CO2 laser large-core-diameter optical fiber end cap welding system

Abstract

The invention belongs to the technical field of optical fiber end cap welding manufacturing, and particularly relates to a CO2 laser large-core-diameter optical fiber end cap welding system. The CO2 laser large-core-diameter optical fiber end cap welding system provided by the invention comprises four paths of laser light path systems, each path of laser light path system comprises a CO2 gas laser, and the CO2 gas laser is used for generating laser; the optical fiber clamping device is used for clamping an optical fiber to be welded; the end cap clamping device is used for clamping a quartz end cap; the two electron microscopes are used for observing the positions of the optical fiber and the quartz end cap through the two electron microscopes which are vertically arranged so as to adjust the optical fiber to coincide with the central axis of the quartz end cap; the four paths of CO2 gas lasers are uniformly distributed in the circumferential direction, so that the four paths of CO2 laser uniformly cover the fusion point of the quartz end cap from four directions. According to the invention, two electron microscopes are adopted for observation, a manual alignment structure is combined, and four paths of CO2 laser are symmetrically converged and uniformly fused, so that perfect / efficient fusion of optical fibers with different diameters and special (large)-sized quartz end caps is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of fiber optic end cap fusion manufacturing, and particularly relates to a CO2 laser large core diameter fiber optic end cap fusion system. Background Art

[0002] In the past decade, fiber lasers have become the focus of attention due to their high conversion efficiency, large heat dissipation area, high output power, and good beam quality, and are widely used in many fields such as information communication, industrial processing, biomedicine, and military weapons. With the in-depth research and application, the demand for the output power of fiber lasers is also continuously increasing. With the large-scale application of large mode field double-clad fibers, the output power of fiber lasers has been rapidly improved, and high-power fiber lasers with hundreds of watts and kilowatts have been widely used in industrial fields such as material cutting and processing and military defense fields such as deep space long-distance optoelectronic countermeasures. However, with the increase in the output laser power, limited by the fiber core size, the power density at the output end of the fiber laser has approached the limit. Without reducing the output power, a feasible method to reduce the power density at the output end of the fiber laser is to increase the output end surface area, and the fiber end cap technology has emerged as the times require.

[0003] At present, there are three methods for fiber optic end cap fusion heating, namely wire flame heating process, arc ring heating process, and CO2 laser heating process. Wire flame heating is to generate a high-temperature flame above 2000 °C by burning a hydrogen-oxygen mixed gas to achieve fusion, but its process cost is relatively high and its service life is relatively short. The heating area formed by arc ring heating is large, the heating is uniform, and the service life is relatively long. The process is relatively mature and suitable for on-site emergency repair and small-scale operations. It is the process method adopted by common fiber optic fusion equipment at present, but the metal oxides generated by the arc may contaminate the fusion end surfaces of the fiber and the quartz end cap, and a dust removal device needs to be equipped to meet the fusion requirements. At the same time, limited by the arc ring size, it is difficult to achieve uniform fusion between fibers and quartz end caps with a large diameter difference. The CO2 laser heating method utilizes the strong absorption characteristic of quartz materials for 10.6 μm laser, and uses the 10.6 μm laser generated by a CO2 gas laser to heat and fuse the fiber and the quartz end cap, without introducing any impurities and pollutants during the fusion process, and the heating accuracy during the fusion process is high, but there are strict requirements for the shape, uniformity, and stability of the laser spot.

[0004] Fusing a section of quartz end cap at the output end of the fiber laser can expand the fiber size of the laser outlet from dozens of micrometers of the core to hundreds of micrometers or even larger, greatly reducing the power density of the output laser. However, most fiber end cap diameters are the same as the inner cladding size of the fiber, which is convenient for direct fusion by existing fiber optic fusion machines. However, if it is necessary to continue to increase the fiber end cap size to reduce the power density at the output end of the fiber laser, commercial fusion machines on the existing market cannot or can only fuse fibers and quartz end caps with a small diameter difference.

