Laser output device and preparation method thereof, laser and laser processing device

Abstract

The invention belongs to the technical field of fiber laser synthesis, and discloses a laser output device and a preparation method thereof, a laser and a laser processing device. And the laser output device comprises an output head shell, an end cap and an optical fiber bundle group. The end cap is arranged in the output head shell; one ends of the plurality of optical fibers are tightly attached to form an optical fiber bundle group, the optical fiber bundle group is directly connected with the end cap, and the optical fiber bundle group is formed by tapering the plurality of optical fibers, or the optical fiber bundle group is formed by drawing a plurality of optical fiber preforms. The optical fiber bundle group is directly connected with the end cap, so that the light spot of the laser is no longer fixed as a single light spot, and the shape of the light spot can be adjusted at any time according to different scenes. The laser device and the laser processing device provided by the invention comprise the laser output device.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber laser synthesis, and in particular to a laser output device and a preparation method thereof, a laser, and a laser processing device. Background Art

[0002] In recent years, laser technology has emerged as a leader in industrial processing applications, gradually replacing traditional processes with its multiple advantages, including high precision, high efficiency, non-contact processing, wide applicability, and environmental protection and energy conservation. Lasers are generally Gaussian beams, meaning the beam intensity exhibits a Gaussian distribution in space. Such beams have a high energy intensity at the center and a gradually decreasing intensity along the radial direction, following a Gaussian profile.

[0003] Conventional lasers can generally only output a fixed and limited-variable laser. To achieve precise control of the light spot, it is necessary to change the phase and amplitude of the light beam to adjust the size and shape of the light spot. Related technologies use galvanometers or relatively complex coherent lasers to adjust the size and shape of the light spot. The above adjustment process requires the use of a specialized system vendor to develop a control system so that users can adapt to various application scenarios according to different lasers and systems. This results in a low degree of liberalization in laser applications, and the light spot cannot be of any shape. At the same time, there is a dependence on specialized system developers, which not only increases costs, but also causes the homogenization of application processes within the industry. In addition, the layered model also makes it impossible for the laser to perfectly match application requirements, thereby greatly reducing the effectiveness of the laser.

[0004] Therefore, there is an urgent need for a laser output device and a preparation method thereof, as well as a laser device, to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a laser output device and its preparation method, a laser, and a laser processing device, aiming to solve the problem in the prior art that the laser spot size and shape are difficult to adjust and the adjustment cost is high.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A laser output device, comprising:

[0008] Output head housing;

[0009] an end cap, mounted in the output head housing;

[0010] A plurality of optical fibers, one end of which is tightly fitted to form an optical fiber bundle group, and the optical fiber bundle group is directly connected to the end cap, wherein the optical fiber bundle group is formed by taper-forming the plurality of optical fibers, or the optical fiber bundle group is formed by drawing a plurality of optical fiber preform rods.

[0011] In some possible implementations, the optical fiber bundle assembly further includes a sleeve, which is coated on the outside of one end of the multiple optical fibers that are tightly fitted.

[0012] In some possible implementations, the optical fiber includes a core and a cladding covering the core, and the cladding includes a first tapered structure.

[0013] In some possible implementations, the plurality of optical fibers are arranged in a rectangular array, a ring-core array, or a circular array.

[0014] In some possible embodiments, the sleeve includes a second conical structure, which includes an annular tube body and a hollow cone that are connected to each other. The optical fiber is sequentially passed through the annular tube body and the hollow cone. The small end of the hollow cone is connected to the end cap, and the large end of the hollow cone is connected to the annular tube body.

[0015] In some possible implementations, the cross-section of the sleeve along the vertical length direction is circular, symmetrical polygonal, or asymmetrical polygonal.

[0016] In some possible implementations, the multiple optical fibers in the optical fiber bundle group formed by drawing multiple optical fiber preforms are cylindrical or tapered.

