Multi-channel fiber laser beam combining structure and its assembling method

Abstract

The application particularly relates to a multi-channel fiber laser beam combining structure and a method for assembling and adjusting the same, and solves the technical problem that the prior art is difficult to improve the output power of a laser system. The multi-channel fiber laser beam combining structure comprises a beam combining barrel and a second mounting barrel connected in sequence, N first mounting barrels and a second collimating mirror arranged in the beam combining barrel, and N first collimating mirrors and a fold mirror arranged in the second mounting barrel; the fiber laser is used for emitting laser; the first collimating mirror is used for receiving the emitted laser of the fiber laser and reflecting the emitted laser into the second collimating mirror, and the reflected laser is reflected into the fold mirror after being converged by the second collimating mirror; an outlight port is arranged on the side wall of the beam combining barrel, and the outlight port is located on the reflected light path of the fold mirror and is used for outputting high-power combined light. According to the method, a plurality of fiber lasers can realize the output of kilowatt-level high-power laser, and the power is increased by more than 10 times compared with single-channel laser.

Description

TECHNICAL FIELD

[0001] The present application relates to a multi-channel fiber laser beam combining structure and a method for assembling and adjusting the same. BACKGROUND

[0002] With the continuous development of optical technology, laser systems are increasingly widely used in industrial equipment. In the field of material processing, with the widespread use of special alloys and composite materials, the thickness of the workpiece to be processed increases. In order to ensure the processing efficiency and quality of laser cutting, laser drilling and other processes, higher power laser emitting sources need to be used. In the medical field, in order to reduce damage and bleeding during laser surgery cutting, blood vessel sealing and tissue burning, improve surgical results and reduce recovery time, high-power laser emitting sources also need to be used. In the security field, the rapid and accurate blinding and damaging system of non-cooperative targets also puts forward higher and higher requirements on the power of laser emitting sources.

[0003] In summary, in situations where more power is needed, the power of a single laser is not enough to meet the needs of the laser system. The prior art uses as many lasers as possible for beam combining, but it is difficult to improve the output power of the laser system and it cannot meet the high stability requirements of the optical path arrangement in the laser system. Therefore, a practical and feasible optical and mechanical structure is needed to combine the light emitted by multiple lasers to increase the output power of the laser system. SUMMARY

[0004] The purpose of the present application is to solve the technical problem that the prior art is difficult to improve the output power of the laser system, and a multi-channel fiber laser beam combining structure and a method for assembling and adjusting the same are provided.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A multi-channel fiber laser beam combining structure, characterized in that it comprises a beam combining barrel and a second mounting barrel connected in sequence, N first mounting barrels and a second collimating mirror arranged in the beam combining barrel, and N first collimating mirrors and an axicon mirror arranged in the second mounting barrel; N is an integer greater than or equal to 2;

[0007] A first support barrel is coaxially arranged at one end of the beam combining barrel away from the second mounting barrel, and the first support barrel is used for mounting the second collimating mirror; the N first mounting barrels are uniformly arranged between the first support barrel and the inner wall of the beam combining barrel; a mounting seat is arranged in the first mounting barrel, and the N mounting seats are respectively used for mounting N fiber lasers, and the laser emitting port of the fiber laser faces the second mounting barrel;

[0008] The second installation cylinder is coaxially arranged with a second supporting cylinder, N first collimating mirrors are uniformly embedded between the inner wall of the end of the second installation cylinder away from the beam combining cylinder and the second supporting cylinder, and the N first collimating mirrors are respectively located on the emitting light path of the N fiber lasers; the second collimating mirror is located on the reflected light path of the N first collimating mirrors; the end of the second supporting cylinder close to the beam combining cylinder is used for mounting the fold mirror, and the fold mirror is located on the reflected light path of the second collimating mirror; the light outlet is arranged on the side wall of the beam combining cylinder and located on the reflected light path of the fold mirror;

[0009] The N first collimating mirrors respectively receive the emitted laser of the N fiber lasers, reflect the emitted laser into the second collimating mirror, converge the emitted laser through the second collimating mirror, reflect the emitted laser into the fold mirror, and output the beam combining light after the emitted laser is reflected by the fold mirror.

