High power 976 nm single mode all fiber laser

Abstract

The application belongs to the technical field of laser equipment, and particularly relates to a high-power 976nm single-mode all-fiber laser. The technology comprises a shell, the left end of the shell is provided with an end cover, a pump source is arranged in the shell, a water-cooling plate is fixed in the shell, an installation groove which can accommodate the bottom of the pump source and is arranged in an inclined manner is formed in the water-cooling plate, a hole for connecting the installation grooves is formed in the groove wall of the installation groove, and a water-cooling assembly is arranged in the water-cooling plate. A forced air cooling mechanism is arranged on one side of the water-cooling plate, a fiber power combiner is arranged in the shell, and an output port is arranged on the shell. The bottom of the pump source is arranged in the inclined installation groove, the contact area between the pump source and the water-cooling plate is increased, the cooling effect is good, the hole in the groove wall of the installation groove is used for connecting the installation grooves, when silicone grease is applied, the excess silicone grease can flow into other installation grooves, the processing time is reduced when too much silicone grease is applied, the heat conductivity is increased by the through hole and the silicone grease in the through hole, and the heat dissipation effect is enhanced.

Description

Technical Field

[0001] This invention belongs to the field of laser equipment technology, and in particular relates to a high-power 976nm single-mode all-fiber laser. Background Technology

[0002] The high-power 976nm single-mode all-fiber laser is a single-mode all-fiber laser system based on a 976nm wavelength. Its main characteristics include high output power, high stability, and excellent beam quality. This laser is primarily used in materials processing, including laser cutting, laser welding, laser cladding, and laser brazing. Furthermore, it is widely used in processing highly reflective materials, such as aluminum alloy welding, exhibiting extremely strong resistance to high reflectivity. Its high power and excellent beam quality make it outstanding in industrial applications, meeting the stringent reliability and stability requirements of industrial users.

[0003] Lasers mainly consist of gain media, pump source, resonant cavity, cooling system, control system, and output system. When installing the cooling system, silicone grease is applied to the cooling plate that cools the pump source to increase thermal conductivity and enhance heat dissipation. The amount of silicone grease applied is also required. Applying too much silicone grease will affect other components, while applying too little will affect the heat dissipation of the pump source. Therefore, the application of silicone grease to the cooling plate in existing lasers requires experienced personnel to control the amount. Summary of the Invention

[0004] The purpose of this invention is to provide a high-power 976nm single-mode all-fiber laser that is easy to apply silicone grease and can enhance the thermal conductivity of water-cooled plates.

[0005] The high-power 976nm single-mode all-fiber laser includes a horizontally arranged housing with an end cap at the left end. Multiple pump sources are independently arranged in a matrix inside the housing. A water-cooled plate for mounting the pump sources is horizontally fixed inside the housing. The pump sources are all inclined with the left side higher than the right side. The water-cooled plate has an inclined mounting groove for the bottom of the pump source to be inserted. The groove wall has several holes that connect the mounting grooves. The interior of the water-cooled plate is equipped with a water-cooling component for cooling.

[0006] A wind-cooling mechanism is installed on one side of the water-cooled plate, and an optical fiber power combiner is installed inside the housing below the water-cooled plate. The housing is equipped with an output port for laser output.

[0007] The pump source provides energy to excite the gain medium to generate laser light. The fiber power combiner combines the generated laser light into a more powerful laser beam. The bottom of the pump source is placed in the inclined mounting slot, with part of the right side wall also located within the slot, increasing the contact area between the pump source and the water-cooling plate, resulting in better cooling. Through the holes on the mounting slot wall, when applying silicone grease to the wall of one mounting slot, excess grease can flow into other mounting slots, preventing the need for time-consuming processing when applying too much. At the same time, the through holes and the silicone grease inside them increase thermal conductivity, thereby enhancing the heat dissipation effect. Combined with the water-cooling components inside the water-cooling plate, the heat dissipation effect is further enhanced. The air-cooling mechanism not only increases internal heat dissipation but also prevents condensation inside the housing.

