High power fiber laser array

Abstract

A high-power fiber laser array includes a pump module array, a pump fiber array, a resonant cavity module array or a power amplifier module array, and a power transfer fiber array. The pump module array, resonant cavity module array, or power amplifier module array are arranged separately, and connected to each other via the pump fiber array. The fiber laser resonators forming the resonant cavity module array are arranged as closely as possible in a linear array, or the fiber laser amplifiers forming the power amplifier module array are arranged as closely as possible in a linear array, thereby shortening the length of the power transfer fiber between each fiber laser resonator or fiber laser amplifier and the beam combining device. This specification can effectively shorten the length of the power transfer fiber in fiber laser array combining, improving the output power and stability of a single fiber laser oscillator or power amplifier.

Description

Technical Field

[0001] This invention relates primarily to the field of high-power laser technology, and in particular to a high-power fiber laser array. Background Technology

[0002] Fiber lasers have gained popularity in industry, scientific research, and medical fields due to their advantages such as good beam quality, high conversion efficiency, and ease of use, and have broad development prospects. However, due to various nonlinear effects, material damage, and other physical factors, the output power of a single fiber laser is still limited. In order to obtain higher output power, beam combining technology is commonly used.

[0003] Currently, a commonly used beam combining scheme is as follows: Figure 1 As shown, high-power fiber laser oscillators / amplifiers are stacked together in an array, and the output laser is transmitted to the beam combiner via a power transmission fiber. Because a single high-power fiber laser oscillator / amplifier is currently quite large, the array size is large when combining a large number of beams. High-power fiber laser oscillators / amplifiers located at the array edges require long power transmission fibers to reach the beam combiner; this length can sometimes reach several meters. However, the length of the power transmission fiber significantly affects the threshold values ​​of stimulated Raman effect (mainly in broadband single-mode fiber lasers) or stimulated Brillouin effect (mainly in single-frequency or ultra-narrow linewidth single-mode fiber lasers) in the high-power fiber laser oscillator / amplifier. The longer the power transmission fiber, the lower the threshold values ​​of these two nonlinear effects, and the lower the output power of the laser.

[0004] Therefore, there is an urgent need for a technical solution that can effectively shorten the length of the power transmission fiber of a high-power fiber laser oscillator / amplifier and increase the output power of a single high-power fiber laser oscillator / amplifier without changing the size of the high-power fiber laser oscillator / amplifier array. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention proposes a high-power fiber laser array.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A high-power fiber laser array can be either a high-power fiber laser oscillator array or a high-power fiber laser amplifier array.

[0008] Specifically, the high-power fiber laser array includes:

[0009] The pump module array includes M×N pump modules arranged in an array. The pump module array has N layers, each layer has M pump modules, and each pump module includes multiple semiconductor lasers.

[0010] Pump fiber array, comprising M×N pump fibers;

[0011] The resonant cavity module array or power amplifier module array is connected to the pump module array via a pump fiber array. The resonant cavity module array comprises N layers of resonant cavity modules, each layer containing M fiber laser resonant cavities. The M×N fiber laser resonant cavities forming the resonant cavity module array are arranged as closely as possible in a linear array. The power amplifier module array comprises N layers of power amplifier modules, each layer containing M fiber laser amplifiers. The M×N fiber laser amplifiers forming the power amplifier module array are arranged as closely as possible in a linear array.

[0012] A power transmission fiber array, comprising M×N power transmission fibers, is connected to a resonant cavity module array or a power amplifier module array to output laser light.

[0013] Furthermore, in this invention, the resonant cavity module array or power amplifier module array is connected to the beam combining device via a power transfer fiber array. For a high-power fiber laser oscillator array, the M×N fiber laser resonant cavities constituting the resonant cavity module array are arranged as closely as possible in a linear array, thereby shortening the length of the power transfer fiber between each fiber laser resonant cavity and the beam combining device. For a high-power fiber laser power amplifier array, the M×N fiber laser amplifiers constituting the power amplifier module array are arranged as closely as possible in a linear array, thereby shortening the length of the power transfer fiber between each fiber laser amplifier and the beam combining device.