[0005] To achieve the fusion splicing of optical fibers and quartz end caps of different sizes, especially the fusion splicing of optical fibers and millimeter-sized large-diameter planar optical fiber end caps, the present invention proposes and designs a large-diameter optical fiber end cap fusion splicing system, which can achieve the fusion splicing of optical fibers with different diameters and special (large)-sized quartz end caps. Summary of the Invention

[0006] The present invention provides a CO2 laser large-core-diameter optical fiber end cap fusion splicing system to solve the problem that the prior art cannot or can only fuse optical fibers and quartz end caps with relatively small diameter differences. This fusion splicing system can achieve the efficient fusion splicing of optical fibers with different diameters and special (large)-sized quartz end caps.

[0007] An embodiment of the present invention provides a CO2 laser large-core-diameter optical fiber end cap fusion splicing system, including: A four-way laser optical path system, each way of the laser optical path system includes a CO2 gas laser, and the CO2 gas laser is used to generate laser as the heat source of the fusion splicing system; An optical fiber clamping device for clamping the optical fiber to be fusion spliced; An end cap clamping device for clamping the quartz end cap; Two electron microscopes, which are used to observe the positions of the optical fiber and the quartz end cap to adjust the coincidence of the central axes of the optical fiber and the quartz end cap; Among them, the four-way laser optical path system is circumferentially evenly distributed, so that the four-way CO2 laser uniformly covers the fusion splicing point of the quartz end cap from four directions.

[0008] According to an embodiment of the present invention, the lines of sight of the two electron microscopes are perpendicular to each other and the two electron microscopes are at the same height. Specifically, the lines of sight of the two electron microscopes being perpendicular to each other can be that the two electron microscopes are vertically placed. The advantage of using two vertically placed electron microscopes at the same height is that by adjusting the angles and positions of the optical fiber and the quartz end cap, the coincidence of the central axes of the optical fiber and the end cap can be further ensured.

[0009] According to an embodiment of the present invention, each electron microscope is connected to the USB electron microscope software to upload the image to the computer to determine the fusion splicing position through the reference position shown in the image. Specifically, one electron microscope is set at each of the left and right 45° behind the side of the fusion splicing point of the optical fiber and the quartz end cap. The two are perpendicular to each other at 90° at the same height for cross observation, and are connected to the USB electron microscope software. The operator accurately determines the fusion splicing position on the computer through the reference positions shown in the images transmitted back by the two electron microscopes. That is, the multiple horizontal and vertical grid lines shown in the image are used as reference lines to provide a reference scale for adjusting the coaxiality of the optical fiber and the quartz end cap, the pre-fusion distance, etc. and the relative positions of the optical fiber and the quartz end cap.

[0010] According to an embodiment of the present invention, each laser optical path system includes a pinhole diaphragm, and the pinhole diaphragm is used to shape the laser spot output by the CO2 laser. Specifically, each laser optical path system includes a pinhole diaphragm, which shapes the output laser of the CO2, intercepts the part with the most concentrated energy in the center of the spot, and obtains a suitable spot size and shape.

[0011] According to an embodiment of the present invention, each laser optical path system includes an electronic control chopper, and the electronic control chopper is used to adjust and control the CO2 laser welding power. Specifically, each laser optical path system includes an electronic control chopper, and the electronic control chopper precisely adjusts the laser energy by adjusting the duty cycle.

[0012] According to an embodiment of the present invention, the system further includes a one-dimensional electronic control translation stage, and the one-dimensional electronic control translation stage is used to fix the optical fiber clamping device to move the optical fiber so that the optical fiber is welded to the quartz end cap. Specifically, the optical fiber clamping device is installed on the one-dimensional electronic control translation stage and can clamp the optical fiber to move in the up and down directions to weld the optical fiber to the quartz end cap.

[0013] According to an embodiment of the present invention, the system further includes a three-dimensional translation stage and a one-dimensional pitch adjustment stage. The three-dimensional translation stage and the one-dimensional pitch adjustment stage are used to install the end cap clamping device to adjust the position and angle of the quartz end cap so that the central axes of the optical fiber and the quartz end cap coincide. Specifically, the one-dimensional pitch adjustment stage is used to install the end cap clamping device to adjust the angle of the quartz end cap. The one-dimensional pitch adjustment stage is installed on the three-dimensional translation stage, and the three-dimensional translation stage is used to adjust the position of the quartz end cap so that the central axes of the optical fiber and the quartz end cap coincide.

