An optical fiber combiner, a laser and a laser processing apparatus

Abstract

The utility model discloses an optical fiber combiner, laser and laser processing equipment. Optical fiber combiner includes input optical fiber bundle and with the butt joint of input optical fiber bundle output optical fiber, wherein the first cladding of output optical fiber and fiber core have different refractive index, and the second cladding and first cladding have different refractive index, input optical fiber bundle includes center input optical fiber and a plurality of outer ring input optical fiber, and the fiber core of output optical fiber and center input optical fiber of input optical fiber bundle overlap, and the second cladding of output optical fiber and outer ring input optical fiber group of input optical fiber bundle overlap, and the second cladding of output optical fiber and center input optical fiber of input optical fiber bundle overlap. The utility model discloses an embodiment by using the multiple cladding output optical fiber, makes the center input light transmission in the fiber core of output optical fiber, and the outer ring input light transmission in the second cladding, and realizes the isolation through the first cladding, thereby solved the problem of center light and outer ring light crosstalk, improved the nonlinear effect of optical fiber combiner.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber device technology, and in particular to an optical fiber combiner, a laser, and laser processing equipment. Background Technology

[0002] In recent years, laser technology has emerged in industrial processing applications with its multiple advantages, including high precision, high efficiency, non-contact processing, wide applicability, and environmental protection and energy saving, and is gradually replacing traditional processes.

[0003] The demand for high-power, high-brightness lasers is surging in fields such as new energy vehicles, primarily for applications like thick metal cutting and welding. Ring-core fiber combiners enable efficient multi-channel laser combining, improving processing efficiency and quality.

[0004] Loop-core fiber combiners can disperse the power load through the center and outer ring beams, reducing nonlinear effects and breaking through the power limit of single-core fibers. However, in existing technologies, due to the manufacturing process and the selection of the double cladding of the output fiber, crosstalk can occur between the center and outer ring beams, affecting the performance of the loop-core fiber combiner. Utility Model Content

[0005] This utility model provides an optical fiber combiner, a laser, and laser processing equipment, which solves the problem of crosstalk between the center light and the outer ring light of the optical fiber combiner, improves the nonlinear effect of the optical fiber combiner, and enhances the performance of the optical fiber combiner.

[0006] According to a first aspect of the present invention, an optical fiber combiner is provided, comprising an input optical fiber bundle and an output optical fiber connected to the input optical fiber bundle. The output optical fiber comprises a core, a first cladding, and a second cladding arranged sequentially from the center outwards. The first cladding and the second cladding are annular. The first cladding and the core have different refractive indices, and the second cladding and the first cladding have different refractive indices.

[0007] The input fiber bundle includes a central input fiber and multiple outer ring input fibers, which together form an outer ring input fiber group. The core of the output fiber overlaps with the central input fiber of the input fiber bundle, the second cladding of the output fiber overlaps with the outer ring input fiber group of the input fiber bundle, and the second cladding of the output fiber overlaps with the central input fiber of the input fiber bundle.

[0008] Optionally, the second cladding cross-section of the output optical fiber is circular, the inner diameter of the second cladding of the output optical fiber is D2, and the outer diameter of the central input optical fiber of the input optical fiber bundle is D1, where D1 > D2.

[0009] Optionally, the output optical fiber further includes a third cladding and a coating layer, or the output optical fiber further includes a third cladding, a fourth cladding, and a coating layer.

[0010] Optionally, the second cladding includes a first sub-cladding, a second sub-cladding, and a third sub-cladding arranged sequentially outward from the center of the output fiber, wherein the first sub-cladding and the second sub-cladding have different refractive indices, and the third sub-cladding and the second sub-cladding have different refractive indices.

[0011] Optionally, the central input fiber includes a core and a cladding, and the outer diameter of the central input fiber is the outer diameter of the cladding.

[0012] Optionally, the first end of the input fiber bundle includes a fiber core, a cladding, and a coating layer, and the second end of the input fiber bundle includes a fiber core and a partial cladding. The input fiber bundle is connected to the output fiber through a fiber combining section. At least a portion of the cladding of the input fiber bundle near the fiber combining section includes a first tapered structure. Before tapering, the fiber core diameters of the first and second ends of the input fiber bundle are the same.

