A precision pluggable high-power optical fiber coupling collimation device and method for engineering applications

Abstract

A precision pluggable high-power fiber coupling collimation device and method for engineering applications, wherein the fiber end cap glass body is circumferentially welded and fixed to the end cap flange, the end cap tail end is fused and connected to the output fiber, and after testing, the focal length is corrected by the flange gasket and then fixed to the positioning plug-in component to form a fiber end cap output head; the positioning plug-in component is preliminarily processed with the collimation housing for tapered hole pairing and assembly, and is installed to the front end of the collimation housing through a group of positioning tapered pins; the rear end is sequentially integrated with the adjustment gasket and the collimation mirror assembly. The fiber end cap output head is positioned by the axial hole matching of the positioning plug-in component and the tapered pin group, and has the advantages of high reset accuracy, simple structure, convenient operation, and good stability. The high-precision reset solution for the optical axis and pupil in the high-power fiber coupling collimation device provided by the present invention improves the interchangeability and adaptability of the fiber end cap output head, realizes the modular separation design of the high-power fiber laser and the synthesis device, and obtains a near-diffraction-limited beam quality output after plug-in reset.

Description

Technical Field

[0001] The present invention belongs to the field of high-power fiber laser technology, especially the field of high-power fiber laser and high-power laser synthesis, and relates to high-power fiber coupling connection technology, especially a repeated positioning method with high requirements on the coincidence accuracy of the near-field pupil and far-field optical axis of the laser output spot. Background Art

[0002] When a high-power fiber laser uses a high-power energy transfer fiber for laser output, due to the small core diameter of the energy transfer fiber and the high optical power density, when the fiber end face is contaminated, the cut surface quality is poor, or there are material defects, the energy may be concentrated in the local position of the cross section, thereby causing damage to the fiber end face. In addition, the return light at the fiber end face has a greater impact on the local temperature rise, which directly affects the product performance. The safety of the energy transfer fiber is also the key to restricting the reliability of the laser. Using a fiber end cap to fuse the energy transfer fiber can expand the light spot and reduce the optical power density at the output end, thereby improving reliability.

[0003] When using high-power fiber lasers to boost output energy, after the fiber-coupled collimator and the subsequent synthesis optical path are adjusted, in order to obtain a near-diffraction-limited beam quality output spot, the traditional method is usually to fix the relative position of the fiber-coupled collimator and the subsequent optical path and not separate them. At the single-machine integration site, they are connected by fiber fusion splicing. The on-site processing, packaging and protection of the external melting point of the high-power fiber becomes a key factor in the power boost of the high-power laser. This method has high requirements for on-site environmental pollution prevention, complex operation, low fault tolerance, and it is difficult to guarantee reliability.

[0004] In the prior art 1: the invention is a high-power output fiber coupling device, with the authorization number CN109001872B. The patent uses a single convex lens coupling method. Considering that the optical surface with less Fresnel reflection can ensure the coupling efficiency, it is inevitable that the spherical aberration of the optical system cannot be eliminated, and the output laser beam quality is poor. In addition, the coupling plug adopts a single conical surface positioning method. The positioning accuracy is limited by the influence of the actual processing of the conical surface matching and cannot correct the difference in mutual coupling between the coaxiality of the optical axis of the fiber end cap and the coupling plug, making it difficult to obtain a beam quality close to the diffraction limit.

[0005] In the prior art 2: the invention name is a fiber end cap with collimation function and its preparation method, which is disclosed in the publication number CN114153031 and in the prior art 3: a method for manufacturing a high-power fiber end cap, which is authorized by the publication number CN114153031. In the invention, the fiber end cap is designed to pre-collimate the fiber beam in the convex area of ​​the spherical lens. The spherical aberration of the single-mirror collimation is large, and the beam quality cannot be guaranteed. When the power of a single fiber is large, the return light power converges to the focus, which will cause the end cap to have a high temperature rise, affecting the product reliability; and the transmission beam diameter after collimation is relatively small. When the power of the subsequent laser needs to be expanded, when the power of the single fiber is large, the local power density irradiated to the surface of the mirror group becomes larger, and the thermal effect of the reflector is aggravated, affecting the beam quality of the subsequent optical path. The invention adopts a single cylindrical convex collimating lens and a fiber end cap as an integrated design, which has poor effects on suppressing the return light of the subsequent stray light and eliminating spherical aberration, and is limited in higher power laser applications. Summary of the invention

[0006] In order to solve the above-mentioned technical and engineering application problems, the present invention provides a high-power fiber-optic coupling collimation device and method that is easy to operate, safe and reliable, and can be precisely plugged and unplugged for engineering applications. It expands and collimates the laser output fiber spot, controls the coarse and fine positioning accuracy and focal length compensation between the positioning plug-in and the collimation shell, realizes high-precision repeated positioning and focal length compensation of the near-field pupil and far-field optical axis of different end cap components, and outputs near-diffraction limit beam quality. It has the advantages of easy operation, safety and reliability, high reset accuracy, good beam quality, and good stability.