[0014] According to an embodiment of the present invention, the four CO2 gas lasers are of the same type. Specifically, four CO2 gas lasers of the same type can output four laser beams simultaneously, and the four laser beams can be independently controlled, so that the uniformity of the heating area can be better controlled and the power of the output laser at the convergence point can be stabilized.

[0015] According to an embodiment of the present invention, each laser optical path system includes a gold-plated mirror. Specifically, each laser optical path system includes two gold-plated mirrors, and the gold-plated mirrors are used to adjust the laser optical path and the welding angle.

[0016] According to an embodiment of the present invention, each laser optical path system includes a ZnSe convex lens, and the ZnSe convex lens is used to converge the laser to the welding point of the optical fiber and the quartz end cap to realize the welding of the optical fiber and the quartz end cap. Specifically, each laser optical path system includes a ZnSe convex lens. By using the ZnSe convex lens to converge the laser beam, the optical fiber and the quartz end cap in the welding area can be uniformly heated, thereby realizing the precise welding of the optical fiber and the end cap.

[0017] A CO2 laser large-core fiber end-cap fusion splicing system provided by the present invention has the following beneficial effects: 1. Using a CO2 gas laser as the heating source, four lasers are simultaneously converged to a point for direct heating and fusion splicing. The power of the laser output at the convergence point is stable. Each laser can be individually adjusted and independently controlled, which can better control the uniformity of the heating area, and the size range is controllable. Thus, the fusion splicing of optical fibers and quartz end-caps with large diameter differences can be achieved, including the fusion splicing of ordinary optical fibers and millimeter-scale quartz end-caps, and the fusion splicing of hundred-micron large-mode-field double-clad optical fibers and millimeter-scale quartz end-caps.

[0018] 2. By observing with two electron microscopes and manual alignment, it can ensure that the central axes of the optical fiber and the end-cap coincide, solving the problems of difficult precise alignment and uneven pre-fusion heating area during the fusion splicing of optical fibers and large-size quartz end-caps, and realizing the perfect / high-efficiency fusion splicing of optical fibers with different diameters and special (large)-size quartz end-caps.

[0019] 3. It can accurately control the heating power of the CO2 laser and the docking calibration accuracy, and manufacture an integrated fiber end-cap that can withstand high-power laser output. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is a top view of a schematic diagram of a CO2 laser large-core fiber end-cap fusion splicing system according to an embodiment of the present invention; Figure 2 is a schematic diagram of the alignment of an optical fiber to be fusion spliced and a quartz end-cap according to an embodiment of the present invention. Detailed Embodiments

[0022] To make the purpose, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] An embodiment of the present invention provides a CO2 laser large-core fiber end-cap fusion splicing system.

[0024] Including: a four-way laser optical path system, an optical fiber clamping device, an end cap clamping device, and two electron microscopes. Each laser optical path system includes a CO2 gas laser, and the CO2 gas laser is used to generate laser, serving as the heat source of the welding system.

[0025] First, the fiber end cap welding system implemented according to the present invention will be specifically described below in conjunction with the accompanying drawings.

[0026] Please refer to Figure 1 and Figure 2 , the fiber end cap welding system provided by an embodiment of the present invention, that is, an experimental device, includes 4 CO2 gas lasers, 4 small hole diaphragms, 4 electronically controlled choppers, 8 gold-plated mirrors, 4 thin convex lenses of ZnSe, 2 electron microscopes, 1 one-dimensional electronically controlled translation stage, 1 one-dimensional pitching adjustment stage, 1 three-dimensional translation stage, 1 optical fiber clamping device, and 1 end cap clamping device. Through this system, the lasers output by 4 identical CO2 lasers are simultaneously output and converged to the fusion point of the quartz end cap.