[0010] Further, the baffles and the plurality of wedge blocks are further included.

[0011] The side wall of the beam combining cylinder and the second installation cylinder is provided with an opening; the baffles are arranged in the opening.

[0012] The outer wall of the first installation cylinder is provided with a slope surface matched with the slope surface of the wedge block, the wedge block is arranged between the outer wall of the first installation cylinder and the beam combining cylinder, and the relative position of each first installation cylinder and the beam combining cylinder is adjusted, so that the center of the light spot of the emitted laser of each fiber laser is coincided.

[0013] Further, the N installation supports arranged between the inner wall of the end of the second installation cylinder away from the beam combining cylinder and the second supporting cylinder, the N installation shafts arranged on the N installation supports, and the adhesive plate, the mirror frame, the compression ring and the plurality of sector-shaped compression plates are further included.

[0014] The N first collimating mirrors are respectively arranged on the N installation shafts.

[0015] The fold mirror is arranged on the second supporting cylinder through the adhesive plate.

[0016] The second collimating mirror is arranged on the end of the first supporting cylinder away from the beam combining cylinder through the mirror frame.

[0017] The compression ring is arranged between the mirror frame and the first supporting cylinder.

[0018] The sector-shaped compression plates are arranged on the end face of the end of the beam combining cylinder away from the second installation cylinder, and are used for compressing the first installation cylinder and the beam combining cylinder.

[0019] Further, the fold mirror is provided with a plurality of layers of dielectric films.

[0020] The distance between the first collimating mirror and the second collimating mirror is 634.3mm.

[0021] Further, N is 12.

[0022] The collimating mirror is an off-axis parabolic mirror, the off-axis amount of which is 99mm, and the off-axis angle is 9.7°.

[0023] The fold mirror is a horseshoe mirror, the reflecting surface of which is an ellipse, the long axis of the reflecting surface is 155.56mm, the short axis of the reflecting surface is 110mm, and the normal line of the reflecting surface forms an angle of 45° with the horizontal plane.

[0024] The second collimating mirror is an aspheric mirror, the aspheric coefficient of which is 0.2468.

[0025] Meanwhile, the application further provides a method for assembling and adjusting the multi-channel optical fiber laser beam combining structure, and the speciality thereof lies in comprising the following steps.

[0026] 1) pre-installing N optical fiber lasers, N mounting seats, N first mounting cylinders, N first collimating mirrors, a second mounting cylinder, a first supporting cylinder and a second collimating mirror; N is an integer greater than or equal to 2;

[0027] 2) opening any one optical fiber laser, adjusting the optical fiber laser so that the emitted laser light is reflected by the first collimating mirror and the second collimating mirror in turn and serves as a reference light beam;

[0028] 3) opening N-1 optical fiber lasers in turn, detecting the position of the laser light spot emitted by the second collimating mirror by using a detector, and finely adjusting the positions of the N-1 optical fiber lasers so that the centers of all the laser light spots coincide with the center position of the light spot of the reference light beam, and then closing the N optical fiber lasers;

[0029] 4) setting the fold mirror on the inner end face of the second supporting cylinder, and installing the second supporting cylinder in the second mounting cylinder, thereby completing the assembly and adjustment of the multi-channel optical fiber laser.

[0030] Further, step 1) is specifically as follows.

[0031] 1.1) firstly, installing the N mounting seats in the N first mounting cylinders respectively, then setting the N optical fiber lasers in the N mounting seats respectively, and then distributing the N first mounting cylinders on the outer end face of one end of the beam combining cylinder; N is an integer greater than or equal to 2;

[0032] 1.2) secondly, installing the N first collimating mirrors on one end of the second mounting cylinder and distributing them along the circumference;

[0033] 1.3) thirdly, setting the second collimating mirror in the middle of the outer end face of one end of the beam combining cylinder through the first supporting cylinder;

[0034] 1.4) finally, connecting the other end of the beam combining cylinder with the other end of the second mounting cylinder, and making the N first collimating mirrors correspond to the positions of the N optical fiber lasers one by one.

[0035] Further, step 2) is specifically as follows.