[0007] The technical solution of the present invention is as follows:

[0008] A high-power optical fiber coupling collimation device capable of precise pluggability for engineering applications comprises a laser output optical fiber (1), an optical fiber armor (2), a protective tail sleeve (3), a tail cover (4), an end cap tail frame (5), an optical fiber end cap (6), an end cap flange (7), a flange gasket (8), a front-stage sealing ring (9), a positioning plug-in component (10), a positioning cone pin (11), a rear-stage sealing ring (12), a collimation housing (13), a compensation gasket (14), a collimation lens seat (15), a collimation lens a (16), a lens spacer (17), a collimation lens b (18), a collimation pressure ring (19), and a radial sealing ring (20).

[0009] The optical fiber end cap glass body is fixed to the end cap flange, the optical fiber end cap tail end is fused and connected to the output optical fiber, and the optical fiber armor (2), the protective tail sleeve (3), the tail cover (4), and the end cap tail frame (5) are sequentially integrated using a dedicated end cap integration device to ensure strict centering during the integration process, and then the standard parts are coated with glue to obtain an end cap assembly; a focal length screening device is used to test each end cap assembly and record the focal length difference Δf with the reference end cap assembly, and the flange gasket (8) is adjusted according to the data to select a suitable matching thickness; the end cap assembly is sealed and fixed by the flange gasket (8), the front-stage sealing ring (9) and the positioning plug-in component (10) to form an optical fiber end cap output head;

[0010] A rear-stage sealing ring (12) is installed on the end face of the optical fiber end cap output head, and a group of positioning (5) taper pins are used to connect the optical fiber end cap output head, the rear-stage sealing ring (12) and the front end of a collimating housing (13); a collimating pressing ring (19) is used to press the designed collimating lens a (16), the lens spacer (17) and the collimating lens b (18), and the collimating lens assembly is formed after being fixed in the circumferential direction; each collimating lens group is tested by a reference end cap in a focal length screening device to match the thickness of a suitable compensation gasket (14); a sealing ring (20) is installed at a radial position of the collimating lens assembly and connected to the rear end of the collimating housing (10) through the compensation gasket (14).

[0011] Preferably, the fixing form between the glass body of the optical fiber end cap (2) and the end cap flange (3) can be a cylindrical circumferential metallization welding method, and the filler can be a low-temperature solder, which can improve the overall thermal conductivity of the product and reduce the temperature gradient; at the same time, it can effectively release welding stress and thermal stress and improve stability; or a cylindrical circumferential bonding method can be adopted, and a low-refractive index silicone rubber with a small modulus can be selected for fixing;

[0012] Preferably, the precision pluggable high-power optical fiber end cap alignment device can achieve full cavity sealing through end face and radial sealing, thereby improving anti-pollution effects and increasing product reliability without affecting the resetting accuracy of the optical axis.

[0013] Preferably, the optical fiber end cap material is high-purity fused quartz, the light-emitting surface is concave, the radius of curvature is R, and it is coated with a high-transmittance dielectric film that matches the wavelength of the laser light source; the tail end of the optical fiber end cap is fused with the output optical fiber, and the coaxial angle is better than 0.1°;

[0014] Preferably, the collimating lens group is designed as a double mirror, and the material is high-purity fused quartz, which can effectively eliminate spherical aberration as much as possible, reduce the power of the front-stage laser return light, and improve product reliability;

[0015] Preferably, the inner wall of the collimating lens barrel (10) is sandblasted, matte threaded, black anodized, etc. to further suppress the influence of the returned stray light on the melting point, thereby improving the reliability of the laser.

