fiber input fusion section 51 is just located in the fiber input tube 22.

[0063] Continue to refer Figure 7-8 The fiber outlet tube 32 is provided with a second glue injection port 321 , and the second thermally conductive glue 311 is filled into the fiber outlet tube 32 through the second glue injection port 321 .

[0064] When the fiber outlet fusion splice section 52 is just located in the fiber outlet tube 32, the second sealant 312 is injected into both ends of the fiber outlet tube 32 to seal the two ends of the fiber outlet tube 32 through the second sealant 312, and then the second thermal conductive glue 311 is injected into the fiber outlet tube 32 through the second glue injection port 321, so that the space between the fiber outlet fusion splice section 52 and the fiber outlet tube 32 is filled with the second thermal conductive glue 311, which further plays a waterproof role for the fiber outlet fusion splice section 52 and plays a heat conductive role at the same time, that is, under the action of the second thermal conductive glue 311, the fiber outlet fusion splice section 52 and the gain optical fiber 5 located in the fiber outlet tube 32 exchange heat with the cooling liquid in the accommodating cavity 11, so as to dissipate heat for the fiber outlet fusion splice section 52 and the gain optical fiber 5 located in the fiber outlet tube 32.

[0065] like Figure 1-2 As shown, a cover plate 6 is installed on the top of the shell 1, a sealing groove 7 is opened on the top of the shell 1, and a sealing strip is arranged in the sealing groove 7. When the cover plate 6 is installed on the top of the shell 1, the sealing strip in the sealing groove 7 abuts against the bottom of the cover plate 6.

[0066] A plurality of eighth connection holes 61 are provided on the cover plate 6, and a plurality of fourth connection holes 19 corresponding to the eighth connection holes 61 are provided on the top of the shell 1. Screws are inserted into each of the eighth connection holes 61 and the corresponding fourth connection holes 19. The cover plate 6 is fixedly mounted on the top of the shell 1 by the screws, so that the accommodating cavity 11 in the shell 1 forms a sealed space. The sealing strip in the sealing groove 7 improves the sealing effect between the cover plate 6 and the shell 1 to prevent leakage of the coolant.

[0067] like Figure 1 As shown, a liquid inlet 12 and a liquid outlet 13 are provided on the side wall of the housing 1 .

[0068] In the present embodiment, the gain fiber liquid-cooling heat dissipation device further includes a cooling device (not shown in the figure), and the liquid inlet 12 and the liquid discharge port 13 are both connected to the cooling device. The cooling liquid is cooled by the cooling device, and the low-temperature cooling liquid is transmitted to the accommodating chamber 11 through the liquid inlet 12, and then directly contacts the gain fiber 5 to absorb the heat generated by the gain fiber 5, and indirectly contacts the fiber input fusion section 51, the fiber output fusion section 52, the gain fiber 5 located in the fiber input tube 22, and the gain fiber 5 located in the fiber output tube 32, and absorbs the heat generated by the fiber input fusion section 51, the fiber output fusion section 52, the gain fiber 5 located in the fiber input tube 22, and the gain fiber 5 located in the fiber output tube 32 through the first thermal conductive glue 211 and the second thermal conductive glue 311, and exchanges heat with the cooling liquid in the accommodating chamber 11; then, the cooling liquid heated in the accommodating chamber 11 is transmitted to the cooling device through the liquid discharge port 13 to be cooled, so that the cooling liquid circulates continuously in the cooling device and the accommodating chamber 11.