[0013] The fiber bundler includes a fiber optic sleeve, and at least a portion of the first tapered structure is located within the fiber optic sleeve.

[0014] Optionally, the diameters of the fiber core, the first cladding, the second cladding, and the third cladding within the output optical fiber are constant, the input fiber bundle is connected to the output optical fiber through an optical fiber bundle combiner, and at least a portion of the third cladding or the fourth cladding near the optical fiber bundle combiner includes a second conical structure.

[0015] Optionally, the region containing the second conical structure includes only the fiber core, the first cladding, the second cladding, and a portion of the third cladding; or, the region containing the second conical structure includes only the fiber core, the first cladding, the second cladding, the third cladding, and a portion of the fourth cladding.

[0016] According to a second aspect of the present invention, a laser is provided, comprising an optical fiber combiner as described in any of the first aspects and a laser generating mechanism having the same number of input optical fibers as the optical fiber combiner, wherein the output end of the laser generating mechanism is connected to the first end of the input optical fibers.

[0017] According to a third aspect of the present invention, a laser processing apparatus is provided, comprising the laser described in the second aspect.

[0018] The fiber optic combiner provided in this embodiment disperses the power load and reduces the local power density by using an input fiber bundle including a central input fiber and multiple outer ring input fibers at the input end. Furthermore, by using a multi-clad output fiber at the output end, and designing the first cladding and core of the output fiber to have different refractive indices, and the second cladding and first cladding to have different refractive indices, the central input light is transmitted in the core, while the outer ring input light is transmitted in the second cladding. The two are isolated by the first cladding, thereby solving the problem of crosstalk between the central light and the outer ring light and improving the nonlinear effect of the fiber optic combiner.

[0019] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the structure of an optical fiber combiner provided in an embodiment of this utility model;

[0022] Figure 2 A schematic diagram of the structure of the output optical fiber in an optical fiber combiner provided in this embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the arrangement of the output end face structure of the input fiber bundle when the number of outer ring input optical fibers is six, provided for an embodiment of this utility model;

[0024] Figure 4 A schematic diagram of the structure of the input end face of the output optical fiber provided in an embodiment of this utility model;

[0025] Figure 5 A schematic diagram of the connection position of the fiber bundle combiner when the number of outer ring input optical fibers is six, provided for an embodiment of this utility model;

[0026] Figure 6 A schematic diagram of the connection position of the fiber bundle combiner when the number of outer ring input fibers is six, provided for another embodiment of this utility model;

[0027] Figure 7 A schematic diagram of the output optical fiber in another optical fiber combiner provided in this embodiment of the present invention;

[0028] Figure 8 A schematic diagram of the output optical fiber in another optical fiber combiner provided in this embodiment of the utility model;

[0029] Figure 9 A schematic diagram of the structure of the input fiber bundle in an optical fiber combiner provided in this embodiment of the present invention;

[0030] Figure 10 A schematic diagram of another output fiber end face provided in an embodiment of this utility model;

[0031] Figure 11 This is a schematic diagram of the arrangement of the end face structure of an input fiber bundle with four outer ring input fibers, provided for an embodiment of this utility model. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] Figure 1 A schematic diagram of the structure of an optical fiber combiner provided in an embodiment of this utility model is shown below. Figure 1 As shown, the fiber optic combiner includes an input fiber bundle 10 and an output fiber 30 that is connected to the input fiber bundle 10, wherein the first end of the input fiber bundle 10 is used to receive the beam to be combined. Figure 1 The cladding structure of the output fiber is for illustrative purposes only and does not represent the actual cladding size ratio. Figure 2A schematic diagram of the output optical fiber in an optical fiber combiner provided in this embodiment of the present invention is shown below. Figure 2 As shown, the output optical fiber 30 includes a core 301, a first cladding 302, and a second cladding 303 arranged sequentially from the center outwards. The first cladding 302 and the second cladding 303 are ring-shaped, and the ring can be circular, elliptical, triangular, rectangular, or racetrack-shaped, etc. In specific implementation, it can be designed according to the actual optical fiber structure. The first cladding 302 and the core 301 have different refractive indices, and the second cladding 303 and the first cladding 302 have different refractive indices, so as to achieve precise control of the optical transmission characteristics, so that the input light in the input optical fiber bundle 10 can accurately enter the corresponding core or cladding of the output optical fiber 30.