[0017] A method for preparing a laser output device, the method comprising:

[0018] Provide multiple optical fibers, a sleeve and an end cap;

[0019] Inserting a plurality of optical fibers into the sleeve;

[0020] Performing a fusion taper process on the sleeve to form an optical fiber bundle group;

[0021] directly connecting the optical fiber bundle group to the end cap;

[0022] The optical fiber bundle group and the end cap are mounted on the output head housing.

[0023] In some possible implementations, before inserting the plurality of optical fibers into the sleeve, the method further includes: forming a first tapered structure on the cladding of the optical fiber, and the diameter of the core of the optical fiber remains unchanged.

[0024] In some possible implementations, a method of forming the first cone-shaped structure includes at least one of laser writing, polishing, and grinding.

[0025] In some possible implementations, the outer peripheral side of the cladding is covered with a coating layer. Before the cladding forms the first tapered structure, the further step further includes: stripping the coating layer at one end of the optical fiber where the first tapered structure is located.

[0026] A method for preparing a laser output device, the method comprising:

[0027] Providing a plurality of optical fiber preform rods and fitting them tightly together, then drawing and cutting them to obtain a plurality of tightly fitting optical fibers to form an optical fiber bundle group;

[0028] directly connecting the optical fiber bundle group to the end cap;

[0029] The optical fiber bundle and the end cap are mounted on the output head housing.

[0030] A laser comprises a laser light source and the laser output device described in any one of the above schemes, wherein the output end of the laser light source is connected to ends of multiple optical fibers of the laser output device away from end caps.

[0031] A laser processing device comprises the above-mentioned laser.

[0032] Beneficial effects of the present invention:

[0033] The laser output device provided by the present invention is configured with multiple optical fibers, one end of which is tightly fitted to form an optical fiber bundle group. The optical fiber bundle group is directly connected to the end cap for output, so that the laser spot is no longer fixed to a single spot. The number of optical fibers and the type of specific arrangement array can be set as needed. The shape of the light spot can be adjusted at any time according to different scenarios to achieve uniform preheating, heating and annealing effects, with high operational freedom. The optical fiber bundle group is integrated with the output head, and no transition optical fiber is required. The structure is simple, the production cost is low, and the stability of use is high.

[0034] The present invention also provides a method for preparing a laser output device, which is used to prepare the above-mentioned laser output device. Multiple optical fibers and a sleeve form a fiber bundle group, and the fiber bundle group is directly connected to the end cap, so that the laser light spot is no longer fixed to a single light spot. The light spot shape can be adjusted at any time according to different scenarios to achieve uniform preheating, heating and annealing effects; the sleeve is subjected to a melt taper treatment, and the sleeve and multiple optical fibers are tapered to form a fiber bundle group, and the process is simple; multiple optical fibers are inserted into the sleeve to facilitate position alignment when the optical fibers are connected to the end cap, reducing processing difficulty; the fiber bundle group and the output head are integrated into a design, and no transition optical fiber is required, the manufacturing process is simple, and the connection stability is high.

[0035] The present invention also provides a method for preparing a laser output device, which is used to prepare the above-mentioned laser output device. A plurality of optical fiber preform rods are simultaneously subjected to wire drawing processing. The fiber bundle group after wire drawing processing is directly connected to the end cap, so that the laser spot is no longer fixed to a single spot. The spot shape can be adjusted at any time according to different scenarios to achieve uniform preheating, heating and annealing effects; the fiber bundle group and the output head are integrated into a design, and no transition optical fiber is required. The manufacturing process is simple and the connection stability is high.

[0036] The present invention also provides a laser, including a laser light source and the above-mentioned laser output device. The output end of the laser light source is connected to the end of the optical fiber of the laser output device away from the end cap. Multiple optical fibers form an optical fiber bundle group, so that the laser spot is no longer fixed to a single spot. The number of optical fibers and the type of specific arrangement array can be set as needed. The spot shape can be adjusted at any time according to different scenarios to achieve uniform preheating, heating and annealing effects, with high operational freedom.