[0014] The high-power fiber laser array is a high-power fiber laser oscillator array, including a resonant cavity module array. The gain fibers of each fiber laser resonator in the resonant cavity module array are arranged in a parallel linear array or a linear array racetrack-like coiled arrangement. Further, the resonant cavity module also includes a heat sink, and each fiber laser resonator in the resonant cavity module is mounted on the heat sink. Further, the fiber laser resonator includes a fiber pump combiner, a high-reflection fiber grating, a gain fiber, a low-reflection fiber grating, and a cladding optical filter. Multiple pump arms of the fiber pump combiner are connected to their corresponding pump fibers via fusion splices. The combined output fiber of the fiber pump combiner is connected to the high-reflection fiber grating via fusion splice. A gain fiber is fused between the high-reflection fiber grating and the low-reflection fiber grating. The other end of the low-reflection fiber grating is connected to the cladding optical filter, and the other end of the cladding optical filter is connected to the power transmission fiber.

[0015] The high-power fiber laser array is a high-power fiber laser amplifier array, including a power amplification module array. The gain fibers of each fiber laser amplifier in the power amplification module array are arranged in a parallel linear array or a linear array coiled in a racetrack pattern. Further, the power amplification module also includes a heat sink, and each fiber laser amplifier in the power amplification module is mounted on the heat sink. The high-power fiber laser amplifier array also includes a seed source laser and a fiber beam splitter. The seed source laser is connected to the input end of the fiber beam splitter, which has M×N output ends. Each output end of the fiber beam splitter is connected to the signal input end of a corresponding fiber laser amplifier via a signal fiber. Furthermore, the fiber laser amplifier includes a fiber pump combiner, a gain fiber, and a cladding optical filter. The fiber pump combiner is an (N+1)×1 type fiber pump combiner with one signal arm, N pump arms, and a combining output end. The signal fiber is connected to the signal arm of the fiber pump combiner. The N pump arms of the fiber pump combiner are respectively connected to the corresponding pump fibers. The combining output end of the fiber pump combiner is connected to one end of the gain fiber. The other end of the gain fiber is connected to the cladding optical filter. The other end of the cladding optical filter is connected to the power transmission fiber.

[0016] Furthermore, in the high-power fiber laser array, the pump module also includes a chassis and a heat sink and a driving power supply encapsulated within the chassis, with the semiconductor laser mounted on the heat sink; the driving power supply is a constant current source module used to provide power to the semiconductor laser.

[0017] Furthermore, the semiconductor laser described in this invention is a fiber-coupled semiconductor laser.

[0018] Furthermore, the pump fiber described in this invention is the output pigtail of an optical fiber coupled semiconductor laser.

[0019] Furthermore, the heat sink described in this invention is a water-cooled heat sink, an air-cooled heat sink, or a phase change cold storage heat sink.

[0020] Compared with the prior art, the technical effects of the present invention are as follows:

[0021] Since the length of the power transmission fiber affects the output power of the fiber laser oscillator / amplifier, the shorter the power transmission fiber, the better. However, the fiber length between the pump module and the fiber laser resonator / amplifier is independent of the output power of the high-power fiber laser oscillator / amplifier and can be of any length.

[0022] Based on this, the present invention, through the above-described scheme, for a high-power fiber laser oscillator array, separates the pump module array and the resonant cavity module array, connecting them via a pump fiber array. Each pump fiber in the pump fiber array has a different length, minimizing the distance between the output end of the fiber laser resonator connected to each pump fiber and the beam combining device, thereby minimizing the length of each power transmission fiber connecting each fiber laser resonator to the beam combining device. The M×N fiber laser resonators constituting the resonant cavity module array are arranged as closely as possible in a linear array, further shortening the length of the power transmission fiber between each fiber laser resonator and the beam combining device.