[0035] Further reference Figure 1 The input fiber bundle 10 includes a central input fiber 102 and multiple outer ring input fibers 101. Figure 1 (Only two are shown as an example) Multiple outer ring input fibers 101 constitute an outer ring input fiber group, wherein the central input fiber 102 and the outer ring input fibers 101 can have different numerical apertures to form a ring core structure, which is beneficial to distribute the power load, thereby reducing the local power density and reducing nonlinear effects.

[0036] Furthermore, the core 301 of the output fiber 30 overlaps with the central input fiber 102 of the input fiber bundle 10, the second cladding 303 of the output fiber 30 overlaps with the outer ring input fiber group of the input fiber bundle 10, and the second cladding 303 of the output fiber 30 overlaps with the central input fiber 102 of the input fiber bundle 10. Figure 3 This is a schematic diagram illustrating the arrangement of the output end face structure of the input fiber bundle when the number of outer ring input optical fibers is six, as provided in an embodiment of this utility model. Figure 4 This is a schematic diagram of the structure of the input end face of the output optical fiber provided in an embodiment of the present invention. Figure 5 This is a schematic diagram illustrating the connection position of the fiber combiner when the number of outer ring input fibers is six, as provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of the connection position of the fiber combiner when the number of outer ring input fibers is six, according to another embodiment of the present invention. Figure 5 The view shown is along the direction from the input fiber to the output fiber. Figure 6 This is a view showing the direction along the output fiber towards the input fiber. For example... Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, during optical transmission, the core layer 1021 of the input fiber bundle 10 is aligned with the center of the core 301 of the output fiber 30, allowing the central input light to propagate within the core 301 of the output fiber. The outer ring input fiber bundle overlaps with the second cladding 303 of the output fiber, allowing the outer ring input light to propagate within the second cladding 303 of the output fiber. Since the first cladding 302 and the core 301 of the output fiber have different refractive indices, and the second cladding 303 and the first cladding 302 have different refractive indices, the first cladding 302 can isolate the central input light in the core 301 and the outer ring input light in the second cladding 303, thus avoiding crosstalk between the central input light and the outer ring input light.

[0037] This invention utilizes an input fiber bundle including a central input fiber and multiple outer ring input fibers at the input end, thereby dispersing the power load and reducing the local power density. Furthermore, by using a multi-clad output fiber at the output end, and designing the first cladding and core of the output fiber to have different refractive indices, and the second cladding and first cladding to have different refractive indices, the central input light is transmitted in the core, while the outer ring input light is transmitted in the second cladding. The two are isolated by the first cladding, thus solving the problem of crosstalk between the central and outer ring lights and improving the nonlinear effect of the fiber combiner.

[0038] In an alternative embodiment, Figure 7 A schematic diagram of the output optical fiber in another optical fiber combiner provided in this embodiment of the present invention is shown below. Figure 7 As shown, the output optical fiber 30 further includes a third cladding layer 304 and a coating layer 306, or, Figure 8 A schematic diagram of the output optical fiber in another optical fiber combiner provided in this embodiment of the present invention is shown below. Figure 8 As shown, the output optical fiber 30 further includes a third cladding layer 304, a fourth cladding layer 305, and a coating layer 306. All embodiments of this utility model are based on... Figure 8 The output optical fiber shown is explained below.

[0039] Optionally, continue to refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 The second cladding 303 of the output optical fiber has a circular cross-section, and the inner diameter of the second cladding 302 of the output optical fiber is D2. The outer diameter of the central input optical fiber of the input optical fiber bundle is D1, and D1 > D2. The central input optical fiber includes a core layer 1021 and a cladding 1022, and the outer diameter of the central input optical fiber is the same as the outer diameter of the output cladding 1022, i.e., the diameter of the cladding 1022 is D1.

[0040] Optionally, the thickness of the first cladding layer is 5-40 μm, preferably 15-25 μm.