[0037] The present invention also provides a laser processing device, including the above-mentioned laser, wherein a plurality of optical fibers form an optical fiber bundle group directly connected to the end cap, so that the light spot of the laser processing device is no longer fixed to a single light spot. The number of optical fibers and the type of specific arrangement array can be set as needed, and the shape of the light spot can be adjusted at any time according to different scenarios to achieve uniform preheating, heating and annealing effects, with high operational freedom. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of a laser output device provided by an embodiment of the present invention;

[0039] Figure 2 is a cross-sectional view along the length direction of an optical fiber provided by an embodiment of the present invention;

[0040] Figure 3 is a longitudinal cross-sectional view of a 3×3 array of optical fiber bundles provided by an embodiment of the present invention along a vertical length direction;

[0041] Figure 4 is a schematic structural diagram of an optical fiber bundle group provided by an embodiment of the present invention;

[0042] Figure 5 1 is a schematic structural diagram of an output head housing provided by an embodiment of the present invention;

[0043] Figure 6 This is a light spot distribution diagram when the optical fibers provided by an embodiment of the present invention are distributed in a 3×3 array;

[0044] Figure 7 It is a schematic structural diagram of a laser output device provided by an embodiment of the present invention.

[0045] In the picture:

[0046] 100, output head housing; 200, end cap; 300, optical fiber bundle group; 310, optical fiber; 311, fiber core; 312, cladding; 3121, first tapered structure; 313, coating layer; 320, sleeve. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0048] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0049] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0050] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0051] like Figures 1 to 5As shown, this embodiment provides a laser output device, which includes an output head housing 100, an end cap 200 and an optical fiber bundle group 300. The end cap 200 is installed in the output head housing 100; a plurality of optical fibers 310, one end of the plurality of optical fibers 310 is tightly fitted to form an optical fiber bundle group 300, and the optical fiber bundle group 300 is directly connected to the end cap 200, wherein the optical fiber bundle group 300 is formed by tapering the plurality of optical fibers 310, or the optical fiber bundle group 300 is formed by drawing a plurality of tightly fitted optical fiber preform rods. It should be noted that a plurality of tightly fitted optical fiber preform rods are drawn to obtain a plurality of tightly fitted optical fibers 310 to form an optical fiber bundle group 300, without the need for a sleeve, and the optical fiber bundle group 300 is directly connected to the end cap 200. It should be noted that the tight fit can be that there is a gap between the two, but the gap is filled, or there is no gap between the two.

[0052] The laser output device of this embodiment is provided with multiple optical fibers 310, one end of which is tightly fitted to form a fiber bundle group 300. The fiber bundle group 300 is directly connected to the end cap 200 for output, so that the laser spot is no longer fixed to a single spot. The number of optical fibers 310 and the type of specific arrangement array can be set as needed. The shape of the light spot can be adjusted at any time according to different scenarios to achieve uniform preheating, heating and annealing effects, etc., with high operational freedom. The fiber bundle group 300 and the output head (i.e., the end cap 200) are integrated into a design without the need for a transition optical fiber, resulting in a simple structure, low production cost, and high stability in use.

[0053] In one possible embodiment, the optical fiber bundle assembly 300 further includes a sleeve 320, which is wrapped around the outer side of one end of the multiple optical fibers 310 that is tightly fitted. The multiple optical fibers 310 are bundled through the sleeve 320, which facilitates alignment of the optical fibers 310 when connected to the end cap 200, thereby reducing processing difficulty.