[0023] For high-power fiber laser amplifier arrays, the seed source laser and fiber beam splitter, pump module array, and power amplifier module array are set up separately. The pump module array and power amplifier module array are connected by a pump fiber array. Each pump fiber in the pump fiber array has a different length, so that the distance between the output end of the fiber laser amplifier connected to each pump fiber and the beam combining device is as short as possible, thereby minimizing the length of each power transmission fiber connecting each fiber laser amplifier to the beam combining device. The M×N fiber laser amplifiers that make up the power amplifier module array are arranged as closely as possible in a linear array, further shortening the length of the power transmission fiber between each fiber laser amplifier and the beam combining device.

[0024] This achieves the goal of effectively shortening the length of the power transmission fiber and increasing the output power of a single high-power fiber laser oscillator or power amplifier without changing the size of the high-power fiber laser array. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic block diagram of the structure of a high-power fiber laser array in the prior art;

[0027] Figure 2 This is a schematic diagram of the structure of a high-power fiber laser oscillator array beam combining device provided in one embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the fiber laser resonator used in one embodiment of the present invention;

[0029] Figure 4 This is a diagram showing the winding method of the gain fiber in one embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of a high-power fiber laser amplifier array beam combining device provided in one embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the fiber laser amplifier used in one embodiment of the present invention;

[0032] Label Explanation:

[0033] 100. Pump module array; 101. Pump module;

[0034] 200. Pump fiber array; 201. Pump fiber;

[0035] 300, Resonant cavity module array; 301, Fiber laser resonant cavity; 3011, First fiber pump combiner; 3012, High-reflectivity fiber grating; 3013, First gain fiber; 3014, Low-reflectivity fiber grating; 3015, First cladding optical filter; 302, First heat sink;

[0036] 400, Power transmission fiber array; 401, Power transmission fiber;

[0037] 500. Beam combining device;

[0038] 600. Seed source laser;

[0039] 700. Fiber optic bundle splitter; 701. Signal fiber optic cable;

[0040] 800, Power amplifier module array; 801, Fiber laser amplifier; 8011, Second fiber pump combiner; 8012, Second gain fiber; 8013, Second cladding optical filter; 802, Second heat sink. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the spirit of the disclosed content will be clearly explained below with reference to the accompanying drawings and detailed description. Any person skilled in the art, after understanding the embodiments of the present invention, can make changes and modifications based on the techniques taught in the present invention without departing from the spirit and scope of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0042] This invention provides a high-power fiber laser array, which can be a high-power fiber laser oscillator array or a high-power fiber laser amplifier array, including...

[0043] The pump module array includes M×N pump modules arranged in an array. The pump module array has N layers, each layer has M pump modules, and each pump module includes multiple semiconductor lasers.

[0044] Pump fiber array, comprising M×N pump fibers;

[0045] The resonant cavity module array or power amplifier module array is connected to the pump module array via a pump fiber array. The resonant cavity module array comprises N layers of resonant cavity modules, each layer containing M fiber laser resonant cavities. The M×N fiber laser resonant cavities forming the resonant cavity module array are arranged as closely as possible in a linear array. The power amplifier module array comprises N layers of power amplifier modules, each layer containing M fiber laser amplifiers. The M×N fiber laser amplifiers forming the power amplifier module array are arranged as closely as possible in a linear array.

[0046] A power transmission fiber array, comprising M×N power transmission fibers, is connected to a resonant cavity module array or a power amplifier module array to output laser light.

[0047] The resonant cavity module array or power amplifier module array is connected to the beam combining device via a power transfer fiber array. For a high-power fiber laser oscillator array, the M×N fiber laser resonators that make up the resonant cavity module array are arranged as closely as possible in a linear array, thereby shortening the length of the power transfer fiber between each fiber laser resonator and the beam combining device. For a high-power fiber laser oscillator array, the M×N fiber laser amplifiers that make up the power amplifier module array are arranged as closely as possible in a linear array, thereby shortening the length of the power transfer fiber between each fiber laser amplifier and the beam combining device.