[0016] Preferably, the positioning plug-in component (10) and the alignment housing (12) are roughly positioned by matching the shaft hole tolerance H7 / f8, and are precisely positioned by matching and combining the double positioning cone pins (11); double straight pins are used as reference pin holes before the cone pin matching processing and reaming; during matching, the processing reamer and pins are strictly selected, and the cone pin holes are processed and reamed in an integrated manner;

[0017] A method for precise pluggable high-power optical fiber coupling and alignment for engineering applications comprises the following steps:

[0018] S1: The positioning plug-in component (10) is matched with the alignment housing (13)

[0019] Insert the axial outer diameter of the positioning plug-in component (10) into the inner diameter of the alignment shell (13) for rough positioning, and use two cylindrical pins a (11-5) and a cylindrical pin b (11-6) at the end surface of the positioning plug-in component (10) for auxiliary positioning to ensure the centering deviation range of the initial reference; fix the positioning plug-in component (10) to the alignment shell (13) by fasteners, and integrally process and hinge a conical pin hole, and control the depth of the pin hole to be greater than 2 times the pin diameter, and match the positioning plug-in component (10) with the alignment shell (13) by matching the pin;

[0020] S2: Flange gasket correction of end cap assembly

[0021] The differences between the end cap assemblies are compensated for by the focal length of the flange gasket (8). The focal length compensation test device is used to test each end cap assembly and record the focal length difference Δf1 with the reference end cap assembly. The matching thickness D of the flange gasket (8) is adjusted according to the correction data. x1 ;

[0022] S3: Compensation shim correction for collimating lens group

[0023] The focal length differences of different collimating lens assemblies are compensated by a compensation gasket (14); each collimating lens group is tested by a reference end cap and a focal length compensation test device, and the thickness D of the appropriate compensation gasket (14) is adjusted and matched. x2 ;

[0024] S4: Reset and install the fiber end cap output head

[0025] During installation, after the optical fiber end cap output head and the collimation housing (13) are aligned and inserted, two positioning cone pins (11) are used to position according to the operation requirements. At the same time, the tail end of the positioning cone pin (11) is processed with a screw, and the pin puller is used to repeatedly insert and pull out the matching cone pins for positioning. After the fasteners are installed, the two positioning cone pins (11) are removed, thereby obtaining a higher matching accuracy. The high-precision optical axis and pupil reset of the optical fiber end cap output head and the collimation optical path is achieved;

[0026] S5: Compensation for thermal effects of the collimator

[0027] When the quality requirement of the collimated high-power laser beam is high, in order to compensate for the beam quality attenuation caused by the thermal effect of the optical fiber end cap and the collimator under the action of the high-power laser, the thickness of the end cap assembly flange gasket (8) can be adjusted to compensate for it;

[0028] In summary, compared with the prior art, the advantages of the present invention are:

[0029] 1. The invention provides a precision pluggable high-power fiber coupling collimation device and method for engineering applications, which solves the problem of high-precision coupling between high-power laser fiber and subsequent synthesis device in the field of traditional high-power laser synthesis technology. Through reasonable process steps and methods, the laser output beam has good quality and high pointing accuracy, and can be detached and installed, and precisely plugged and reset. The operation is simple, safe and reliable, and the difficulties caused by on-site optical path axis-pupil coupling and debugging, as well as the problems of reduced reliability introduced by external welding melting points, are avoided.

[0030] 2. The invention provides a precision pluggable high-power fiber coupling collimation device and method for engineering applications. The device and method adopt a concave fiber end cap output combined with a double collimating mirror combination design to effectively increase the spot size of the subsequent optical path, reduce the power density, and reduce the influence of the thermal effect of the optical path on the beam quality. It effectively suppresses stray light, reduces the return light power, and improves the reliability of the laser in engineering applications.

[0031] 3. The invention discloses a precision pluggable high-power optical fiber coupling and collimation device and method for engineering applications, which adopts a modular and process-oriented way of thinking, is easy to operate and has good maintainability. Through the precision control, screening and compensation methods of the optical fiber end cap assembly in combination with the coarse and fine positioning methods, it realizes the rapid and high-precision coupling of the laser output optical fiber and the subsequent optical path, providing effective technical support for the further improvement of the subsequent high power. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to explain the technical solution of the present invention in detail and intuitively, the following is a brief description of the drawings required for use in the embodiments.

[0033] Figure 1 Shown is an isometric view of a precision pluggable high-power optical fiber coupling collimation device for engineering applications of the present invention.