[0008] Furthermore, the water-cooling assembly includes cooling water pipes, which are arranged in a serpentine structure within the water-cooling plate.

[0009] The serpentine distribution of the cooling water pipes provides good cooling performance.

[0010] Furthermore, the water-cooled plate consists of two plates arranged vertically, which are the first cooling plate and the second cooling plate from top to bottom;

[0011] The first cooling plate includes a first water-cooled plate, and the mounting groove includes a first mounting groove formed on the first water-cooled plate;

[0012] The second cooling plate includes a second water-cooled plate that is detachably connected to the first water-cooled plate. The top of the second water-cooled plate is provided with a first water pipe groove for installing a cooling water pipe. Corresponding to the first water pipe groove, a second water pipe groove is provided at the bottom of the first water-cooled plate. The first water pipe groove and the second water pipe groove together form a space that embraces the cooling water pipe.

[0013] The first and second water-cooled plates, which can be detachably connected, together form a water-cooled plate, which facilitates the installation and maintenance of the internal cooling water pipes.

[0014] Furthermore, the bottom opening of the first mounting groove corresponds to the second mounting groove on the second water-cooling plate, which has a second mounting groove.

[0015] The first mounting slot and the second mounting slot together form the mounting slot for mounting the pump source. By separating the mounting slots into the first mounting slot and the second mounting slot, the distance between the cooling water pipe between the first water-cooled plate and the second water-cooled plate and the pump source is brought closer, thereby enhancing the cooling effect on the pump source.

[0016] Furthermore, the air-cooling mechanism is a crossflow fan.

[0017] Crossflow fans can both increase heat dissipation and prevent condensation inside the casing.

[0018] Furthermore, a heat sink is provided inside the housing above the pump source.

[0019] The heat sink is used to further transfer heat and enhance the heat dissipation effect.

[0020] Furthermore, a circulating water pump is installed inside the housing, and the circulating water pump is connected to inlet and outlet copper blocks. The inlet and outlet copper blocks are provided with ports for connecting to the inlet and outlet ends of the cooling water pipe.

[0021] The inlet and outlet copper block has two inlets and two outlets, including a first inlet and a first outlet connected to it, and a second inlet and a second outlet connected to it. The first inlet is connected to the outlet of the circulating water pump, the first outlet is connected to the inlet end of the chilled water pipe, the second inlet is connected to the outlet end of the chilled water pipe, and the second outlet is connected to the refrigeration equipment. Through the circulating water pump and the inlet and outlet copper block, a circulating water cooling system is formed between the liquid in the chilled water pipe and the external refrigeration equipment. The inlet and outlet copper block facilitates the connection and matching of the chilled water pipe and the circulating water pump.

[0022] Furthermore, a coil is connected to the bottom of the second water-cooled plate.

[0023] Beam coils are used to enhance laser signals.

[0024] Furthermore, the hole located on the wall of the first mounting groove is a horizontally arranged circular through hole.

[0025] Circular through holes are easy to process and facilitate the flow of silicone grease.

[0026] Furthermore, both the first and second cooling plates are made of copper.

[0027] Copper has good thermal conductivity.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The pump source is placed at the bottom of the inclined mounting slot, with part of the right side wall also located within the slot. This increases the contact area between the pump source and the water-cooling plate, resulting in better cooling. Through the holes on the mounting slot wall that connect to the other mounting slots, excess silicone grease can flow into other mounting slots when applying it to one slot, preventing the need for time-consuming processing when too much grease is applied. At the same time, the through holes and the silicone grease inside them increase thermal conductivity, thereby enhancing the heat dissipation effect. Combined with the water-cooling components inside the water-cooling plate, this further increases the heat dissipation effect. The air-cooling mechanism not only increases internal heat dissipation but also prevents condensation inside the casing. Attached Figure Description

[0030] Figure 1 A front view of a high-power 976nm single-mode all-fiber laser;

[0031] Figure 2 forFigure 1 The left view;