[0054] like Figure 2 As shown, optionally, the optical fiber 310 includes a core 311 and a cladding 312 covering the core 311, and the cladding 312 includes a first tapered structure 3121. By providing the cladding 312 of the optical fiber 310 with the first tapered structure 3121, the diameter ratio of the core 311 to the cladding 312 can be adjusted within the tapered section, thereby changing the numerical aperture of the core 311 and adjusting the performance of the optical fiber 310. In addition, the optical fiber bundle 300 is directly connected to the end cap 200, avoiding the constraint of the output optical fiber on the adjustment of the core-to-cladding ratio of the optical fiber 310. The above adjustment of the performance of the optical fiber 310 can be directly output without the need for special optical components, resulting in a simple structure, low manufacturing cost, and high stability in use.

[0055] Optionally, the multiple optical fibers 310 are arranged in a rectangular array, a ring core array, or a circular array. Such an arrangement can transform the energy distribution of the laser from a traditional Gaussian type to a flat-top type or a ring type, so as to achieve uniform preheating, heating, and annealing effects. For example, the rectangular array can be an M×N array or an N×N array; the ring core array can include an optical fiber 310 located in the center and multiple optical fibers 310 uniformly arranged circumferentially along the optical fiber 310; the circular array can be configured so that the multiple optical fibers 310 are distributed in a circular manner. In other embodiments, the arrangement shape of the multiple optical fibers 310 can be set according to the shape of the desired output light spot. For example, the multiple optical fibers 310 can be distributed in a disordered state, as long as they can be passed through the sleeve 320 and form a fiber bundle group 300 with the sleeve 320.

[0056] Preferably, when multiple optical fibers 310 are arranged in an array, the outer surfaces of adjacent optical fibers 310 are tangent to or abut against each other. For example, the cross-section of an optical fiber 310 along its vertical length may be circular or square. When the longitudinal cross-section is circular, the outer surfaces of adjacent optical fibers 310 are tangent to each other, and when the longitudinal cross-section is square, the outer surfaces of adjacent optical fibers 310 abut against each other.

[0057] In this embodiment, multiple optical fibers 310 are arranged in an N×N array. This arrangement ensures a uniform distribution of the optical fibers 310. After the multiple optical fibers 310 are threaded through the sleeve 320 and connected to the fiber bundle assembly 300 and end cap 200, the multiple optical fibers 310 are less likely to be misaligned or damaged. Optionally, the N×N array can be a 3×3 array, a 5×5 array, or a 9×9 array. In other embodiments, the N×N array can be configured as a 7×7 array or other array, as needed.

[0058] like Figure 1 and Figure 4 As shown, in this embodiment, the sleeve 320 includes a second tapered structure, which comprises an interconnected annular tube and a hollow cone. The optical fiber 310 is sequentially inserted into the annular tube and the hollow cone. The small end of the hollow cone is connected to the end cap 200, and the large end of the hollow cone is connected to the annular tube. During actual assembly, the size of the end cap 200 is often larger than the small end of the hollow cone. By connecting the small end of the hollow cone to the end cap 200, the connection area between the hollow cone and the end cap 200 is increased, making the connection stable and reliable. In other embodiments, the sleeve 320 can be configured as a circular or square structure, and its specific shape can be set as needed.

[0059] In a possible embodiment, the cross section of the sleeve 320 along the vertical length direction is circular, symmetrical polygonal or asymmetrical polygonal. For example, the cross section of the sleeve 320 along the vertical length direction can be square, triangular or regular pentagonal, etc., which can be set as needed.

[0060] In some possible implementations, the end cap is a quartz end cap and the sleeve is a glass sleeve. This arrangement can effectively improve the convenience of connecting the end cap and the sleeve.

[0061] In a possible implementation, the multiple optical fibers 310 in the optical fiber bundle group 300 formed by drawing multiple optical fiber preforms are cylindrical or conical.

[0062] This embodiment also provides a method for preparing a laser output device, which can be used to prepare the above-mentioned laser output device. The preparation method includes the following steps:

[0063] S1. Provide multiple optical fibers 310, a sleeve 320, and an end cap 200;

[0064] S2, inserting multiple optical fibers 310 into the sleeve 320;

[0065] S3, performing a fusion taper process on the sleeve 320 to form an optical fiber bundle group 300;

[0066] S4, directly connecting the optical fiber bundle 300 to the end cap 200;

[0067] S5 , installing the optical fiber bundle 300 and the end cap 200 on the output head housing 100 .