[0041] Specifically, such as Figure 5 and Figure 6 As shown, the core layer 1021 of the central input fiber overlaps with the core layer 301 of the output fiber. That is, during the coupling process between the input and output fibers, the centers of the core layer 1021 of the central input fiber and the core layer 301 of the output fiber are aligned, allowing the central input light to propagate within the core layer 301 of the output fiber. The core layer 1011 of the outer ring input fiber overlaps with the second cladding 303 of the output fiber, allowing the outer ring input light to propagate within the second cladding 303 of the output fiber. However, due to the small size of optical fibers, it is difficult to perfectly align the cores of the input and output optical fibers. Therefore, by setting a first cladding 302 in the output optical fiber and making the cladding 1022 of the central input optical fiber overlap with the first cladding 302 and the second cladding 303 of the output optical fiber, that is, the diameter D1 of the cladding 1022 of the central input optical fiber is larger than the diameter D2 of the first cladding 302 of the output optical fiber, even if the core 301 of the output optical fiber and the core layer 1021 of the central input optical fiber are not perfectly aligned, the first cladding 302 can still confine the light of the core layer 1021 of the central input optical fiber within the first cladding 302. This avoids the problem of crosstalk between the central input light and the outer ring input light, improves the tolerance when splicing the input and output optical fibers, and reduces the difficulty of the process.

[0042] Optionally, Figure 9 A schematic diagram of the structure of the input fiber bundle in an optical fiber combiner provided in this embodiment of the present invention is shown below. Figure 9 As shown, the first end of the input fiber bundle 10 ( Figure 9 The middle left side includes fiber core 1011 / 1021, cladding 1012 / 1022 and coating 1013 / 1023, and the second end of the input fiber bundle 10 ( Figure 9 The right side (in the middle) includes the core 1011 / 1021 and part of the cladding 1012 / 1022. For example... Figure 1 As shown, the input fiber bundle 10 is connected to the output fiber 30 via the fiber combiner 20. At least a portion of the cladding 1012 / 1022 of the input fiber bundle 10 near the fiber combiner 20 includes a first tapered structure, and the cores 1011 / 1021 of the first and second ends of the input fiber have the same diameter before tapering. Figure 9 As shown, the fiber optic bundle combiner 20 includes a fiber optic sleeve 201, and at least a portion of the first tapered structure and the core of the second end of the input fiber are located inside the fiber optic sleeve 201.

[0043] Specifically, refer to Figure 9The input fiber bundle 10 of the fiber combiner includes a central input fiber 102 and multiple outer ring input fibers 101. The first ends of both the central input fiber 102 and the outer ring input fibers 101 include a core 1011 / 1021, a cladding 1012 / 1022, and a coating 1013 / 1023. The second ends of both the central input fiber 102 and the outer ring input fibers 101 include a core 1011 / 1021 and a portion of the cladding 1012 / 1022. For example, the multiple outer ring input fibers 101 can be identical multimode fibers with dimensions of 34 / 130 μm, meaning the core 1011 of the outer ring input fiber 101 has a diameter of 34 μm, the cladding 1012 has a diameter of 130 μm, and the numerical aperture of the fiber is 0.1. The center input fiber 102 can be a multimode fiber with a size of 50 / 290μm, that is, the core layer 1021 of the center input fiber 102 has a diameter of 50μm, the cladding layer 1022 has a diameter of 290μm, and the fiber numerical aperture is 0.15.

[0044] Further, the central input fiber 102 and the outer ring input fiber 101 are respectively laser-etched, so that at least a portion of the cladding 1012 / 1022 near the fiber combining section includes a first tapered structure, and the core 1011 / 1021 at the first and second ends of the input fiber has the same diameter before tapering. For example, after processing, the outer ring input fiber 101 retains a core 1011 diameter of 34 μm, and the cladding 1012 has a tapered structure with an end face diameter of 100 μm. After processing, the central input fiber 102 retains a core 1021 diameter of 50 μm, and the cladding 1022 has a tapered structure with an end face diameter of 100 μm.