[0048] Reference Figure 2 In one embodiment of the present invention, a high-power fiber laser array is provided, which is a high-power fiber laser oscillator array, including a pump module array 100, a pump fiber array 200, a resonant cavity module array 300, a power transmission fiber array 400, and a beam combining device 500.

[0049] The pump module array 100 and the resonant cavity module array 300 are connected via a pump fiber array 200, and the resonant cavity module array 300 is connected to the beam combining device 500 via a power transfer fiber array 400. Each pump fiber in the pump fiber array 200 has a different length, minimizing the distance between the output end of each fiber laser resonator in the resonant cavity module array 300 connected to each pump fiber and the beam combining device, thereby minimizing the length of each power transfer fiber connecting each fiber laser resonator to the beam combining device.

[0050] The specific length of the power transmission fiber 401 is determined according to the actual application requirements. In this invention, the M×N fiber laser resonators 301 that make up the resonator module array 300 are arranged as closely as possible in a linear array, thereby shortening the length of the power transmission fiber between each fiber laser resonator 301 and the beam combining device 500.

[0051] Reference Figure 2 In one embodiment: the pump module array 100 includes M×N pump modules 101 arranged in an array. The pump module array 100 has N layers, each layer has M pump modules 101, and each pump module 101 includes multiple semiconductor lasers.

[0052] Pump fiber array 200, comprising M×N pump fibers 201;

[0053] The resonant cavity module array 300 includes N layers of resonant cavity modules, each layer of resonant cavity module containing M fiber laser resonant cavities 301; the M×N fiber laser resonant cavities 301 that make up the resonant cavity module array 300 are arranged together as closely as possible in a linear array.

[0054] The m-th pump module 101 in the n-th layer of the pump module array 100 corresponds to the m-th fiber laser resonant cavity 301 in the n-th layer of the resonant cavity module array 300, where n = 1, 2, ..., N and m = 1, 2, ..., M. Each semiconductor laser in each pump module 101 is connected to the corresponding fiber laser resonant cavity 301 through a pump fiber 201.

[0055] Each pump fiber 201 in the pump fiber array 200 has a different length, so that the distance between the output end of the fiber laser resonator 301 connected to each pump fiber 201 and the beam combining device 500 is as short as possible.

[0056] The power transmission fiber array 400 includes M×N power transmission fibers 401, and the output end of each fiber laser resonator 301 is connected to the beam combining device 500 through the power transmission fiber 401.

[0057] In one embodiment, the pump module 101 mainly consists of a chassis and several fiber-coupled semiconductor lasers, a heat sink, and a driving power supply encapsulated within the chassis. The pump module 101 is primarily used to provide suitable pump power to the fiber laser oscillator. The semiconductor lasers in the pump module 101 are commercially available fiber-coupled semiconductor lasers, and their number, output power, pigtail type, and other parameters are determined based on the actual situation of the lasers. The semiconductor lasers are mounted on the heat sink; the structure and cooling method of the heat sink are not limited, and water-cooled, air-cooled, or phase-change energy storage heat sinks can be used, as these technologies are relatively mature. The driving power supply can be a commercial constant current source module, used to provide suitable power to the semiconductor lasers, and its specific parameters are matched with the power supply parameters of the semiconductor lasers.

[0058] In one embodiment, the pump fiber 201 can be the output pigtail of a fiber-coupled semiconductor laser.

[0059] To ensure stable operation of the resonant cavity module, in a preferred embodiment, the resonant cavity module further includes a first heat sink 302, on which each fiber laser resonant cavity 301 in the resonant cavity module is mounted. The structure and cooling method of the first heat sink 302 are not limited; it can be a water-cooled heat sink, an air-cooled heat sink, or a phase-change cold storage heat sink, and the relevant technologies are relatively mature.