[0068] In the preparation method of the laser output device provided in this embodiment, the optical fiber bundle group 300 is directly connected to the end cap 200, so that the laser spot is no longer fixed to a single spot, and the spot shape can be adjusted at any time according to different scenarios to achieve uniform preheating, heating and annealing effects; the sleeve 320 is subjected to a melt taper treatment, and the sleeve 320 and multiple optical fibers 310 are tapered to form the optical fiber bundle group 300, which is a simple process; the multiple optical fibers 310 are inserted into the sleeve 320, which facilitates the position alignment of the optical fibers 310 when connected to the end cap 200, reducing the processing difficulty; the optical fiber bundle group 300 and the output head (i.e., the end cap 200) are integrated into a design, without the need for a transition optical fiber, the manufacturing process is simple, and the connection stability is high.

[0069] In some possible embodiments, before inserting the plurality of optical fibers 310 into the sleeve 320, the process further includes forming a first tapered structure 3121 in the cladding 312 of the optical fibers 310, while maintaining the diameter of the core 311 of the optical fibers 310. By forming the first tapered structure 3121 in the cladding 312 of the optical fibers 310, the diameter ratio of the core 311 to the cladding 312 can be adjusted within the tapered section, thereby changing the numerical aperture of the core 311 and adjusting the performance of the optical fibers 310. Furthermore, the optical fiber bundle 300 is directly connected to the end cap 200 via optical fusion splicing, eliminating the constraints imposed by the output optical fiber on the adjustment of the core-to-cladding ratio of the optical fibers 310. This allows the aforementioned performance adjustments of the optical fibers 310 to be directly output, eliminating the need for special optical components, simplifying the manufacturing process, and achieving high connection stability.

[0070] Optionally, the outer periphery of the cladding 312 is covered with a coating 313. Before forming the first tapered structure 3121, the cladding 312 further includes: stripping the coating 313 from one end of the optical fiber 310 where the first tapered structure 3121 is located. By stripping the coating 313, the cladding 312 is exposed, facilitating subsequent processing. Exemplarily, the coating 313 can be stripped using a chemical stripping method, i.e., removing the coating 313 by chemically dissolving a substance, or a mechanical stripping method, i.e., removing the coating 313 by mechanical means.

[0071] In this embodiment, the method for forming the first tapered structure 3121 includes at least one of laser engraving, polishing, and grinding. Processing the optical fiber 310 by laser engraving, polishing, or grinding can ensure that the core 311 of the optical fiber 310 remains unchanged after the processing, facilitating precise control of the diameter ratio of the core 311 to the cladding 312 of the optical fiber 310.

[0072] During preparation, multiple optical fibers 310 can optionally be arranged in an N×N array. This arrangement ensures uniform distribution of the optical fibers 310, preventing them from becoming misaligned or damaged when the optical fiber bundle 300 is fusion-spliced ​​with the end cap 200. For example, the N×N array can be a 3×3 array, a 5×5 array, or a 9×9 array. In other embodiments, the N×N array can be a 7×7 array, or other array, as needed.

[0073] In this embodiment, after the ferrule 320 is subjected to the fusion taper process and before the optical fiber bundle 300 is formed, the ferrule 320 is further cut. After the ferrule 320 is subjected to the fusion taper process, the diameter of the ferrule 320 is scanned to obtain diameter values ​​at different positions. The ferrule 320 is then cut at the desired diameter value to form the optical fiber bundle 300.