[0032] Figure 3 for Figure 1 Top view after removing the casing and heat sink;

[0033] Figure 4 yes Figure 1 A schematic diagram of the structure of the first cooling plate in the middle;

[0034] Figure 5 yes Figure 1 A schematic diagram of the structure of the second cooling plate in the middle;

[0035] Figure 6 yes Figure 4 The right view;

[0036] Figure 7 yes Figure 5 The right view;

[0037] Figure 8 yes Figure 4 Top view;

[0038] Figure 9 yes Figure 5 Top view;

[0039] Figure 10 This is a partial cross-sectional view of a high-power 976nm single-mode all-fiber laser.

[0040] Figure 11 This is an exploded schematic diagram of a high-power 976nm single-mode all-fiber laser.

[0041] The components in the diagram are named as follows: 1. Housing; 2. Heat sink; 3. Crossflow fan; 4. First cooling plate; 4.1. First water-cooled plate; 4.2. Circular through hole; 4.3. First mounting slot; 5. Cooling water pipe; 6. Second cooling plate; 6.1. Second water-cooled plate; 6.2. First water pipe groove; 6.3. Second mounting slot; 6.4. Bundle coil; 7. Fiber optic power combiner; 8. Pump source; 9. End cap; 10. Output port; 11. Circulating water pump; 12. Inlet and outlet copper blocks. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0043] Example

[0044] The following materials are used in this embodiment:

[0045] Prepare several pump sources 8. The specific number depends on the parameters of the required laser. In this embodiment, six are used.

[0046] Prepare materials with good thermal conductivity, such as aluminum profiles or copper plates, to make heat dissipation plate 2, first cooling plate 4, and second cooling plate 6;

[0047] Prepare a water pump as a circulating water pump 11;

[0048] Prepare a water inlet and outlet copper block 12. The water inlet and outlet copper block 12 is an existing structure. The water inlet and outlet copper block 12 is an adapter with two water inlets and two water outlets, including a first water inlet and a first water outlet connected thereto, and a second water inlet and a second water outlet connected thereto.

[0049] Prepare a housing 1 and an end cap 9 that fits onto the left end of the housing 1;

[0050] Prepare a crossflow fan 3, preferably a 30 series or 60 series crossflow fan 3. The crossflow fan 3 is a known technology and mainly includes fan blades, motor, housing and mounting bracket.

[0051] Prepare several 6.4mm coils and optical fibers;

[0052] Prepare cooling water pipes 5, preferably made of heat-conducting materials such as copper, aluminum alloy or GH3625 high-temperature alloy.

[0053] The assembly method for the above materials is as follows:

[0054] Step 1: Processing

[0055] Processing the first cooling plate 4 and the second cooling plate 6, such as Figures 4 to 9 As shown, the first cooling plate 4 is manufactured from a first water-cooled plate 4.1; the second cooling plate 6 is manufactured from a second water-cooled plate 6.1. The overall structure of the first water-cooled plate 4.1 and the second water-cooled plate 6.1 is a cuboid structure. The first water-cooled plate 4.1 is as follows... Figure 4 , Figure 6 and Figure 8 As shown, the second water-cooled plate 6.1 Figure 5 , Figure 7 and Figure 9 As shown, the first water-cooled plate 4.1 and the second water-cooled plate 6.1 are the same size and can be aligned and overlapped.

[0056] After aligning and overlapping the first water-cooled plate 4.1 and the second water-cooled plate 6.1, as shown in the figure, an inclined first mounting groove 4.3 is machined on the first water-cooled plate 4.1, and a second mounting groove is machined on the second water-cooled plate 6.1. The bottom of the first mounting groove 4.3 is connected to the second mounting groove from top to bottom, forming a whole, together constituting a mounting groove for mounting the pump source 8.

[0057] like Figure 1As shown, the mounting groove formed by the first mounting groove 4.3 and the second mounting groove is a groove into which the pump source 8 can be placed after being tilted from left to right.