[0034] Figure 2 Shown is a cross-sectional view of a precision pluggable high-power optical fiber coupling collimation device for engineering applications of the present invention.

[0035] Figure 3 Shown is an internal optical path diagram of a precisely pluggable high-power optical fiber coupling for engineering applications of the present invention.

[0036] Figure 4 The figure shows the mating position of the reset pin in the precise pluggable high-power optical fiber coupling for engineering application of the present invention.

[0037] Figure 5 Shown is a schematic diagram of a multi-channel collimation output device involved in an embodiment of the present invention.

[0038] Figure 6 Shown is a schematic diagram of another multi-channel collimation output device involved in an embodiment of the present invention.

[0039] In the figure: laser output optical fiber (1), optical fiber armor (2), protective tail sleeve (3), tail cover (4), end cap tail frame (5), optical fiber end cap (6), end cap flange (7), flange gasket (8), front stage sealing ring (9), positioning plug-in (10), positioning cone pin (11), rear stage sealing ring (12), collimating housing (13), compensation gasket (14), collimating lens seat (15), collimating lens a (16), lens spacer (17), collimating lens b (18), collimating pressure ring (19), radial sealing ring (20) DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the embodiments and the accompanying drawings, which are described in more detail and in detail, but the scope of protection of the present invention should not be limited by this. For those skilled in the art, several modifications and extensions can be made without departing from the spirit and scope of the present invention, so the scope of protection of the present invention should be based on the scope defined by the claims.

[0041] Figure 1 , Figure 2 The invention is a schematic diagram and a cross-sectional diagram of a high-power optical fiber coupling collimation device and method for engineering application that can be precisely plugged and unplugged, comprising a laser output optical fiber (1), an optical fiber armor (2), a protective tail sleeve (3), a tail cover (4), an end cap tail frame (5), an optical fiber end cap (6), an end cap flange (7), a flange gasket (8), a front-stage sealing ring (9), a positioning plug-in component (10), a positioning cone pin (11), a rear-stage sealing ring (12), a collimation housing (13), a compensation gasket (14), a collimation lens seat (15), a collimation lens a (16), a lens spacer (17), a collimation lens b (18), a collimation pressure ring (19), and a radial sealing ring (20).

[0042] The glass circumferential surface of the optical fiber end cap (2) is subjected to metallization gold plating, and the corresponding mating surface of the end cap flange (3) is also subjected to gold plating, with the thickness of the gold plating layer being about 1-3 um; and they are welded together to form an end cap structure; the end cap structure is connected to a special welding fixture and installed in the corresponding position of the fusion splicer, and the laser output optical fiber (1) (the end face inclination angle is less than 1°) and the optical fiber end cap (2) tail end centering angle (less than 0.1°), insertion depth and temperature are adjusted before fusion splicing; after the optical fiber fusion splicing is completed, the optical fiber armor (2), the protective tail sleeve (3), the tail cover (4), and the end cap tail frame (5) are sequentially integrated using a special end cap integration device while ensuring strict centering, and the standard parts are glued to fix the force to obtain an end cap assembly; finally, the focal length difference between each end cap assembly and the reference end cap assembly is tested and recorded through an end cap focal length screening device, and the matching thickness of the flange gasket (8) is adjusted according to the data, and the actual test deviation Δd<0.1mm.

[0043] The method comprises the following steps: using the screened end cap assembly, docking the matched flange gasket (8), the front-stage sealing ring (9) and the positioning plug-in component (10) to form an end cap output head; using a group of positioning cone pins (5) to connect the end cap output head, the rear-stage sealing ring (12) and the front end of the collimating housing (13); using a collimating pressure ring (19) to press the designed collimating lens a (16), the lens spacer (17) and the collimating lens b (18), and fixing them by circumferential glue injection to form a collimating lens assembly; installing a sealing ring (20) at a radial position of the collimating lens assembly, and connecting it to the rear end of the collimating housing (10) by a compensation gasket (14); when testing the beam quality in the rear optical path, the end cap flange is fine-tuned to achieve the best beam quality state and glue is applied for curing, and the optical fiber end cap output head can be separated and reset from the collimating housing by a group of positioning cone pins (5), and the optical axis reset accuracy of the urad level can be obtained;

[0044] like Figure 3 As shown, the fiber end cap material is high-purity fused quartz, the light-emitting surface is concave, R=50mm, and is coated with a high-transmittance dielectric film that matches the wavelength of the laser light source, with a transmittance of >99.95%; the tail end of the fiber end cap is fused with the output optical fiber, and the coaxial angle is better than 0.1°.

