3000W laser

Abstract

The utility model discloses a 3000W laser, which comprises a pumping source and a cooling device at the bottom of an optical fiber layer, the optical fiber layer comprises an optical fiber water cooling plate, a cover plate at the top of the optical fiber water cooling plate, an optical fiber disc, a forward beam combiner, a reverse beam combiner, a high-return grating and a red light emitter, and optical fibers of the optical fiber disc are double-clad gain optical fibers. The double-cladding gain optical fiber comprises a double-cladding rare earth doped optical fiber, and the double-cladding gain optical fiber comprises high-purity quartz glass on the inner layer and a low-refractive-index cladding on the outer layer. The pumping source comprises a high-brightness multi-mode semiconductor laser array, and the pumping source is arranged on a pumping source cold water plate. Compared with the prior art, the 3000W laser can solve the problems of low energy conversion efficiency and poor light beam quality of the existing 3000W laser.

Description

TECHNICAL FIELD

[0001] The utility model relates to photoelectric equipment manufacturing technical field especially a kind of for 3000W high-power fiber laser. BACKGROUND

[0002] 3000W high-power fiber laser is widely used in metal cutting, welding, marking, surface treatment, material science research, military directional energy weapon, medical laser treatment and multiple fields, especially has remarkable advantage in the industry with extremely high requirement to processing precision and efficiency.

[0003] With the rapid development of industrial processing, military application, medical technology and research field, the demand for high-power fiber laser is increasing. The existing high-power laser includes pump source, fiber layer, optical resonant cavity, optical isolator, cooling device and the like. The common pump source includes flash lamp, laser diode and the like. In the fiber laser, pump light is usually coupled into the laser working substance through optical fiber, and the function is to provide energy for the laser working substance to generate laser. The fiber layer is usually a rare earth element doped fiber, which can produce particle number inversion required for laser after being excited by pump light. The optical resonant cavity is composed of two mirrors, one of which is almost fully reflective, and the other is partially reflective, allowing part of the laser output. The function of the resonant cavity is to make photons oscillate back and forth in it, thereby producing intense laser output. Due to the low energy conversion efficiency of flash lamp and laser diode pump source, the poor beam quality of rare earth element doped fiber, and the complex structure of cooling device, its application in high-precision and high-efficiency processing field is limited. Especially when the output power reaches 3000W and above, how to maintain the stable operation of the laser, improve the beam quality and optimize the cooling device becomes a technical problem to be solved. SUMMARY

[0004] The problem to be solved by the utility model is to provide a 3000W laser to solve the problem of low energy conversion efficiency and poor beam quality of the existing 3000W laser.

[0005] In order to solve the above problems, the technical scheme of the utility model is as follows: the 3000W laser includes pump source and cooling device at the bottom of fiber layer, the fiber layer includes fiber water cooling plate and top cover plate, the cover plate is provided with fiber fusion block, the middle part of the fiber water cooling plate is provided with fiber disc, the transverse two sides of the fiber water cooling plate are respectively provided with forward combiner and reverse combiner, the longitudinal two sides of the fiber water cooling plate are provided with high return grating, the fiber water cooling plate is provided with red light emitter, the fiber of the fiber disc is double-clad gain fiber, the double-clad gain fiber includes double-clad rare earth doped fiber, the double-clad gain fiber includes high-purity quartz glass in the inner layer and low refractive index cladding layer in the outer layer;

[0006] The pump source comprises a high-brightness multi-mode semiconductor laser array, and the pump source is arranged on a pump source cold water plate;

[0007] The cooling device comprises a cold water channel arranged in the pump source cold water plate and the fiber water cooling plate, a water channel block is arranged on the edge of the pump source cold water plate and the fiber water cooling plate, the water channel block is connected with the cold water channel, a water inlet and a water outlet are arranged on the water channel block, the cold water channel passes through the pump source of the pump source cold water plate, and the cold water channel passes through the fiber disc of the fiber water cooling plate.

[0008] In the technical scheme, more specific schemes can be as follows: a diaphragm type pressure sensor is arranged on one side of the water channel block.

[0009] Further, the fiber water cooling plate is provided with a fiber winding disc at each of the longitudinal ends of the forward combiner.

[0010] Further, the fiber disc is arranged in a fiber groove arranged on the fiber water cooling plate.

[0011] Further, the cover plate and the fiber water cooling plate are hingedly connected.

[0012] Further, the pump source cold water plate is provided with a power supply, two constant current plates and a main control plate arranged side by side, and the cooling water channel passes through the power supply at the bottom of the pump source cold water plate.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The 3000W laser adopts a high-brightness multi-mode semiconductor laser array as a pump source, realizes efficient energy coupling into a gain optical fiber through special pump coupling design, and improves the pump efficiency to more than 90%.