[0060] The structure of the fiber laser resonator described in this invention is not limited. (See reference...) Figure 3 In a preferred embodiment of the present invention, the fiber laser resonator 301 includes a first fiber pump combiner 3011, a high-reflectivity fiber grating 3012, a first gain fiber 3013, a low-reflectivity fiber grating 3014, and a first cladding optical filter 3015. Multiple pump arms of the first fiber pump combiner 3011 are respectively connected to corresponding pump fibers 201 via fusion splices. The combined output fiber of the first fiber pump combiner 3011 is connected to the high-reflectivity fiber grating 3012 via fusion splices. The first gain fiber 3013 is fused between the high-reflectivity fiber grating 3012 and the low-reflectivity fiber grating 3014. The other end of the low-reflectivity fiber grating 3014 is connected to the first cladding optical filter 3015. The other end of the first cladding optical filter 3015 is connected to the beam combining device 500 via a power transmission fiber 401.

[0061] In the prior art, there are various other structural forms of fiber laser resonators, but all of them can be arranged into an array using the structure described in this invention to form the resonator module array of this invention. When the length of the fiber laser resonator is short, the first gain fiber 3013 can be... Figure 3 The parallel linear array shown is arranged as follows. When the fiber laser resonator is long, the first gain fiber 3013 can be arranged as shown in the figure. Figure 4The linear array runway-style winding shown is an example; however, the specific form of curved winding is not limited to this. Figure 4 As shown in the diagram. The fiber optic devices described in this invention, such as the fiber optic pump combiner, high-reflection fiber grating, gain fiber, low-reflection fiber grating, and cladding optical filter, can all be commercially available components.

[0062] Reference Figure 5 In one embodiment of the present invention, a high-power fiber laser array is provided, which is a high-power fiber laser amplifier array, including a seed source laser 600, a fiber beam splitter 700, a pump module array 100, a pump fiber array 200, a power amplifier module array 800, a power transfer fiber array 400, and a beam combining device 500. The pump fiber array 200 includes M×N pump fibers 201; the power transfer fiber array 400 includes M×N power transfer fibers 401.

[0063] The pump module array 100 is connected to the power amplifier module array 800 through the pump fiber array 200. Specifically, the m-th pump module 101 in the n-th layer of the pump module array 100 corresponds to the m-th fiber laser amplifier 801 in the n-th layer of the power amplifier module array 800, where n = 1, 2, ..., N and m = 1, 2, ..., M. Each pump module 101 and its corresponding fiber laser amplifier 801 are connected through the corresponding pump fiber 201 in the pump fiber array 200.

[0064] The seed source laser 600 is connected to the fiber optic beam splitter 700. The fiber optic beam splitter 700 splits the laser output from the seed source laser 600 into M×N paths, which are then input to the signal light input terminals of each fiber laser amplifier 801.

[0065] The specific length of the power transmission fiber depends on the actual application requirements. The solution provided by this invention can achieve the shortest possible length of the power transmission fiber.

[0066] The seed source laser 600 is connected to the input end of the fiber optic beam splitter 700, which has M×N output ends.

[0067] The pump module array 100 includes M×N pump modules 101 arranged in an array. The pump module array 100 has N layers, and each layer has M pump modules 101. Each pump module 101 includes multiple semiconductor lasers.

[0068] The power amplifier module array 800 includes N layers of power amplifier modules, each layer of power amplifier modules containing M fiber laser amplifiers 801; the M×N fiber laser amplifiers that make up the power amplifier module array are arranged as closely as possible in a linear array, thereby shortening the length of the power transmission fiber between each fiber laser amplifier and the beam combining device.

[0069] Each output end of the fiber beam splitter 700 is connected to the signal light input end of a fiber laser amplifier 801 via a signal fiber 701. The m-th pump module 101 in the n-th layer of the pump module array 100 corresponds to the m-th fiber laser amplifier 801 in the n-th layer of the power amplifier module array 800, where n = 1, 2, ..., N and m = 1, 2, ..., M. Each semiconductor laser in each pump module 101 is connected to the corresponding fiber laser amplifier 801 via a pump fiber 201. Each pump fiber 201 in the pump fiber array 200 has a different length.

[0070] The output of each fiber laser amplifier 801 is connected to the beam combining device 500 via an energy transmission fiber 401.