[0027] Specifically, the four laser optical path systems are respectively: the first laser optical path system, the second laser optical path system, the third laser optical path system, and the fourth laser optical path system. The first laser optical path system sequentially includes a CO2 gas laser 1, a small hole diaphragm 2, an electronically controlled chopper 3, a first gold-plated mirror 4, a second gold-plated mirror 9, and a ZnSe convex lens 11; the second laser optical path system sequentially includes a CO2 gas laser 8, a small hole diaphragm 7, an electronically controlled chopper 6, a first gold-plated mirror 5, a second gold-plated mirror 10, and a ZnSe convex lens 13; the third laser optical path system sequentially includes a CO2 gas laser 19, a small hole diaphragm 20, an electronically controlled chopper 21, a first gold-plated mirror 22, a second gold-plated mirror 17, and a ZnSe convex lens 14; the fourth laser optical path system sequentially includes a CO2 gas laser 26, a small hole diaphragm 25, an electronically controlled chopper 24, a first gold-plated mirror 23, a second gold-plated mirror 18, and a ZnSe convex lens 16. The optical fiber 15 is clamped on the optical fiber clamping device 12, and the quartz end cap 29 is clamped on the end cap clamping device 30. Two electron microscopes are vertically arranged, namely the first electron microscope 27 and the second electron microscope 28. Among them, the four laser optical path systems are circumferentially evenly distributed, so that the four CO2 lasers uniformly cover the fusion point between the optical fiber 15 and the quartz end cap 29 from four directions.

[0028] Among them, the CO2 gas laser outputs laser with a wavelength of 10.6 μm.

[0029] The small hole diaphragm shapes the laser spot output by the CO2, intercepts the part with the most concentrated energy in the center of the spot, and obtains a suitable spot size and shape.

[0030] The electronic control chopper adjusts the shaped laser power, and adjusts the laser duty cycle by adjusting the relative position between the chopper and the laser, so as to accurately adjust and control the laser power.

[0031] The lasers output by 4 identical CO2 lasers are output simultaneously.

[0032] For each path of CO2 laser, 2 gold-plated total reflection mirrors are used to adjust the optical path and the welding angle.

[0033] The ZnSe convex lens converges the laser beam to the center fusion point of the quartz end cap. The other three paths of lasers are adjusted to the fusion point position of the quartz end cap according to this adjustment method.

[0034] The process of fusing the optical fiber and the quartz end cap using this experimental device includes: stripping a section of the coating layer and the outer cladding from one end of the output optical fiber, and performing a 0° cutting treatment at the end face; fixing one end of the optical fiber to be fused on an optical fiber fixture, and this fixture is fixed on a vertically arranged one-dimensional electric control translation stage, which can only move in the up and down directions; the quartz end cap is fixed on the end cap fixture on the lower one-dimensional pitch adjustment stage, and the one-dimensional pitch adjustment stage is fixed on the three-dimensional translation stage. The angle and position of the quartz end cap are adjusted through the one-dimensional pitch adjustment stage and the three-dimensional translation stage to make the quartz end cap located directly below the optical fiber; two electron microscopes are placed at the same height on the left and right sides of the fusion point of the quartz end cap at 45° from the side rear of the fusion system, and they form a 90° angle in the horizontal direction and are simultaneously aligned with the fusion point position of the optical fiber and the quartz end cap.

[0035] In the optical fiber end cap fusion system provided by another embodiment of the present invention, an electron microscope is provided on the left and right sides at 45° from the side rear of the fusion point of the optical fiber and the quartz end cap. The two are perpendicular to each other at 90° at the same height for cross observation, and the USB electron microscope software is connected. The operator accurately determines the fusion position on the computer by referring to the images transmitted back by the two electron microscopes. Specifically, the multiple horizontal and vertical grid lines displayed in the images are used as reference lines to provide a reference scale for adjusting the coaxiality of the optical fiber and the quartz end cap, adjusting the pre-fusion distance, etc., which are related to the relative position of the optical fiber and the quartz end cap.