[0045] The center input fiber 102 and the outer ring input fiber 101 are sequentially inserted into the fiber optic sleeve of the fiber bundle section, wherein at least a portion of the first tapered structure is located inside the fiber optic sleeve. Then, the fiber bundle section is subjected to fused tapering treatment to form a ring-core fiber bundle.

[0046] Optionally, such as Figure 8 As shown, the core 301, the first cladding 302, the second cladding 303 and the third cladding 304 have constant diameters within the output optical fiber. The input optical fiber bundle is connected to the output optical fiber through the optical fiber bundle combiner. The fourth cladding 305, in at least a portion of the area near the optical fiber bundle combiner, includes a second conical structure.

[0047] Specifically, the second conical structure can be processed by laser engraving to ensure that the diameters of the core 301, the first cladding 302, the second cladding 303, and the third cladding 304 within the output optical fiber 30 remain constant. For example, in one embodiment, the dimensions of the output optical fiber 30 are 50 / 70 / 170 / 190 / 390 / 560 μm, that is, the diameter of the core 301 is 50 μm, the diameter of the first cladding 302 is 70 μm, the diameter of the second cladding 303 is 170 μm, the diameter of the third cladding 304 is 190 μm, the diameter of the fourth cladding 305 is 390 μm, the diameter of the coating layer 306 is 560 μm, and the numerical aperture of the output optical fiber 30 is 0.22. Before forming the second conical structure, the coating layer 306 of a portion of the output optical fiber 30 is removed, and then the output optical fiber is laser-etched. The diameters of the core 301, the first cladding 302, the second cladding 303 and the third cladding 304 remain unchanged after the treatment. The fourth cladding 305 has a conical structure with an input end face diameter of 350 μm.

[0048] In an alternative embodiment, such as Figure 7 As shown, the area where the second conical structure is located includes only the fiber core 301, the first cladding 302, the second cladding 303, and part of the third cladding 304. The third cladding 304 can be processed by laser engraving to ensure that the diameters of the fiber core 301, the first cladding 302, and the second cladding 303 are constant within the output fiber 30.

[0049] Optionally, such as Figure 8 and Figure 9 As shown, the output diameter of the fiber combiner is d1, the input diameter of the second conical structure is d2, and |d1-d2|≤5μm.

[0050] Specifically, before splicing the loop-core fiber bundle (formed by the input fiber bundle and the fiber combiner) with the output fiber, the loop-core fiber bundle and the output fiber need to be cut to ensure that the absolute difference between the output end diameter of the fiber combiner and the input section diameter of the second tapered structure is less than 5 μm. This avoids excessive loss due to mismatch during splicing. For example, if the input end diameter of the second tapered structure at the connection between the output fiber and the fiber combiner is 420 μm, the output end diameter of the fiber combiner also needs to be calculated based on 420 μm, with an error between the two within ±5 μm.

[0051] In an alternative embodiment, when the output optical fiber is cut, the length of the second tapered structure is greater than or equal to 79900 μm and less than or equal to 80100 μm.

[0052] In an alternative embodiment, Figure 10 This is a schematic diagram of another output fiber end face provided in an embodiment of the present invention, wherein the second cladding includes a first sub-cladding 3031, a second sub-cladding 3032 and a third sub-cladding 3033 arranged sequentially outward from the center of the output fiber. The first sub-cladding 3031 and the third sub-cladding 3033 have the same refractive index, and the second sub-cladding 3032 and the first cladding 302 have the same refractive index.

[0053] Specifically, the light in the central input fiber is confined to the core 301 by the first cladding 302. Since the second cladding includes a first sub-cladding 3031, a second sub-cladding 3032, and a third sub-cladding 3033 arranged sequentially outward from the center of the output fiber, and the first sub-cladding 3031 and the third sub-cladding 3033 have the same refractive index, and the second sub-cladding 3032 and the first cladding 302 have the same refractive index, the light in the outer ring input fiber is transmitted in the first sub-cladding 3031 and the third sub-cladding 3033, while there is almost no light in the second sub-cladding 3032. Therefore, at the output end of the output fiber, a solid light spot generated by the core and two annular light spots generated by the first sub-cladding and the third sub-cladding, respectively, will be formed.