[0036] Open any one fiber laser, adjust the distance between the first mounting cylinder and the beam combining cylinder through the plurality of wedges, and then adjust the position of the fiber laser, so that the emitted laser light is reflected by the first collimating mirror and the second collimating mirror in turn and then emitted as a reference light beam.

[0037] Further, step 3) is specifically:

[0038] Open N-1 fiber lasers in turn, detect the position of the laser spot emitted by the second collimating mirror by using the detector, adjust the distance between each first mounting cylinder and the beam combining cylinder through the plurality of wedges, and then fine-tune the position of the N-1 fiber lasers, so that the centers of all laser spots coincide with the center position of the spot of the reference light beam; after the position of each fiber laser is adjusted, the corresponding first mounting cylinder is pressed by the sector-shaped pressing plate until all the fiber lasers are fixed and then the N fiber lasers are turned off.

[0039] Further, step 4) is specifically:

[0040] The folded mirror is arranged on the inner end face of the second supporting cylinder by the bonding plate, and the second supporting cylinder is installed in the second mounting cylinder, and the adjustment of the multi-channel fiber laser is completed.

[0041] The beneficial effects of the present application are:

[0042] 1. The present application provides a multi-channel fiber laser beam combining structure, which can use multiple fiber lasers for beam combining, so that the output power rises from kilowatt level to watt level; the multi-channel fiber laser beam combining structure is compact, small in size, can reach 1 cubic meter, easy to adjust, and stable to micron level.

[0043] 2. The multi-channel fiber laser beam combining structure of the present application is provided with a plurality of dielectric films on the reflecting surface of the folded mirror, and the dielectric film makes the folded mirror resistant to high-power laser, and the power density after coating is up to 5000 watts per square centimeter, and the laser reflectivity is not less than 99.5%.

[0044] 3. The multi-channel fiber laser beam combining structure of the present application can adjust the left-right direction and the up-down direction of the first mounting cylinder through the forward and backward movement of the wedge, and then fine-tune the relative position of the first mounting cylinder and the beam combining cylinder, so as to ensure the coincidence degree of 12 laser spots.

[0045] 4, The multi-channel fiber laser beam combining structure adjusting method of the application adopts a plurality of fiber lasers as laser emitting sources, which are evenly distributed in the circumferential direction on the first mounting cylinder, each fiber laser corresponds to a first collimating mirror, the first collimating mirrors are also evenly distributed in the circumferential direction on the second mounting cylinder, the laser emitted by the multi-channel fiber lasers is reflected by the corresponding first collimating mirrors, reaches the reflecting surface of the second collimating mirror, is reflected by the second collimating mirror to become parallel light, and is reflected by the fold mirror to be used as a ten-kilowatt high-power laser source, the power is increased by more than 10 times compared with a single-channel laser. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 The embodiment provided by the application is a three-dimensional schematic view of the multi-channel fiber laser beam combining structure;

[0047] Figure 2 The embodiment provided by the application is a sectional view of the multi-channel fiber laser beam combining structure;

[0048] Figure 3 The embodiment provided by the application is a structural schematic view of the beam combining cylinder;

[0049] Figure 4 The embodiment provided by the application is an installation schematic view of the mounting seat, the wedge block, the first mounting cylinder and the fan-shaped pressing plate;

[0050] Figure 5 The embodiment provided by the application is a sectional view of A-A; Figure 4 The embodiment provided by the application is a sectional view of A-A;

[0051] Figure 6 The embodiment provided by the application is a structural schematic view of the second mounting cylinder.

[0052] BRIEF DESCRIPTION OF DRAWINGS

[0053] 1-fiber laser, 2-mounting seat, 3-wedge block, 4-first mounting cylinder, 5-beam combining cylinder, 51-light outlet, 6-first collimating mirror, 7-mounting shaft, 8-mounting support, 9-second mounting cylinder, 10-second support cylinder, 11-bonding plate, 12-fold mirror, 13-first support cylinder, 14-second collimating mirror, 15-mirror frame, 16-pressing ring, 17-fan-shaped pressing plate, 18-gasket. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0055] AsFigure 1 , Figure 2 As shown, a multi-path fiber laser combining structure includes 12 first mounting cylinders 4, combining cylinders 5, 12 mounting shafts 7, 12 mounting brackets 8, second mounting cylinders 9, second support cylinders 10, adhesive plate 11, lens frame 15, pressure ring 16, fan-shaped pressure plate 17, baffle, and 12 first collimating mirrors 6, second collimating mirrors 14, and folding axis mirrors 12 arranged sequentially along the emitted laser of the fiber laser 1.

