3000W laser

Abstract

The 3000W laser comprises a pumping source and a cooling device which are arranged at the bottom of an optical fiber layer, the optical fiber layer comprises an optical fiber water-cooling plate, a cover plate arranged 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 sources comprise high-brightness multi-mode semiconductor laser arrays, the pumping sources comprise two groups, each group comprises a plurality of high-brightness multi-mode semiconductor laser arrays, and the pumping sources are arranged on a pumping source cold water plate. Compared with the prior art, the problems that an existing 3000W laser is low in energy conversion efficiency and poor in light beam quality can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of optoelectronic equipment manufacturing, in particular to a 3000W high-power optical fiber laser. Background Art

[0002] 3000W high-power fiber lasers are widely used in many fields such as metal cutting, welding, marking, surface treatment, material science research, military directed energy weapons, medical laser treatment, etc., especially in industries with extremely high requirements for processing accuracy and efficiency.

[0003] With the rapid development of industrial processing, military applications, medical technology and scientific research, the demand for high-power fiber lasers is growing. Existing high-power lasers include pump sources, fiber layers, optical resonators, optical isolators, cooling devices, etc. Common pump sources include flash lamps, laser diodes, etc. In fiber lasers, pump light is usually coupled into the laser working material through optical fiber to provide energy for the laser working material to generate laser light. The fiber layer is usually a rare earth element-doped optical fiber, which can generate the particle number inversion required for laser light after being excited by the pump light. The optical resonator consists of two mirrors, one of which is almost totally reflective and the other is partially reflective, allowing partial laser output. The function of the resonator is to make photons oscillate back and forth in it, thereby generating strong laser output. Due to the low energy conversion efficiency of the pump sources of light lamps and laser diodes, the poor beam quality of the rare earth element-doped optical fiber, and the complex structure of the cooling device, its application in the field of high-precision and high-efficiency processing 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 become technical problems that need to be solved urgently. Summary of the invention

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

[0005] In order to solve the above problems, the technical solution of the present invention is as follows: the 3000W laser includes a pump source and a cooling device at the bottom of the optical fiber layer, the optical fiber layer includes an optical fiber water-cooling plate and a cover plate on the top, an optical fiber fusion block is provided on the cover plate, an optical fiber disk is provided in the middle of the optical fiber water-cooling plate, a forward beam combiner and a reverse beam combiner are provided on the lateral sides of the optical fiber water-cooling plate, high return gratings are provided on the longitudinal sides of the optical fiber water-cooling plate, a red light emitter is provided on the optical fiber water-cooling plate, the optical fiber of the optical fiber disk is a double-clad gain optical fiber, the double-clad gain optical fiber includes a double-clad rare-earth-doped optical fiber, and the double-clad gain optical fiber includes an inner layer of high-purity quartz glass and an outer layer of a low-refractive-index cladding; The pump source comprises a high-brightness multi-mode semiconductor laser array, the pump source comprises two groups, each group of the pump source comprises a plurality of high-brightness multi-mode semiconductor laser arrays, and the pump source is arranged on a pump source cold water plate; The cooling device includes cold water channels at the bottom of the optical fiber water cooling plate and inside the pump source cold water plate. A water channel block is provided at the edge of the pump source cold water plate and the optical fiber water cooling plate. The water channel block is connected to the cold water channel. A water inlet and a water outlet are provided on the water channel block. The cold water channel passes through the pump source cold water plate at the pump source, and the cold water channel passes through the optical fiber water cooling plate at the optical fiber disk.

[0006] In the above technical solution, a more specific solution may be: a diaphragm pressure sensor is provided on one side of the water channel block.

[0007] Further: an optical fiber winding disk is respectively provided at both longitudinal ends of the forward beam combiner on the optical fiber water cooling plate, and an optical power detector is provided on the optical fiber water cooling plate.

[0008] Further: the optical fiber disc is laid in the optical fiber groove engraved on the optical fiber water cooling plate.

[0009] Furthermore: the cover plate and the optical fiber water cooling plate are hinged via hinges.

[0010] Further: a power supply, two constant current boards and a main control board are arranged side by side on the pump source cold water board, and the cooling water channel passes through the bottom of the pump source cold water board at the power supply.