[0054] In an alternative embodiment, the number of outer ring input fibers is greater than or equal to three, and the fiber bundle includes a central input fiber and at least three outer ring input fibers closely arranged around the central input fiber. Figure 11 This invention provides a schematic diagram of the arrangement of an input fiber bundle end face structure with four input fibers in the outer ring, as shown in the embodiment of the present invention. Figure 11 As shown, the central input fiber 102 is tightly surrounded by four outer ring input fibers 101. This tight arrangement makes it easier to shape the fiber bundle end face and prevents it from easily spreading out during fused tapering.

[0055] This utility model embodiment also provides a laser, including any of the fiber optic combiners in the above embodiments and a laser generating mechanism with the same number of input fibers as the fiber optic combiner, wherein the output end of the laser generating mechanism is connected to the first end of the input fiber.

[0056] This utility model embodiment also provides a laser processing device, including the laser described above.

[0057] This embodiment of the invention does not require special optical components to compress the divergence angle of the laser device, avoids complex optical system structures, reduces manufacturing costs, and has the advantages of simple structure, easy manufacturing, and strong stability.

[0058] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A fiber combiner, comprising: The fiber includes an input fiber bundle and an output fiber that is connected to the input fiber bundle. The output fiber includes a core, a first cladding, and a second cladding arranged sequentially from the center outwards. The first cladding and the second cladding are annular. The first cladding and the core have different refractive indices, and the second cladding and the first cladding have different refractive indices. The input fiber bundle includes a central input fiber and multiple outer ring input fibers, which together form an outer ring input fiber group. The core of the output fiber overlaps with the central input fiber of the input fiber bundle, the second cladding of the output fiber overlaps with the outer ring input fiber group of the input fiber bundle, and the second cladding of the output fiber overlaps with the central input fiber of the input fiber bundle.

2. The fiber combiner of claim 1, wherein, The second cladding cross-section of the output optical fiber is circular, the inner diameter of the second cladding of the output optical fiber is D2, and the outer diameter of the central input optical fiber of the input optical fiber bundle is D1, where D1 > D2.

3. The fiber combiner of claim 1, wherein, The output optical fiber further includes a third cladding and a coating layer, or the output optical fiber further includes a third cladding, a fourth cladding, and a coating layer.

4. The fiber combiner of claim 1, wherein, The second cladding includes a first sub-cladding, a second sub-cladding, and a third sub-cladding arranged sequentially outward from the center of the output optical fiber. The first sub-cladding and the second sub-cladding have different refractive indices, and the third sub-cladding and the second sub-cladding have different refractive indices.

5. The fiber combiner of claim 1, wherein, The central input fiber includes a core and a cladding, and the outer diameter of the central input fiber is the outer diameter of the cladding.

6. The fiber combiner of claim 1, wherein, The first end of the input fiber bundle includes a fiber core, a cladding, and a coating layer. The second end of the input fiber bundle includes a fiber core and a partial cladding. The input fiber bundle is connected to the output fiber through a fiber combining section. At least a portion of the cladding of the input fiber bundle near the fiber combining section includes a first tapered structure. Before tapering, the fiber core diameters of the first and second ends of the input fiber bundle are the same. The fiber bundler includes a fiber optic sleeve, and at least a portion of the first tapered structure is located within the fiber optic sleeve.

7. The fiber optic combiner according to claim 3, characterized in that, The core, the first cladding, the second cladding, and the third cladding have constant diameters within the output optical fiber. The input fiber bundle is connected to the output optical fiber through an optical fiber combiner. At least a portion of the third cladding or the fourth cladding near the optical fiber combiner includes a second conical structure.

8. The fiber optic combiner according to claim 7, characterized in that, The region containing the second conical structure includes only the fiber core, the first cladding, the second cladding, and a portion of the third cladding; or, the region containing the second conical structure includes only the fiber core, the first cladding, the second cladding, the third cladding, and a portion of the fourth cladding.

9. A laser, characterized in that, It includes the fiber optic combiner as described in any one of claims 1 to 8 and a laser generating mechanism having the same number of input fibers as the fiber optic combiner, wherein the output end of the laser generating mechanism is connected to the first end of the input fiber.

10. A laser processing device, characterized in that, Includes the laser as described in claim 9.

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