[0069] In this embodiment, the gain optical fiber 5 is firstly evenly coiled on the fiber winding column 41, and a certain length for fusion is reserved at both ends of the gain optical fiber 5. At this time, the gain optical fiber 5 can be temporarily fixed on the fiber winding column 41 with adhesive tape, and then the light input end of the gain optical fiber 5 is fused with the first passive optical fiber 8 to form a fiber input fusion section 51, and the light output end of the gain optical fiber 5 is fused with the second passive optical fiber 9 to form a fiber output fusion section 52. The adhesive tape is removed, and then the gain optical fiber 5 is continuously coiled along the fiber winding column 41 until the first passive optical fiber 8 passes through the fiber input tube 22 and the fiber input fusion section 51 is just located in the fiber input tube 22, and the second passive optical fiber 9 passes through the fiber output tube 32 and the fiber output fusion section 52 is just located in the fiber output tube 32, and then the fiber winding column 41 is installed at the bottom of the housing 1 through the first flange 42;

[0070] In the process of pulling the first passive optical fiber 8 and the second passive optical fiber 9 out of the accommodation cavity 11, the fiber inlet tube 22 and the fiber outlet tube 32 can be inserted into the accommodation cavity 11 and then the first passive optical fiber 8 and the second passive optical fiber 9 are pulled out of the accommodation cavity 11 through the fiber inlet tube 22 and the fiber outlet tube 32 respectively, or the first passive optical fiber 8 and the second passive optical fiber 9 can be pulled out of the accommodation cavity 11 through the fiber inlet tube 22 and the fiber outlet tube 32 respectively, and then the fiber inlet tube 22 and the fiber outlet tube 32 are inserted into the accommodation cavity 11, that is, fixedly installed on the side wall of the housing 1;

[0071] Then, the two ends of the fiber inlet tube 22 are sealed with the first sealant 212, and the two ends of the fiber outlet tube 32 are sealed with the second sealant 312. Then, the first thermally conductive adhesive 211 is injected into the fiber inlet tube 22 through the first adhesive injection port 221, and the second thermally conductive adhesive 311 is injected into the fiber outlet tube 32 through the second adhesive injection port 321, so that the first thermally conductive adhesive 211 is filled around the fiber inlet fusion section 51, and the second thermally conductive adhesive 311 is filled around the fiber outlet fusion section 52.

[0072] Then, the cover plate 6 is installed on the top of the shell 1 to form a closed space in the accommodating cavity 11. The coolant in the cooling device is transferred to the accommodating cavity 11 through the liquid inlet 12 to cool the gain optical fiber 5. The coolant heated in the accommodating cavity 11 is transferred to the cooling device through the liquid discharge port 13.

[0073] Of course, the fiber winding column 41 can also be installed on the bottom of the shell 1 first, and then the gain optical fiber 5 can be wound on the fiber winding column 41. The present application does not impose any specific restrictions on this, as long as the gain optical fiber 5 can be wound on the fiber winding column 41, and the fiber input fusion section 51 and the fiber output fusion section 52 are respectively located in the fiber input tube 22 and the fiber output tube 32.

[0074] The present application combines direct contact heat exchange and indirect contact heat exchange to dissipate heat for the gain optical fiber 5, the fiber input fusion section 51, and the fiber output fusion section 52, which can improve the heat dissipation efficiency of the gain optical fiber 5 while preventing the fiber input fusion section 51 and the fiber output fusion section 52 from directly contacting the cooling liquid, thereby preventing the gain optical fiber 5, the fiber input fusion section 51, and the fiber output fusion section 52 from overly high temperatures, leading to laser failure and performance degradation; in addition, the present application winds the gain optical fiber 5 on the fiber winding column 41 to ensure that the closed-loop structure formed by the gain optical fiber 5 has a suitable bending diameter, thereby obtaining higher conversion efficiency and better beam quality, and facilitating integration.

[0075] In this specification, each embodiment is described in a progressive, parallel, or progressive and parallel manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0076] It should be noted that in the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation on the present application. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0077] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0078] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gain optical fiber liquid cooling device, characterized in that: The invention comprises a housing (1), a fiber-inlet assembly (2) and a fiber-outlet assembly (3); the housing (1) has a receiving chamber (11) for receiving a cooling liquid; a column (4) is arranged in the receiving chamber (11); the column (4) is mounted at the bottom of the housing (1); and a gain optical fiber (5) is wound around the column (4); The fiber-inlet assembly (2) and the fiber-outlet assembly (3) are both arranged on the side wall of the housing (1) and are in communication with the accommodating cavity (11); the fiber-inlet fusion section (51) of the gain optical fiber (5) is located in the fiber-inlet assembly (2), and the fiber-outlet fusion section (52) of the gain optical fiber (5) is located in the fiber-outlet assembly (3); The fiber input component (2) is provided with a first heat-conducting sealing portion (21), and the fiber input fusion section (51) is sealed and heat-conducted by the first heat-conducting sealing portion (21). The fiber output component (3) is provided with a second heat-conducting sealing portion (31), and the fiber output fusion section (52) is sealed and heat-conducted by the second heat-conducting sealing portion (31).