[0011] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art: 1. This 3000W laser uses a high-brightness multi-mode semiconductor laser array as the pump source. Through a special pump coupling design, it achieves efficient energy coupling into the gain fiber, increasing the pump efficiency to more than 90%; 2. This 3000W laser uses double-clad rare-earth-doped optical fiber with a large mode field area as the gain medium, which effectively alleviates the nonlinear effect, improves the beam quality and enhances the thermal management capability. The inner layer of the optical fiber is high-purity quartz glass, and the outer layer is a low-refractive index cladding, forming a total internal reflection structure; 3. This 3000W laser is designed with an integrated water-cooling system, which is directly attached to the outer layer of the gain fiber. Through the circulation of high thermal conductivity coolant, the heat generated during the laser generation process is quickly taken away to ensure long-term stable operation of the laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is an axonometric diagram of an embodiment of the present invention; Figure 2is an axonometric diagram of an optical fiber layer according to an embodiment of the present invention; Figure 3 is an axonometric view of the optical fiber layer without a cover plate according to an embodiment of the present invention; Figure 4 It is an axonometric diagram of a pump source and a pump source cold water plate according to an embodiment of the present invention; Figure 5 is a cross-sectional view of a cold water channel inside a cold water plate of a pump source according to an embodiment of the present invention; Markings in the figure: optical fiber layer 1, optical fiber water cooling plate 1-1, cover plate 1-2, optical fiber fusion block 1-3, optical fiber winding disk 1-4, hinge 1-5, forward combiner 1-6, optical fiber disk 1-7, high return grating 1-8, optical power detector 1-9, reverse combiner 1-10, red light emitter 1-11, pump layer 2, pump source water cooling 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, cold water channel 7. DETAILED DESCRIPTION

[0013] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings: like Figure 1 The 3000W laser shown includes a pump layer 2 with a pump source at the bottom of the optical fiber layer 1 and a cooling device.

[0014] like Figure 2 , Figure 3 The optical fiber layer 1 shown includes an optical fiber water cooling plate 1-1 and a top cover plate 1-2, on which an optical fiber fusion block 1-3 is provided, an optical fiber disc 1-7 is provided in the middle of the optical fiber water cooling plate 1-1, a forward beam combiner 1-6 and a reverse beam combiner 1-10 are provided on the lateral sides of the optical fiber water cooling plate 1-1, a high return grating 1-8 is provided on the longitudinal sides of the optical fiber water cooling plate 1-1, a red light emitter 1-11 is provided on the optical fiber water cooling plate 1-1, and an optical fiber winding disc 1-4 is provided at each longitudinal end of the forward beam combiner on the optical fiber water cooling plate, and an optical power detector 1-9 is provided on the optical fiber water cooling plate. The optical fiber disc 1-7 is laid in the optical fiber groove engraved on the optical fiber water cooling plate. The cover plate 1-2 is fixed on the optical fiber water cooling plate 1-1 by hinges 1-5 and hexagonal studs to protect the optical fiber. A cold water channel 7 is provided inside the optical fiber water cooling plate 1-1. The optical fiber water cooling plate can be a thick plate with a groove at the bottom, which is sealed by friction welding with a bottom plate. The groove forms a cold water channel inside the optical fiber water cooling plate.

[0015] The optical fiber of the optical fiber disk 1-7 is a double-clad gain optical fiber, which includes a double-clad rare-earth-doped optical fiber, and the double-clad gain optical fiber includes an inner layer of high-purity quartz glass and an outer layer of low-refractive index cladding; the optical fiber water cooling plate 1-1 has a cold water channel passing through it under the optical fiber disk 1-7. The use of double-clad rare-earth-doped optical fiber with a large mode field area as the gain medium effectively alleviates the nonlinear effect, improves the beam quality and enhances the thermal management capability. The optical fiber fusion block 1-3 is fixed to the cover plate 1-2 by screws, and a temperature sensor is installed at the bottom of the cover plate to detect the temperature inside the laser. An optical power detector 1-9 with a PD is designed at the optical fiber QPH to detect the optical power.