[0056] In this embodiment, N is 12. The bundle-combining tube 5 and the second mounting tube 9 are connected in sequence by flanges. Twelve first mounting tubes 4 and second collimating mirrors 14 are arranged inside the bundle-combining tube 5, and twelve first collimating mirrors 6 and folding mirrors 12 are arranged inside the second mounting tube 9.

[0057] A first support cylinder 13 is coaxially arranged at one end of the bundle-combining cylinder 5 away from the second mounting cylinder 9. The first support cylinder 13 is used to install the second collimating lens 14. The second collimating lens 14 is set at the end of the first support cylinder 13 away from the bundle-combining cylinder 5 through a lens frame 15, and the second collimating lens 14 is glued and fixed inside the lens frame 15. The lens frame 15 is fixed on the first support cylinder 13 by a pressure ring 16. The first support cylinder 13 is then connected to the outer end face of one end of the bundle-combining cylinder 5 by screws.

[0058] Twelve first mounting cylinders 4 are evenly arranged circumferentially between the inner walls of the first support cylinder 13 and the bundle-combining cylinder 5; each of the first mounting cylinders 4 is provided with a mounting seat 2, and the twelve mounting seats 2 are used to install twelve fiber lasers 1 respectively. The twelve fiber lasers 1 are inserted and fixed in the twelve mounting seats 2, and the twelve mounting seats 2 are threadedly connected to the twelve first mounting cylinders 4, and the laser emission port of the fiber laser 1 faces the second mounting cylinder 9.

[0059] like Figure 2 , Figure 4 , Figure 5 As shown, the first mounting cylinder 4 extends four mounting lugs, and a gasket 18 is provided between the mounting lugs and the outer end face of the combining cylinder 5; a fan-shaped pressure plate 17 is provided on the outer end face of the combining cylinder 5, and the mounting lugs of the first mounting cylinder 4 are pressed and fixed to the outer end face of the combining cylinder 5 by the fan-shaped pressure plate 17. Four wedges 3 are also provided around the first mounting cylinder 4. The outer wall of the first mounting cylinder 4 is set as an inclined surface that matches the wedges 3 (that is, the surface between adjacent mounting lugs on the outer wall of the first mounting cylinder 4 is an inclined surface). The wedges 3 are located between the outer wall of the first mounting cylinder 4 and the combining cylinder 5. By moving the wedges 3 back and forth, the left and right and up and down directions of the first mounting cylinder 4 can be adjusted, thereby fine-tuning the relative position of the first mounting cylinder 4 and the combining cylinder 5 so that the center of the laser spot emitted by each fiber laser 1 coincides.

[0060] 12 mounting brackets 8 are embedded in the inner wall of the end of the second mounting cylinder 9 away from the beam combining cylinder 5 and between the second supporting cylinder 10, 12 mounting shafts 7 are fixed on the inclined end surface of the mounting bracket 8 by screws, 12 first collimating mirrors 6 are fixed on the 12 mounting shafts 7 by adhesion respectively, and the 12 first collimating mirrors 6 are located on the emitting light path of the 12 fiber lasers 1 respectively; the second collimating mirror 14 is located on the reflected light path of the 12 first collimating mirrors 6.

[0061] The second supporting cylinder 10 is connected to the end of the second mounting cylinder 9 by screws; the fold axis mirror 12 is adhesively fixed on the bonding plate 11, the bonding plate 11 is connected to the end of the second supporting cylinder 10 close to the beam combining cylinder 5 by screws, and the fold axis mirror 12 is located on the reflected light path of the second collimating mirror 14; the light outlet 51 is arranged on the side wall of the beam combining cylinder 5 and located on the reflected light path of the fold axis mirror 12.