2. A gain optical fiber liquid cooling device according to claim 1, characterized in that: The first heat-conductive sealing portion (21) comprises a first heat-conductive adhesive (211) filled at the periphery of the fiber-introduction fusion section (51) and covering the fiber-introduction fusion section (51), and a first sealant (212) filled at both ends of the fiber-introduction fusion section (51), wherein the first sealant (212) is located on the outside of the first heat-conductive adhesive (211).

3. A gain optical fiber liquid cooling device according to claim 2, characterized in that: The fiber introduction assembly (2) comprises a fiber introduction tube (22) and a first connecting piece (23); the fiber introduction tube (22) is installed on the side wall of the housing (1) through the first connecting piece (23) and is in communication with the accommodating cavity (11); The fiber introduction welding section (51), the first heat conductive adhesive (211) and the first sealant (212) are all located in the fiber introduction tube (22).

4. A gain optical fiber liquid cooling device according to claim 3, characterized in that: The fiber entry tube (22) is provided with a first glue injection port (221), and the first thermal conductive glue (211) is filled into the fiber entry tube (22) through the first glue injection port (221); and / or, The first connecting member (23) is provided with a fiber entry sealing groove (233), and a sealing strip is provided in the fiber entry sealing groove (233). When the fiber entry tube (22) is installed on the side wall of the shell (1) through the first connecting member (23), the sealing strip in the fiber entry sealing groove (233) abuts against the side wall of the shell (1).

5. The gain optical fiber liquid cooling device according to claim 1, characterized in that: The second heat-conductive sealing portion (31) comprises a second heat-conductive adhesive (311) filled at the periphery of the fiber-outlet fusion section (52) and covering the fiber-outlet fusion section (52), and a second sealant (312) filled at both ends of the fiber-outlet fusion section (52), wherein the second sealant (312) is located on the outside of the second heat-conductive adhesive (311).

6. A gain optical fiber liquid cooling device according to claim 5, characterized in that: The fiber outlet assembly (3) comprises a fiber outlet pipe (32) and a second connecting piece (33); the fiber outlet pipe (32) is mounted on the side wall of the housing (1) via the second connecting piece (33) and is in communication with the accommodating cavity (11); The fiber outlet welding section (52), the second heat conductive adhesive (311) and the second sealant (312) are all located in the fiber outlet tube (32).

7. A gain optical fiber liquid cooling device according to claim 6, characterized in that: The fiber outlet tube (32) is provided with a second glue injection port (321), and the second heat-conducting glue (311) is filled into the fiber outlet tube (32) through the second glue injection port (321) and / or, The second connecting member (33) is provided with a fiber outlet sealing groove (333), and a sealing strip is provided in the fiber outlet sealing groove (333). When the fiber outlet tube (32) is installed on the side wall of the shell (1) through the second connecting member (33), the sealing strip in the fiber outlet sealing groove (333) abuts against the side wall of the shell (1).

8. A gain optical fiber liquid cooling device according to any one of claims 1 to 7, characterized in that: A cover plate (6) is installed on the top of the shell (1).

9. A gain optical fiber liquid cooling device according to claim 8, characterized in that: A sealing groove (7) is provided at the top of the shell (1), and a sealing strip is provided in the sealing groove (7). When the cover plate (6) is installed on the top of the shell (1), the sealing strip in the sealing groove (7) abuts against the bottom of the cover plate (6).

10. A gain optical fiber liquid cooling device according to any one of claims 1 to 7, characterized in that: The side wall of the housing (1) is provided with a liquid inlet (12) and a liquid outlet (13).

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