[0058] like Figure 4 and Figure 11 As shown, a circular through hole 4.2 is machined on the wall of the first mounting groove 4.3 to be horizontally connected to other mounting grooves. Whether or not a hole connecting each mounting groove is machined on the wall of the second mounting groove depends on the depth of the second mounting groove. In this embodiment, the second mounting groove is relatively shallow and no hole connecting each mounting groove is machined.

[0059] like Figure 7 and Figure 9 As shown, coil 6.4 is installed on the second water-cooled plate 6.1, as... Figure 1 As shown, the coil 6.4 is located at the bottom of the second water-cooling plate 6.1.

[0060] The top of the second water-cooled plate 6.1 is machined with a first water pipe groove 6.2, and the bottom of the first water-cooled plate 4.1 is machined with a second water pipe groove corresponding to the first water pipe groove 6.2. The first water pipe groove 6.2 and the second water pipe groove form a space that embraces the cooling water pipe 5. Figure 1 As shown, the first water pipe groove 6.2 of the cooling water pipe 5 is located at the bottom of the first mounting groove 4.3 and does not affect the installation of the pump source 8.

[0061] Process heat sink 2, such as Figure 11 As shown, the heat sink 2 has an "n" shaped cross-section and several heat dissipation holes on its wall.

[0062] Step 2: Installation

[0063] The first cooling plate 4 and the second cooling plate 6 are placed horizontally, as follows: Figure 1 and Figure 11 As shown, the cooling water pipe 5 is installed in the first water pipe groove 6.2 and the second water pipe groove between the first cooling plate 4 and the second cooling plate 6. The first cooling plate 4 and the second cooling plate 6 are fixed together with bolts to prevent them from falling off.

[0064] like Figure 3 As shown, the first inlet of the inlet and outlet copper block 12 is connected to the outlet of the circulating water pump 11, the first outlet of the inlet and outlet copper block 12 is connected to the inlet end of the cooling water pipe 5, the second inlet of the inlet and outlet copper block 12 is connected to the outlet end of the cooling water pipe 5, and the second outlet of the inlet and outlet copper block 12 is connected to the circulating water cooling equipment. Through the circulating water pump 11 and the inlet and outlet copper block 12, a circulating water cooling system is formed between the liquid in the cooling water pipe 5 and the external cooling equipment. The inlet and outlet copper block 12 facilitates the connection and matching between the cooling water pipe 5 and the circulating water pump 11.

[0065] The optical fiber is connected to the pump source 8. The optical fiber in the beam coil 6.4 amplifies the laser signal and transmits it to the optical fiber power combiner 7. The optical fiber power combiner 7 is installed at the bottom of the second cooling plate 6. The optical fiber power combiner 7 amplifies the laser beam power and outputs the laser through the output port 10.

[0066] like Figure 1 and Figure 3 As shown, the pump source 8 is installed in the mounting slot. Before installation, apply silicone grease to the mounting slot and then install the pump source 8.

[0067] like Figure 3 As shown, the circulating water pump 11 is installed on the left side of the pump source 8, as... Figure 1 As shown, heat sink 2 is installed above pump source 8.

[0068] The aforementioned components are installed as a whole within housing 1, such as... Figure 1 and Figure 3 As shown, the crossflow fan 3 is installed on the outer wall of the housing 1 on the right side of the first refrigeration plate 4. The structure after installation is as follows. Figure 10 As shown.

[0069] like Figure 2 As shown, the output port 10 is located slightly above the center of the end cover 9, as... Figure 1 and Figure 3 As shown, the end cap 9 is installed on the left end of the housing 1.

[0070] Instructions for use are as follows:

[0071] When installing pump source 8, silicone grease is applied to the bottom of pump source 8 and inside the mounting slot. If too much grease is applied, the excess grease will flow through the circular through-hole 4.2 on the wall of the mounting slot into the next first mounting slot 4.3. When installing the next pump source 8, less silicone grease can be applied. The silicone grease flowing into the circular through-hole 4.2 also plays a role in heat conduction, better transferring or dispersing the heat of pump source 8. Combined with the cooling water pipe 5 for heat dissipation, the heat dissipation effect is good.