[0036] On the other hand, the present invention also provides a fusion method for a CO2 laser large core diameter optical fiber end cap fusion system, including the following steps: 1. Positioning of the optical fiber and the quartz end cap Adjust the laser emitted by the CO2 gas laser to the fusion point of the quartz end cap in advance, and adjust the position and focus of the electron microscope so that the laser convergence point is located at a position slightly below the center of the field of view; 2. Optical fiber treatment Strip a section of the outer cladding and coating layer from one end of the double-clad fiber, perform a 0° cutting process, and fix it on the fiber clamping device, which is fixed on a one-dimensional electronically controlled translation stage; fix the quartz end cap on the fiber end cap clamping device, which is fixed on a one-dimensional pitch adjustment stage. The one-dimensional pitch adjustment stage is fixed on a three-dimensional translation stage, and make the quartz end cap in a vertical state.

[0037] 3. Coarse adjustment of the CO2 laser optical path Coarsely adjust the four-way CO2 laser optical paths in sequence to make the four-way lasers evenly cover the welding point position of the quartz end cap from four directions.

[0038] 4. Adjust the observation microscope Set the two electron microscopes perpendicular to each other, adjust the position and focal length of the electron microscopes to make the laser convergence point located at a position slightly below the center of the field of view.

[0039] 5. Adjust the positions of the fiber and the end cap Observe the fiber to be welded and the quartz end cap through the two mutually perpendicular electron microscopes, and adjust the position of the quartz end cap to make the quartz end cap directly below the fiber.

[0040] 6. Fine adjustment of the CO2 laser optical path Fine-tune the four-way CO2 laser optical paths again to make the four-way lasers converge and evenly cover the welding point position of the quartz end cap from four directions. The fine adjustment of the optical path is completed.

[0041] 7. Set the pre-welding distance and the fiber overlap amount Manually adjust the one-dimensional translation stage to make the fiber close to the welding point position. Observe through the electron microscope and set an appropriate pre-welding distance. Set the moving distance of the one-dimensional electronically controlled translation stage on the computer, and this distance is the sum of the pre-welding distance and the fiber overlap amount. The overlap amount is the distance that the fiber enters the fiber end cap during the welding process.

[0042] 8. Welding Adjust the CO2 laser welding power, start the 4 CO2 lasers and start the one-dimensional electronically controlled translation stage to perform the welding of the fiber end cap.

[0043] Among them, when coarsely adjusting the multi-way CO2 laser optical paths, the following steps are included: Turn on one CO2 laser, adjust the CO2 laser optical path to the welding point position of the quartz end cap by adjusting the angle of the total reflection mirror, and make the CO2 laser converge at the welding point of the quartz end cap by adjusting the position of the ZnSe convex lens. Adjust the other three-way CO2 lasers to the welding point according to the above method. Turn on the four-way CO2 lasers simultaneously, and adjust the optical path to make the lasers evenly cover the welding point position from four directions. The coarse adjustment of the welding optical path is completed.

[0044] According to an embodiment of the present invention, the welding process further includes: inspection after welding. Specifically, the appearance of the integrated optical fiber end cap after welding is inspected through an electron microscope, and He-Ne light is injected to test the welding effect.

[0045] According to another embodiment of the present invention, the welding process of the optical fiber and the quartz end cap using this experimental device includes: Strip a section of the coating layer and the outer cladding from one end of the optical fiber 15 to be welded, and make a 0° cut.

[0046] Fix one end of the optical fiber 15 to be welded on the optical fiber fixture above the system. This optical fiber fixture is fixed on a one-dimensional electronically controlled translation stage, and the optical fiber 15 to be welded can only move in the up and down directions along with the one-dimensional translation stage.

[0047] The quartz end cap 29 is fixed on the end cap fixture. This fixture is fixed on a one-dimensional pitch adjustment stage, and the one-dimensional pitch adjustment stage is fixed on a three-dimensional translation stage. Adjust the angle and position of the quartz end cap 29 so that it is directly below the optical fiber to be welded.

[0048] Place the first electron microscope 27 at the left rear of the welding system and the second electron microscope 28 at the right rear. Both are at the same height as the welding point of the optical fiber end cap and are perpendicular to each other in the horizontal direction. At the same time, align and focus on the welding point position of the optical fiber 15 and the quartz end cap 29.