[0015] 2. The 3000W laser adopts a large-mode-area double-clad rare earth doped optical fiber as a gain medium, effectively alleviates nonlinear effects, improves beam quality and enhances heat management capability, the inner layer of the optical fiber is high-purity quartz glass, and the outer layer is a low-refractive-index cladding layer, forming a total internal reflection structure.

[0016] 3. The 3000W laser is designed with an integrated water cooling heat dissipation system, directly adheres to the outer layer of the gain optical fiber, circulates cooling liquid with a high thermal conductivity, rapidly removes heat generated in the laser generation process, and ensures long-time stable operation of the laser. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the axonometric view of the embodiment of the utility model.

[0018] Figure 2 This is an isometric view of the fiber optic layer in an embodiment of this utility model;

[0019] Figure 3 This is an isometric view of the fiber optic layer without a cover plate in an embodiment of this utility model;

[0020] Figure 4 This is an isometric view of the pump source and the pump source cooling plate according to an embodiment of this utility model;

[0021] Figure 5 This is a cross-sectional view of the internal cold water channel of the pump source cold water plate in an embodiment of this utility model;

[0022] The diagram shows the following components: Fiber optic layer 1, Fiber optic water-cooled plate 1-1, cover plate 1-2, Fiber optic fusion splice block 1-3, Fiber optic winding disc 1-4, hinge 1-5, forward combiner 1-6, Fiber optic disc 1-7, high-reflection grating 1-8, optical power meter 1-9, reverse combiner 1-10, red light emitter 1-11, pump layer 2, pump source water-cooled plate 2-1, power supply 2-2, constant current plate one 2-3, constant current plate two 2-4, main control board 2-5, pump source 2-6, water channel block 3, water inlet 4, water outlet 5, diaphragm pressure sensor 6, and cold water channel 7. Detailed Implementation

[0023] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0024] like Figure 1 The 3000W laser shown includes a pump layer 2 with a pump source at the bottom of the fiber layer 1 and a cooling device, etc.

[0025] like Figure 2 , Figure 3 The fiber optic layer 1 shown includes a fiber optic water-cooled plate 1-1 and a top cover plate 1-2. The cover plate 1-2 has a fiber optic fusion splice block 1-3. A fiber optic disk 1-7 is located in the center of the fiber optic water-cooled plate 1-1. A forward combiner 1-6 and a reverse combiner 1-10 are respectively located on the two transverse sides of the fiber optic water-cooled plate 1-1. High-reflection gratings 1-8 are located on the two longitudinal sides of the fiber optic water-cooled plate 1-1. A red light emitter 1-11 is located on the fiber optic water-cooled plate 1-1. A fiber optic winding disk 1-4 is located at each end of the forward combiner on the fiber optic water-cooled plate. An optical power meter 1-9 is located on the fiber optic water-cooled plate. The fiber optic disk 1-7 is laid within the fiber optic grooves etched on the fiber optic water-cooled plate. The cover plate 1-2 is fixed above the fiber optic water-cooled plate 1-1 by hinges 1-5 and hexagonal studs, protecting the optical fibers. The fiber optic water-cooled plate 1-1 has a cold water channel 7 inside. The fiber optic water-cooled plate can be a thick plate with a groove on the bottom, which is sealed by friction welding with a base plate. The groove forms a cold water channel inside the fiber optic water-cooled plate.

[0026] The optical fibers in fiber optic trays 1-7 are double-clad gain fibers, comprising double-clad rare-earth-doped fibers. The double-clad gain fiber consists of an inner layer of high-purity quartz glass and an outer layer of low-refractive-index cladding. A water-cooled fiber plate 1-1 has a cooling water channel passing through it below fiber optic trays 1-7. Using large-mode-area double-clad rare-earth-doped fiber as the gain medium effectively mitigates nonlinear effects, improves beam quality, and enhances thermal management capabilities. The fiber optic splice block 1-3 is fixed to the cover plate 1-2 with screws. A temperature sensor is installed at the bottom of the cover plate to detect the internal temperature of the laser. A PD optical power meter 1-9 is designed at the QPH of the optical fiber to detect the optical power.