[0062] The 12 first collimating mirrors 6 respectively receive the emitted laser of the 12 fiber lasers 1, reflect the emitted laser into the second collimating mirror 14, reflect into the fold axis mirror 12 after converging through the second collimating mirror 14, and output the beam combining light after reflecting through the fold axis mirror 12.

[0063] As shown in Figure 2 , Figure 3 , Figure 6 , the side wall of the beam combining cylinder 5 and the second mounting cylinder 9 are both provided with a hollow; the baffle is arranged in the hollow; the hollow arrangement reduces the weight of the beam combining cylinder 5 and the second mounting cylinder 9, the baffle is a common light shield, which is cheap and saves the cost of valuable materials. The fold axis mirror 12 is provided with multiple layers of dielectric film, which avoids light pollution and improves the laser output efficiency; the distance between the first collimating mirror 6 and the second collimating mirror 14 is 634.3mm, which makes the structure of the present application more compact, and can reach 1 cubic meter. Preferably, the first collimating mirror 6 adopts an off-axis parabolic mirror, the off-axis amount of which is 99mm, and the off-axis angle is 9.7°; the fold axis mirror 12 adopts a horseshoe mirror, the reflecting surface of which is elliptical, the major axis of the reflecting surface is 155.56mm, the minor axis of the reflecting surface is 110mm, and the normal line of the reflecting surface is 45° with the horizontal plane; the second collimating mirror 14 is a non-spherical mirror, and the non-spherical coefficient thereof is 0.2468.

[0064] In this embodiment, the fiber laser 1, the first collimating mirror 6, and the second collimating mirror 14 are first installed at the predetermined position, at this time, the fold axis mirror 12 is not installed, the positions of the 12 laser spots are measured at the other end of the second mounting cylinder 9, the positions of the fiber lasers 1 are finely adjusted to ensure that the centers of the 12 laser spots are coincided, and after adjustment, the fan-shaped pressing plate 17 is used to press and fix the first mounting cylinder 4. Finally, the assembly formed by the fold axis mirror 12, the bonding plate 11, and the second supporting cylinder 10 is installed on the other end surface of the second mounting cylinder 9, which can meet the light output requirements. Preferably, after the multi-channel fiber laser beam combining structure of the present application is installed, as shown inFigure 2 As shown, two shells are used to encapsulate the beam combining tube 5 away from the one end of the second mounting tube 9 and the second mounting tube 9 away from the one end of the beam combining tube 5.

[0065] Meanwhile, the application also provides a kind of based on the above multi-channel fiber laser beam combining structure adjustment method, comprising the following steps:

[0066] 1) pre-install 12 fiber lasers 1, 12 mounting seats 2, 12 first mounting tubes 4, 12 first collimating mirrors 6, second mounting tube 9, first support tube 13 and second collimating mirror 14;

[0067] 1.1 first, 12 mounting seats 2 are uniformly distributed in 12 first mounting tubes 4, then 12 fiber lasers 1 are arranged in mounting seat 2, and then 12 first mounting tubes 4 are uniformly distributed in the outer end face of one end of the beam combining tube 5;

[0068] 1.2 second, first collimating mirror 6 is uniformly distributed along the inner circumference of second mounting tube 9, and first collimating mirror 6 corresponds to fiber laser 1 one by one;

[0069] 1.3 again, second collimating mirror 14 is arranged in the middle of the outer end face of one end of the beam combining tube 5 through first support tube 13;

[0070] 1.4 finally, the other end of the beam combining tube 5 is connected with the one end of the second mounting tube 9.

[0071] 2) open any one fiber laser 1, adjust the distance between first mounting tube 4 and beam combining tube 5 through multiple wedges 3, and then adjust the position of fiber laser 1, so that the emitted laser passes through first collimating mirror 6 and second collimating mirror 14 and is emitted as reference beam.

[0072] 3) open the remaining 11 fiber lasers 1 in turn, detect the position of the laser spot emitted by second collimating mirror 14 using a detector, adjust the distance between first mounting tube 4 and beam combining tube 5 through multiple wedges 3, and then fine-tune the position of 11 fiber lasers 1, so that the centers of all laser spots coincide with the center position of the reference beam spot; after adjusting the position of each fiber laser 1, the corresponding first mounting tube 4 is pressed tightly by sector pressing plate 17, and after the positions of all fiber lasers 1 are fixed, 12 fiber lasers 1 are closed.