[0045] The optical fiber end cap and the optical fiber end cap flange are metallized with gold plating, the low-temperature solder selected is indium sheet, the end cap material is titanium alloy, the contact area is gold-plated, the thickness of the gold layer is 1-3um, the welding position is cylindrical circumferential welding, and the leakage rate after welding is less than 1.0x 10 -8 m 3 / s.

[0046] The collimating lens group is designed as a double mirror, and the material is high-purity fused quartz, which can effectively eliminate spherical aberration. The surface is coated with an anti-reflection medium film corresponding to the wavelength of the laser light source, and the transmittance is>99.95%.

[0047] The collimating lens barrel is made of indium steel, with dark nickel plating on the surface, and the radial point between the collimating lens a and the collimating lens b is made of silicone rubber with low outgassing rate, and the test leakage rate is less than 1.0x 10 -8 m 3 / s;

[0048] As described above, the inner wall of the collimating housing is black anodized and surface sandblasted to effectively suppress the returned stray light.

[0049] As stated, Figure 4 As shown, in the embodiment, the positioning plug-in component (10) and the collimating housing (12) are roughly positioned by the shaft hole tolerance H7 / f8, and are precisely positioned by the combination of double positioning cone pins (11); the straight pin a (11-5) and the straight pin b (11-6) are reference pin holes before matching processing and reaming; when matching, the processing reamer and the pin are strictly selected, and the positioning plug-in component (10) and the collimating housing (12) are assembled and processed after installation, and 4mm cone pins are selected, the cone pin a (11-1) is matched with the cone pin b (11-2), the cone pin c (11-3) is matched with the cone pin d (11-4), and the angle between the matched cone pins and the optical axis is 120°; at the same time, the tail end of the positioning cone pin (11) is processed with a screw, and the matching cone pins are repeatedly plugged in and out for positioning with a pin puller.

[0050] As described above, the fiber optic plug-in head is subjected to 50 repeated fiber resetting tests, and a 5.5m focal length flat light tube is selected for repeated testing. The pointing deviation of the far-field optical axis is about 5urad-10urad, and the beam quality is close to the diffraction limit β<1.1. When a single-channel 3500w light output test is performed, the return light detection power is less than 30mw.

[0051] like Figure 5 , Figure 6 As shown, the schematic diagrams of the other two multi-channel collimation output devices involved in the embodiment are shown. The collimator lens assembly is inside the collimator housing and is integrated with the post-stage power boost optical path. During the single-fiber 3.8kW power light output process, the beam quality β=1.06, and the position of the output optical axis is recorded on the β tester. After removing the double positioning cone pin, the end cap flange is completely separated from the collimator lens barrel, and the fiber end cap flange is reinserted and positioned and connected using the double cone pin, the output beam quality β=1.05 is tested by opening the light, and the position of the output optical axis is recorded on the β tester; the above operation is repeated for 30 times, and the beam quality β value is stable, and the change in the optical axis direction is within 10urad.

Claims

1. A high-power fiber coupling collimation device that can be precisely plugged and unplugged for engineering applications, comprising a laser output fiber (1), a fiber armor (2), a protective tail sleeve (3), a tail cover (4), an end cap tail frame (5), a fiber end cap (6), an end cap flange (7), a flange gasket (8), a front-stage sealing ring (9), a positioning plug-in component (10), a positioning cone pin (11), a collimation housing (13), a compensation gasket (14) and a collimation lens assembly; the collimation lens assembly comprises a collimation lens seat (15), a collimation lens a (16), a lens spacer (17), a collimation lens b (18), a collimation pressure ring (19), and a radial sealing ring (20); The circumferential or radial part of the glass body of the optical fiber end cap (6) is fixed to the end cap flange (7), the tail end of the optical fiber end cap is fused to the output optical fiber (1), and the optical fiber armor (2), the protective tail sleeve (3), the tail cover (4) and the end cap tail frame (5) are sequentially installed using a dedicated end cap integration device to obtain an end cap assembly; each end cap assembly is tested using a focal length compensation test device and the focal length difference Δf1 with the reference end cap assembly is recorded, and the matching thickness D of the flange gasket (8) is adjusted according to the correction data. x1 The end cap assembly is sealed and fixed through the flange gasket (8), the front-stage sealing ring (9) and the positioning plug-in member (10) to form an optical fiber end cap output head; A set of positioning cone pins (11) are used to connect the optical fiber end cap output head to the front end of the collimating housing (13); the collimating lens a (16), the lens spacer (17), and the collimating lens b (18) are pressed in sequence by a collimating pressure ring (19), and the collimating lens assembly is formed after being fixed in the circumferential direction; the collimating lens assembly is tested by a reference end cap assembly in a focal length compensation test device, and the thickness D of a suitable compensation gasket (14) is adjusted and matched. x2 ; Install a radial sealing ring (20) at a radial position of the collimator lens assembly, and connect the collimator lens assembly to the rear end of the collimator housing (13) via a compensation gasket (14); The optical fiber end cap output head is upwardly aligned with the housing end surface on which a rear-stage sealing ring (12) is installed; Features The optical fiber end cap (6) is made of high-purity fused quartz, the light-emitting surface is a concave surface with a radius of R, and is coated with a high-transmittance dielectric film that matches the wavelength of the laser light source.