[0027] like Figure 4 , Figure 5 As shown, the pump source 2-6 includes a high-brightness multimode semiconductor laser array. The pump source is divided into two groups, left and right, with six high-brightness multimode semiconductor laser arrays arranged in each group. The pump source 2-6 is fixedly attached to the bottom surface of a pump source water-cooling plate 2-1. The bottom of the pump source water-cooling plate 2-1 is designed with cooling water channels passing through each high-brightness multimode semiconductor laser to ensure heat dissipation efficiency. A power supply 2-2, two constant current plates (constant current plate one 2-3 and constant current plate two 2-4), and a main control board 2-5 are arranged side-by-side on the pump source water-cooling plate 2-1. The pump source water-cooling plate 2-1 has internal cooling water channels. The pump source water-cooling plate can be a thick plate with grooves on the bottom, sealed with a base plate by friction welding. The grooves form cooling water channels inside the pump source water-cooling plate. Cooling water channels pass through the pump source water-cooling plate 2-1 below the power supply 2-2. The power supply 2-2 is fixed to the pump source water-cooled plate 2-1, closely attached to the surface of the cooling water channel of the pump source water-cooled plate 2-1 to ensure heat dissipation efficiency. Two constant current plates are arranged on the pump source water-cooled plate, located on the side of the power supply, controlling the two sets of pump sources respectively. The control board 2-5 is located at the lower right corner of the pump source water-cooled plate 2-1 for easy wiring. The cooling device includes cooling water channels 7 inside both the fiber optic water-cooled plate 1-1 and the pump source water-cooled plate 2-1. A water channel block 3 is located at the edge of both the pump source water-cooled plate 2-1 and the fiber optic water-cooled plate 1-1, connecting to the cooling water channels. The water channel block 3 has an inlet 4 and an outlet 5, and a diaphragm pressure sensor 6 is located on one side of the water channel block 3. The water channel block 3 is fastened to the fiber optic water-cooled plate 1-1 and the pump source water-cooled plate 2-1 with screws, and a sealing ring groove is designed to install a sealing ring to prevent water leakage. The inlet and outlet are split by water block 3, which guides the cooling water into the fiber optic water-cooled plate 1-1 and the pump source cooling plate 2-1 for cooling and heat dissipation. The inlet and outlet are connected to the cooling water pipe of the chiller by stainless steel pagoda connectors. A diaphragm pressure sensor 6 is designed on water block 3 to monitor water pressure.

[0028] This 3000W laser has achieved significant technical improvements in power enhancement, beam quality optimization, efficiency improvement, stability enhancement, thermal management optimization, modular design, automated control, and environmental protection and energy saving. These innovations not only improve the overall performance of the laser but also broaden its application areas, injecting new impetus into the development of industrial manufacturing, scientific research, and medical health.

Claims

1. A 3000W laser, comprising a pump source and a cooling device at the bottom of an optical fiber layer, characterized in that: The optical fiber layer includes an optical fiber water-cooled plate and a top cover plate. The cover plate is provided with an optical fiber fusion splice block. An optical fiber disk is provided in the middle of the optical fiber water-cooled plate. A forward combiner and a reverse combiner are respectively provided on the two transverse sides of the optical fiber water-cooled plate. A high-reflection grating is provided on the two longitudinal sides of the optical fiber water-cooled plate. A red light emitter is provided on the optical fiber water-cooled plate. The optical fiber of the optical fiber disk is a double-clad gain fiber. The double-clad gain fiber includes a double-clad rare-earth-doped fiber. The double-clad gain fiber includes an inner layer of high-purity quartz glass and an outer layer of low-refractive-index cladding. The pump source includes a high-brightness multimode semiconductor laser array, and the pump source is mounted on a pump source cooling water plate. The cooling device includes cold water channels at the bottom of the fiber optic water-cooled plate and inside the pump source water-cooled plate. A water channel block is provided at the edge of the pump source water-cooled plate and the fiber optic water-cooled plate. The water channel block is connected to the cold water channels. The water channel block is provided with an inlet and an outlet. The pump source water-cooled plate has the cold water channel passing through it at the pump source, and the fiber optic water-cooled plate has the cold water channel passing through it at the fiber optic disc.

2. The 3000W laser according to claim 1, characterized in that: A diaphragm pressure sensor is installed on one side of the water channel block.

3. The 3000W laser according to claim 1 or 2, characterized in that: The optical fiber water-cooled plate has an optical fiber winding disk at each of the longitudinal ends of the forward combiner, and an optical power meter is provided on the optical fiber water-cooled plate.

4. The 3000W laser according to claim 3, characterized in that: The optical fiber disk is laid in the optical fiber groove etched on the optical fiber water-cooling plate.

5. The 3000W laser according to claim 4, characterized in that: The cover plate and the fiber optic water-cooled plate are hinged together.

6. The 3000W laser according to claim 5, characterized in that: The pump source cooling water plate is equipped with a power supply, two constant current plates and a main control board arranged side by side, and a cooling water channel passes through the bottom of the pump source cooling water plate at the power supply.

Images