[0073] 4) fold axis mirror 12 is arranged on the inner end face of second support tube 10 through adhesive plate 11, and second support tube 10 is installed in second mounting tube 9, and the adjustment of multi-channel fiber laser 1 is completed.

Claims

1. A multi-channel fiber laser beam combining structure, characterized in that: The beam combining structure comprises a combining barrel (5) and a second mounting barrel (9) connected in sequence, N first mounting barrels (4) and a second collimating mirror (14) arranged in the combining barrel (5), and N first collimating mirrors (6) and an axicon mirror (12) arranged in the second mounting barrel (9); N is an integer greater than or equal to 2; A first supporting barrel (13) is coaxially arranged at one end of the combining barrel (5) away from the second mounting barrel (9), and the first supporting barrel (13) is used for mounting the second collimating mirror (14); N first mounting barrels (4) are uniformly arranged along the circumference between the first supporting barrel (13) and the inner wall of the combining barrel (5); a mounting seat (2) is arranged in the first mounting barrel (4), and N mounting seats (2) are respectively used for mounting N fiber lasers (1), and the laser emission port of the fiber laser (1) faces the second mounting barrel (9); A second supporting barrel (10) is coaxially arranged in the second mounting barrel (9), N first collimating mirrors (6) are uniformly embedded between the inner wall of the second mounting barrel (9) away from the combining barrel (5) and the second supporting barrel (10), and N first collimating mirrors (6) are respectively located on the emission light path of N fiber lasers (1); the second collimating mirror (14) is located on the reflection light path of N first collimating mirrors (6); the end of the second supporting barrel (10) close to the combining barrel (5) is used for mounting the axicon mirror (12), and the axicon mirror (12) is located on the reflection light path of the second collimating mirror (14); an light outlet (51) is arranged on the side wall of the combining barrel (5) and located on the reflection light path of the axicon mirror (12); N first collimating mirrors (6) respectively receive the emitted laser of N fiber lasers (1), and reflect the emitted laser into the second collimating mirror (14), after converging through the second collimating mirror (14), reflect into the axicon mirror (12), and output the combined beam after reflecting through the axicon mirror (12).

2. The multi-channel fiber laser beam combining structure according to claim 1, characterized in that: It further comprises a baffle and a plurality of wedge blocks (3); The side walls of the combining barrel (5) and the second mounting barrel (9) are both provided with a hollow; the baffle is arranged in the hollow; The outer wall of the first mounting barrel (4) is provided with a slope surface matched with the slope surface of the wedge block (3), the wedge block (3) is arranged between the outer wall of the first mounting barrel (4) and the combining barrel (5), and is used for adjusting the relative position of each first mounting barrel (4) and the combining barrel (5), so that the center of the light spot of the emitted laser of each fiber laser (1) is coincided.

3. The multi-channel fiber laser beam combining structure according to claim 1 or 2, characterized in that: It further comprises N mounting brackets (8) arranged between the inner wall of the second mounting barrel (9) away from the combining barrel (5) and the second supporting barrel (10), N mounting shafts (7) respectively arranged on the N mounting brackets (8), and a bonding plate (11), a mirror frame (15), a pressing ring (16) and a plurality of fan-shaped pressing plates (17); N first collimating mirrors (6) are respectively mounted on N mounting shafts (7); The fold mirror (12) is arranged on the second supporting cylinder (10) through an adhesive plate (11); The second collimating mirror (14) is arranged on the first supporting cylinder (13) far away from the beam combining cylinder (5) through a mirror frame (15); A pressing ring (16) is arranged between the mirror frame (15) and the first supporting cylinder (13); The fan-shaped pressing plate (17) is arranged on the end face of the beam combining cylinder (5) far away from the second mounting cylinder (9) for pressing the first mounting cylinder (4) and the beam combining cylinder (5) tightly.