2. According to claim 1, a high-power fiber coupling collimation device for engineering applications that can be precisely plugged and unplugged is characterized in that When the tail end of the optical fiber end cap (6) is fused with the output optical fiber, the matching coaxial angle θ is detected, and θ<0.1°.

3. According to claim 1, a high-power optical fiber coupling and collimation device for engineering applications that can be precisely plugged and unplugged is characterized in that: A partial circumferential or radial region of the glass body of the optical fiber end cap (6) is fixed to the end cap flange (7) by means of cylindrical circumferential metallization welding, or by means of cylindrical circumferential adhesive bonding.

4. According to claim 1, a high-power optical fiber coupling and collimation device for engineering applications that can be precisely plugged and unplugged is characterized in that: The collimator lens assembly is a double or triple lens, and the effective aperture of the lens is D=2.2*k*1 / e 2 (k>1); The lens is sealed circumferentially with silicone rubber with low outgassing rate, and its surface is coated with a high-transmittance anti-reflection medium film corresponding to the wavelength of the laser light source.

5. According to claim 1, a high-power fiber coupling collimation device for engineering applications that can be precisely plugged and unplugged is characterized in that The inner wall of the collimating housing (13) is sandblasted, matte threaded or black anodized to increase the absorption of stray light.

6. A collimation method used in a high-power optical fiber coupling collimation device that can be precisely plugged and unplugged for engineering applications according to any one of claims 1 to 5, characterized in that: The steps include: S1: The positioning plug-in component (10) is matched with the alignment housing (13) Inserting the axial outer diameter of the positioning plug-in component (10) into the inner diameter of the alignment housing (13) for rough positioning, using two cylindrical pins a (11-5) and cylindrical pins b (11-6) at the end surface of the positioning plug-in component (10) for auxiliary positioning, thereby ensuring the centering deviation range of the initial reference; fixing the positioning plug-in component (10) to the alignment housing (13) by fasteners, and integrally processing and hinge-forming a conical pin hole, and matching the positioning plug-in component (10) with the alignment housing (13) with a pin; S2: Flange gasket correction of end cap assembly The differences between the end cap assemblies are compensated for by the focal length of the flange gasket (8). The focal length compensation test device is used to test each end cap assembly and record the focal length difference Δf1 with the reference end cap assembly. The matching thickness D of the flange gasket (8) is adjusted according to the correction data. x1 ; S3: Compensation shim correction of collimator assembly The focal length differences of different collimator mirror assemblies are compensated by a compensation gasket (14); the collimator mirror assembly is tested by a reference end cap assembly in a focal length compensation test device, and the thickness D of the appropriate compensation gasket (14) is adjusted and matched. x2 ; S4: Reset and install the fiber end cap output head During installation, after the optical fiber end cap output head is aligned and inserted into the collimation housing (13), two positioning cone pins (11) are used for positioning. After the fasteners are installed, the two positioning cone pins (11) are removed.

7. The method for precise pluggable high-power optical fiber coupling and alignment for engineering applications according to claim 6, characterized in that: Also includes: S5: Compensation for thermal effects in fiber-coupled collimators In order to compensate for the beam quality attenuation caused by the thermal effect of the optical fiber end cap and the collimating mirror assembly under the action of high-power laser, the thickness of the flange gasket (8) of the end cap assembly can be adjusted to compensate.

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