[0049] The selected inner cladding diameter of the large-core optical fiber 15 is 400 μm, and the diameter of the quartz end cap 29 is 6 mm. The single-path welding power of the CO2 laser is about 1.2 W, the pre-welding distance is 2.00 mm, the pre-welding time is 6 s, the welding time is 2 s, the overlap amount is 0.05 mm, and the laser waist spot at the welding point is tangent to the outer edge of the optical fiber, that is, the laser spot covers the outer edge of the optical fiber.

[0050] Observe the welding situation of the optical fiber end cap through appearance detection. Couple He-Ne light into the optical fiber end of the optical fiber end cap and detect the output laser situation at the end cap end to determine whether the welding of the optical fiber end cap is successful.

[0051] Although the detected optical fiber end cap has a certain mechanical strength, it is easy to break when placed horizontally or held horizontally by hand, indicating that the optical fiber end cap needs to be protected, and generally, the optical fiber end cap needs to be encapsulated.

[0052] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or equivalently replace some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A large-core fiber end-cap fusion splicing system for a CO2 laser, characterized in that, Including: A four-way laser optical path system, each way of the laser optical path system includes a CO2 gas laser, and the CO2 gas laser is used to generate laser, serving as the heat source of the welding system; A fiber clamping device for clamping the fiber to be welded; An end cap clamping device for clamping the quartz end cap; Two electron microscopes, and the two electron microscopes are used to observe the positions of the fiber and the quartz end cap to adjust the coincidence of the central axes of the fiber and the quartz end cap; Among them, the four-way laser optical path system is circumferentially evenly distributed, so that the four-way CO2 laser uniformly covers the welding point of the quartz end cap from four directions.

2. The CO2 laser large-core diameter fiber end cap fusion splicing system according to claim 1, characterized in that, The sight lines of the two electron microscopes are perpendicular to each other, and the two electron microscopes are at the same height.

3. The CO2 laser large-core fiber end cap fusion splicing system according to claim 1 or 2, characterized in that, Each electron microscope is connected to the USB electron microscope software to upload the image to the computer to determine the welding position through the reference position displayed by the image.

4. The CO2 laser large-core diameter fiber end cap fusion splicing system according to claim 1, characterized in that Each way of the laser optical path system includes a pinhole aperture, and the pinhole aperture is used to shape the laser spot output by the CO2 laser.

5. The CO2 laser large-core diameter fiber end cap fusion splicing system according to claim 1, characterized in that Each way of the laser optical path system includes an electronically controlled chopper, and the electronically controlled chopper is used to adjust and control the CO2 laser welding power.

6. The CO2 laser large-core diameter fiber end cap fusion splicing system according to claim 1, characterized in that, Including a one-dimensional electronically controlled translation stage, and the one-dimensional electronically controlled translation stage is used to fix the fiber clamping device to move the fiber in the vertical direction to weld the fiber and the quartz end cap.

7. The CO2 laser large-core diameter fiber end cap fusion splicing system according to claim 1 or 6, characterized in that, Including a three-dimensional translation stage and a one-dimensional pitch adjustment stage, and the three-dimensional translation stage and the one-dimensional pitch adjustment stage are used to install the end cap clamping device to adjust the position and angle of the quartz end cap to make the central axes of the fiber and the quartz end cap coincide.

8. The CO2 laser large-core diameter fiber end cap fusion splicing system according to claim 1, characterized in that, The four CO2 gas lasers are of the same type.

9. The CO2 laser large-core diameter fiber end cap fusion splicing system according to claim 1, characterized in that: Each way of the laser optical path system includes two gold-plated mirrors, and the gold-plated mirrors are used to adjust the laser optical path and the welding angle.

10. The CO2 laser large-core diameter fiber end cap fusion splicing system according to claim 1, characterized in that: Each way of the laser optical path system includes a ZnSe convex lens, and the lens system is used to converge the laser to the welding point of the fiber and the quartz end cap to realize the welding of the fiber and the quartz end cap.

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