4. The multi-channel fiber laser beam combining structure according to claim 3, characterized in that: The fold mirror (12) is provided with multiple layers of dielectric films; The distance between the first collimating mirror (6) and the second collimating mirror (14) is 634.3 mm.

5. The multi-channel fiber laser beam combining structure according to claim 4, characterized in that: The N is 12; The collimating mirror (6) is an off-axis parabolic mirror with an off-axis amount of 99 mm and an off-axis angle of 9.7°; The fold mirror (12) is a horseshoe-shaped mirror with an elliptical reflecting surface, a long axis of the reflecting surface of 155.56 mm, a short axis of the reflecting surface of 110 mm, and a normal line of the reflecting surface forming an angle of 45° with the horizontal plane; The second collimating mirror (14) is a non-spherical mirror with a non-spherical coefficient of 0.2468.

6. The method of assembling the multi-channel fiber laser beam combining structure according to any one of claims 1-5, characterized in that, The method comprises the following steps: 1) Pre-installing N fiber lasers (1), N mounting seats (2), N first mounting cylinders (4), N first collimating mirrors (6), a second mounting cylinder (9), a first supporting cylinder (13), and a second collimating mirror (14); the N is an integer greater than or equal to 2; 2) Turning on any one of the fiber lasers (1), adjusting the fiber laser (1) so that the emitted laser light successively passes through the first collimating mirror (6) and the second collimating mirror (14) to serve as a reference light beam; 3) Turning on N-1 fiber lasers (1) in turn, detecting the position of the laser spot emitted by the second collimating mirror (14) by using a detector, and finely adjusting the positions of the N-1 fiber lasers (1) so that the centers of all the laser spots coincide with the center position of the light spot of the reference light beam, and then turning off the N fiber lasers (1); 4) Arranging the fold mirror (12) on the inner end face of the second supporting cylinder (10), and mounting the second supporting cylinder (10) in the second mounting cylinder (9) to complete the installation and adjustment of the multi-channel fiber laser (1).

7. The method of claim 6, wherein the method further comprises: Step 1) specifically comprises: 1.1) First, mounting the N mounting seats (2) in the N first mounting cylinders (4) respectively, then arranging the N fiber lasers (1) in the N mounting seats (2) respectively, and then distributing the N first mounting cylinders (4) on the outer end face of one end of the beam combining cylinder (5); the N is an integer greater than or equal to 2; 1.2) Second, mounting the N first collimating mirrors (6) on one end of the second mounting cylinder (9) and distributing them along the circumference; 1.3) Third, arranging the second collimating mirror (14) on the outer end face of one end of the beam combining cylinder (5) through the first supporting cylinder (13) and in the middle part. 1.4】Finally, the other end of the beam combiner (5) is connected to the other end of the second mounting cylinder (9), and N first collimating mirrors (6) are one-to-one corresponding to N fiber lasers (1).

8. The method of claim 7, wherein the method further comprises: Step 2) is specifically: Open any one of the fiber lasers (1), adjust the distance between the first mounting cylinder (4) and the beam combiner (5) through the plurality of wedges (3), and then adjust the position of the fiber laser (1) so that the emitted laser light is reflected by the first collimating mirror (6) and the second collimating mirror (14) in turn and then emitted as a reference beam.

9. The method of claim 8, wherein the method further comprises: Step 3) is specifically: Open N-1 fiber lasers (1) in turn, detect the position of the laser spot emitted by the second collimating mirror (14) using a detector, adjust the distance between each first mounting cylinder (4) and the beam combiner (5) through the plurality of wedges (3), and then fine-tune the position of the N-1 fiber lasers (1) so that the centers of all laser spots coincide with the center position of the reference beam spot; after adjusting the position of each fiber laser (1), press its corresponding first mounting cylinder (4) through the sector-shaped pressing plate (17) until all fiber lasers (1) are fixed in position, and then turn off the N fiber lasers (1).

10. The method of claim 9, wherein the method further comprises: Step 4) is specifically: The folded mirror (12) is arranged on the inner end face of the second support cylinder (10) through the adhesive plate (11), and the second support cylinder (10) is installed in the second mounting cylinder (9), completing the assembly and adjustment of the multiple fiber lasers (1).

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