[0016] like Figure 4 , Figure 5 As shown, the pump source 2-6 includes a high-brightness multi-mode semiconductor laser array, and the pump source is divided into two groups on the left and right, each group of 6 high-brightness multi-mode semiconductor laser arrays are arranged, and the pump source 2-6 is closely fixed on the bottom surface of a pump source water-cooling plate 2-1, and the bottom of the pump source water-cooling plate 2-1 is designed with a cooling water path passing through each pump source high-brightness multi-mode semiconductor laser to ensure heat dissipation efficiency. The pump source cold water plate 2-1 is provided with a power supply 2-2, two constant current plates, i.e., constant current plate 1 2-3 and constant current plate 2 2-4, and a main control board 2-5 side by side; the pump source cold water plate 2-1 is designed with a cooling water channel inside, and the pump source cold water plate can be a thick plate with a groove at the bottom, which is sealed by friction welding with a bottom plate, and the groove forms a cold water channel inside the pump source cold water plate; the pump source cold water plate 2-1 has a cooling water channel passing under the power supply 2-2. The power supply 2-2 is fixed on the pump source water cooling plate 2-1, close to the cooling water channel surface of the pump source water cooling plate 2-1, to ensure the heat dissipation efficiency; the constant current plate is divided into two pieces, arranged on the pump source water cooling plate, located on the side of the power supply, and respectively controls two groups of pump sources; the control board 2-5 is arranged at the lower right corner of the pump source water cooling plate 2-1, which is convenient for wiring. The cooling device includes a cold water channel 7 provided inside the optical fiber water cooling plate 1-1 and the pump source cold water plate 2-1, and a water channel block 3 is provided at the edge of the pump source cold water plate 2-1 and the optical fiber water cooling plate 1-1. The water channel block 3 is connected to the cold water channel, and a water inlet 4 and a water outlet 5 are provided on the water channel block 3. A diaphragm pressure sensor 6 is provided on one side of the water channel block 3. The water channel block 3 is fastened to the optical fiber water cooling plate 1-1 and the pump source cold water plate 2-1 by screws, and a sealing ring groove is designed to install a sealing ring to prevent water leakage. The water inlet and outlet are divided through the water channel block 3, and the cooling water is introduced into the optical fiber water cooling plate 1-1 and the pump source cold water plate 2-1 for cooling and heat dissipation. The water inlet and outlet are connected to the cooling water pipe of the chiller with a stainless steel pagoda joint; a diaphragm pressure sensor 6 is designed on the water channel block 3 to monitor the water pressure.

[0017] This 3000W laser has achieved remarkable technical results in terms of power enhancement, beam quality optimization, efficiency improvement, stability enhancement, thermal management optimization, modular design, automatic control, environmental protection and energy saving. These innovations not only improve the comprehensive performance of the laser, but also broaden its application areas, injecting new impetus into the development of industrial manufacturing, scientific research, medical health and other fields.

Claims

1. A 3000W laser, comprising a pump source and a cooling device at the bottom of the optical fiber layer, characterized in that: The optical fiber layer includes an optical fiber water cooling plate and a top cover plate, an optical fiber fusion block is provided on the cover plate, an optical fiber disk is provided in the middle of the optical fiber water cooling plate, a forward beam combiner and a reverse beam combiner are provided on the lateral sides of the optical fiber water cooling plate, high return gratings are provided on the longitudinal sides of the optical fiber water cooling plate, a red light emitter is provided on the optical fiber water cooling plate, the optical fiber of the optical fiber disk is a double-clad gain optical fiber, the double-clad gain optical fiber includes a double-clad rare-earth-doped optical fiber, and the double-clad gain optical fiber includes an inner layer of high-purity quartz glass and an outer layer of a low-refractive-index cladding; The pump source comprises a high-brightness multi-mode semiconductor laser array, the pump source comprises two groups, each group of the pump source comprises a plurality of high-brightness multi-mode semiconductor laser arrays, and the pump source is arranged on a pump source cold water plate; The cooling device includes cold water channels at the bottom of the optical fiber water cooling plate and inside the pump source cold water plate. A water channel block is provided at the edge of the pump source cold water plate and the optical fiber water cooling plate. The water channel block is connected to the cold water channel. A water inlet and a water outlet are provided on the water channel block. The cold water channel passes through the pump source cold water plate at the pump source, and the cold water channel passes through the optical fiber water cooling plate at the optical fiber disk.

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

3. The 3000W laser according to claim 1 or 2, characterized in that: An optical fiber winding disk is respectively provided at two longitudinal ends of the forward beam combiner on the optical fiber water cooling plate, and an optical power detector is provided on the optical fiber water cooling plate.

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

5. The 3000W laser according to claim 4, characterized in that: The cover plate and the optical fiber water cooling plate are hinged via hinges.

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

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