[0072] During use, connect the water chiller to the circulating water pump 11 to achieve water cooling circulation. The laser should be installed on a metal platform according to the production environment. Ensure the platform is properly grounded to prevent electromagnetic interference. After completing the above installation steps, necessary debugging and calibration are required to ensure the laser functions correctly. Regular maintenance and inspection are essential to extend the equipment's lifespan.

[0073] This embodiment of a high-power 976nm single-mode all-fiber laser effectively solves the problem of difficulty in controlling the amount of silicone grease applied. Furthermore, the use of the circular through-hole 4.2 and the silicone grease within it not only increases the thermal conductivity of the silicone grease but also enhances heat dissipation. When the crossflow fan 3 is turned on during operation, the temperature difference between the inside and outside of the housing 1 can be exchanged, achieving a constant internal and external temperature effect. This effectively prevents condensation from forming inside the housing 1 due to excessive internal and external temperature differences, which could burn out the optical fiber and other components.

Claims

1. A high-power 976nm single-mode all-fiber laser, comprising a horizontally arranged housing (1), an end cap (9) at the left end of the housing (1), and multiple pump sources (8) independently arranged in a matrix within the housing (1), characterized in that: A water-cooled plate for installing pump sources (8) is horizontally fixed inside the housing (1). The pump sources (8) are all inclined with the left side higher than the right side. A mounting groove for the bottom of the pump source (8) is opened on the water-cooled plate, which is inclined and can be inserted into the pump source (8). Several holes are opened on the groove wall to connect the mounting groove. A water-cooling component for cooling is provided inside the water-cooled plate. A wind-cooling mechanism is installed on one side of the water-cooled plate, and an optical fiber power combiner (7) is installed in the housing (1) below the water-cooled plate. An output port (10) for laser output is provided on the housing (1). The water-cooling assembly includes a cooling water pipe (5), which is arranged in a serpentine structure within the water-cooling plate; The water-cooled plate consists of two plates arranged vertically, namely the first cooling plate (4) and the second cooling plate (6) from top to bottom. The first cooling plate (4) includes a first water cooling plate (4.1), and the mounting groove includes a first mounting groove (4.3) formed on the first water cooling plate (4.1). The second cooling plate (6) includes a second water cooling plate (6.1) that is detachably connected to the first water cooling plate (4.1). The top of the second water cooling plate (6.1) is provided with a first water pipe groove (6.2) for installing the cooling water pipe (5). Corresponding to the first water pipe groove (6.2), a second water pipe groove is provided at the bottom of the first water cooling plate (4.1). The first water pipe groove (6.2) and the second water pipe groove together form a space that embraces the cooling water pipe (5). The bottom opening of the first mounting groove (4.3) corresponds to the second mounting groove (6.3) on the second water-cooled plate (6.1).

2. The high-power 976nm single-mode all-fiber laser according to claim 1, characterized in that: The air-cooling mechanism is a crossflow fan (3).

3. The high-power 976nm single-mode all-fiber laser according to claim 2, characterized in that: A heat sink (2) is provided inside the housing (1) above the pump source (8).

4. The high-power 976nm single-mode all-fiber laser according to claim 3, characterized in that: A circulating water pump (11) is installed inside the housing (1). The circulating water pump (11) is connected to an inlet and outlet copper block (12). The inlet and outlet copper block (12) is provided with an inlet and outlet end connected to the cooling water pipe (5).

5. The high-power 976nm single-mode all-fiber laser according to claim 4, characterized in that: The bottom of the second water-cooled plate (6.1) is connected to a coil (6.4).

6. The high-power 976nm single-mode all-fiber laser according to claim 5, characterized in that: The hole located on the wall of the first mounting groove (4.3) is a horizontally arranged circular through hole (4.2).

7. The high-power 976nm single-mode all-fiber laser according to claim 6, characterized in that: The first cooling plate (4) and the second cooling plate (6) are made of copper.

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