[0071] The seed source laser 600 described in this invention can be a commercially available single-frequency or ultra-narrow linewidth single-mode polarization-maintaining fiber laser, and its output laser wavelength and power are determined according to the usage requirements.

[0072] The fiber optic beam splitter 700 can be an all-fiber polarization-maintaining beam splitter. Its input fiber type matches the output fiber of the seed source laser 600, and its output fiber is a polarization-maintaining single-mode fiber. Its operating wavelength covers the output laser wavelength of the seed source laser. The number of output paths and the power tolerance of the fiber optic beam splitter are determined according to the usage requirements. If the number of beams split by a single beam splitter is insufficient, the number can be expanded by cascading.

[0073] In one embodiment, the pump module 101 mainly consists of a chassis and several fiber-coupled semiconductor lasers, a heat sink, and a driving power supply encapsulated within the chassis. The pump module 101 is primarily used to provide suitable pump power to the fiber laser amplifier. The semiconductor lasers in the pump module 101 are commercially available fiber-coupled semiconductor lasers, and their number, output power, pigtail type, and other parameters are determined based on the actual situation of the lasers. The semiconductor lasers are mounted on the heat sink; the structure and cooling method of the heat sink are not limited, and water-cooled, air-cooled, or phase-change energy storage heat sinks can be used, as these technologies are relatively mature. The driving power supply can be a commercial constant current source module, used to provide suitable power to the semiconductor lasers, and its specific parameters are matched with the power supply parameters of the semiconductor lasers.

[0074] In one embodiment, the pump fiber 201 can be the output pigtail of a fiber-coupled semiconductor laser.

[0075] To ensure stable operation of the power amplifier module, in a preferred embodiment, the power amplifier module further includes a second heat sink 802, on which each fiber laser amplifier 801 in the power amplifier module is mounted. The structure and cooling method of the second heat sink 802 are not limited; it can be a water-cooled heat sink, an air-cooled heat sink, or a phase-change thermal storage heat sink, and related technologies are relatively mature.

[0076] The structure of the fiber laser amplifier 801 described in this invention is not limited. (See reference...) Figure 6 In a preferred embodiment of the present invention, the fiber laser amplifier 801 includes a second fiber pump combiner 8011, a second gain fiber 8012, and a second cladding optical filter 8013. The second fiber pump combiner 8011 is an (N+1)×1 type fiber pump combiner, having one signal arm, N pump arms, and a combining output end. The signal fiber 701 is connected to the signal arm of the second fiber pump combiner 8011. The N pump arms of the second fiber pump combiner 8011 are respectively connected to the corresponding pump fibers 201. The combining output end of the second fiber pump combiner 8011 is connected to one end of the second gain fiber 8012. The other end of the second gain fiber 8012 is connected to the second cladding optical filter 8013. The other end of the second cladding optical filter 8013 serves as a power transmission fiber 401 connected to the beam combining device 500. The power transmission fiber 401 is the output pigtail of the fiber laser amplifier 801.

[0077] In the prior art, fiber laser amplifiers 801 have various other structural forms, but all can be arranged into an array using the structure described in this invention to form the power amplification module array of this invention. When the gain fiber in the fiber laser amplifier is short, the second gain fiber 8012 can be... Figure 3 The parallel linear array shown can be arranged in a similar manner. When the second gain fiber 8012 in the fiber laser amplifier is relatively long, it can be arranged as shown in the example. Figure 4 The linear array runway-style winding shown is an example; however, the specific form of curved winding is not limited to this. Figure 4 As shown in the diagram. The various fiber optic components in the fiber laser amplifier 801 of this invention, including but not limited to fiber pump combiners, gain fibers, and cladding filters, can all be commercially available devices, and the fiber optic components are connected by fusion splicing.

[0078] Matters not covered in this invention are common knowledge.

[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A high power fiber laser array, characterized in that, include: The pump module array includes M×N pump modules arranged in an array. The pump module array has N layers, each layer has M pump modules, and each pump module includes multiple semiconductor lasers. Pump fiber array, comprising M×N pump fibers; The resonant cavity module array or power amplifier module array is connected to the resonant cavity module array or power amplifier module array via a pump fiber array. The resonant cavity module array or power amplifier module array is connected to the beam combining device via a power transfer fiber array. Each pump fiber in the pump fiber array has a different length, so that the distance between the output end of the fiber laser resonant cavity connected to each pump fiber and the beam combining device is as short as possible, thereby minimizing the length of each power transfer fiber connecting each fiber laser resonant cavity to the beam combining device. The resonant cavity module array includes N layers of resonant cavity modules, each layer containing M fiber laser resonant cavities. The M×N fiber laser resonant cavities forming the resonant cavity module array are arranged as closely as possible in a linear array. The power amplifier module array includes N layers of power amplifier modules, each layer containing M fiber laser amplifiers. The M×N fiber laser amplifiers forming the power amplifier module array are arranged as closely as possible in a linear array. A power transmission fiber array, comprising M×N power transmission fibers, with a resonant cavity module array or a power amplifier module array connected to the power transmission fiber array to output laser; Without changing the size of the high-power fiber laser array, the output power of a single high-power fiber laser oscillator or power amplifier can be increased by shortening the length of the power transmission fiber.

2. The high power fiber laser array of claim 1, wherein, It includes a resonant cavity module array, wherein the gain fibers of each fiber laser resonant cavity in the resonant cavity module array are arranged in a parallel linear array or in a linear array racetrack-style coiling arrangement.

3. The high power fiber laser array of claim 2, wherein, The resonant cavity module also includes a heat sink, and each fiber laser resonant cavity in the resonant cavity module is mounted on the heat sink.

4. The high power fiber laser array of claim 2, wherein, The fiber laser resonant cavity includes a fiber pump combiner, a high-reflectivity fiber grating, a gain fiber, a low-reflectivity fiber grating, and a cladding optical filter. Multiple pump arms of the fiber pump combiner are connected to their corresponding pump fibers via fusion splices. The combined output fiber of the fiber pump combiner is connected to the high-reflectivity fiber grating via fusion splices. A gain fiber is fused between the high-reflectivity fiber grating and the low-reflectivity fiber grating. The other end of the low-reflectivity fiber grating is connected to the cladding optical filter, and the other end of the cladding optical filter is connected to the power transmission fiber.

5. The high power fiber laser array of claim 1, wherein, It includes a power amplifier module array, wherein the gain fibers of each fiber laser amplifier in the power amplifier module array are arranged in a parallel linear array or in a linear array racetrack-style coiled arrangement.

6. The high power fiber laser array of claim 5, wherein, The power amplifier module also includes a heat sink, and each fiber laser amplifier in the power amplifier module is mounted on the heat sink.

7. The high-power fiber laser array according to claim 5, characterized in that, It also includes a seed source laser and a fiber beam splitter. The seed source laser is connected to the input end of the fiber beam splitter. The fiber beam splitter has M×N output ends. Each output end of the fiber beam splitter is connected to the signal light input end of a fiber laser amplifier through a signal fiber.

8. The high-power fiber laser array according to claim 7, characterized in that, The fiber laser amplifier includes a fiber pump combiner, a gain fiber, and a cladding optical filter. The fiber pump combiner is an (N+1)×1 type fiber pump combiner with one signal arm, N pump arms, and a combining output end. The signal fiber is connected to the signal arm of the fiber pump combiner. The N pump arms of the fiber pump combiner are respectively connected to the corresponding pump fibers. The combining output end of the fiber pump combiner is connected to one end of the gain fiber. The other end of the gain fiber is connected to the cladding optical filter. The other end of the cladding optical filter is connected to the power transmission fiber.

9. The high-power fiber laser array according to any one of claims 1 to 8, characterized in that, The pump module also includes a chassis and a heat sink and a driving power supply encapsulated within the chassis. The semiconductor laser is mounted on the heat sink. The driving power supply is a constant current source module used to provide power to the semiconductor laser.

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