[0074] like Figure 6 The figure shows the light spot distribution diagram when the optical fibers 310 are arranged in a 3×3 array. In this embodiment, nine optical fibers 310 are arranged in a 3×3 array as an example. The specific preparation process includes:

[0075] S1. Provide nine optical fibers 310, a sleeve 320, and an end cap 200;

[0076] The diameter of the core 311 of the optical fiber 310 is 18 μm-22 μm, preferably 20 μm, the diameter of the cladding is 110 μm-150 μm, preferably 130 μm, and the numerical aperture of the optical fiber 310 is 0.06-0.09, preferably 0.075;

[0077] In this embodiment, the diameter of the core 311 of the optical fiber 310 is 20 μm, the diameter of the cladding is 130 μm, and the numerical aperture of the optical fiber 310 is 0.075. The optical fiber 310 is laser-written. After the laser writing process, the core 311 of the optical fiber 310 remains unchanged at 20 μm.

[0078] S2. A first tapered structure 3121 is formed on the cladding 312 of the optical fiber 310. The diameter of the core 311 of the optical fiber 310 remains unchanged at 20 μm. Multiple optical fibers 310 are arranged in an array and inserted into the sleeve 320. Specifically, nine optical fibers 310 are sequentially inserted into the sleeve 320 in a 3×3 array.

[0079] S3, performing a fusion taper process on the sleeve 320 to form a 3×3 array of optical fiber bundles 300;

[0080] S4. Directly fusion-splice the optical fiber bundle group 300 and the end cap 200. The size of the end cap 200 is Ø8×20 mm. Directly fusion-splice the optical fiber bundle group 300 arranged in a 3×3 array and the end cap 200.

[0081] S5 , installing the optical fiber bundle 300 and the end cap 200 on the output head housing 100 .

[0082] The present application also provides an embodiment in which a plurality of optical fiber preform rods (not shown) are drawn on a drawing tower and cut to obtain a plurality of optical fibers 310 that fit closely together, such as Figure 7 The plurality of optical fibers 310 shown form an optical fiber bundle 300 , and the optical fiber bundle 300 is directly connected to the end cap 200 without a ferrule.

[0083] This embodiment also provides a method for preparing a laser output device, comprising:

[0084] Providing a plurality of optical fiber preform rods for drawing and cutting to obtain a plurality of tightly fitted optical fibers 310 to form an optical fiber bundle group 300;

[0085] Connect the optical fiber bundle 300 directly to the end cap 200;

[0086] The optical fiber bundle 300 and the end cap 200 are mounted on the output head housing 100 .

[0087] In the method for preparing a laser output device provided in this embodiment, multiple optical fiber preforms are drawn and cut to obtain a plurality of tightly fitted optical fibers 310 to form an optical fiber bundle 300. The optical fiber bundle 300 is directly connected to the end cap 200, so that the laser spot is no longer fixed to a single spot. The spot shape can be adjusted at any time according to different scenarios to achieve uniform preheating, heating, and annealing effects. The optical fiber bundle 300 is integrated with the output head (i.e., the end cap 200), eliminating the need for transition optical fibers, simplifying the manufacturing process, and achieving high connection stability.

[0088] This embodiment further provides a laser, including a laser light source and the aforementioned laser output device, wherein the output end of the laser light source is connected to an end of multiple optical fibers 310 of the laser output device away from the end cap 200 .

[0089] In the laser provided in this embodiment, the output end of the laser light source is connected to the end of the optical fiber 310 of the laser output device away from the end cap 200. Multiple optical fibers 310 form an optical fiber bundle group 300, so that the laser spot is no longer fixed to a single spot. The number of optical fibers 310 and the type of specific arrangement array can be set as needed. The spot shape can be adjusted at any time according to different scenarios to achieve uniform preheating, heating and annealing effects, with a high degree of operational freedom.

[0090] This embodiment also provides a laser processing device, including the aforementioned laser. A plurality of optical fibers 310 forming an optical fiber bundle 300 are directly connected to an end cap 200. This eliminates the need for a fixed single spot in the laser processing device. The number of optical fibers and the type of their specific array arrangement can be customized, allowing for the adjustment of the spot shape to suit different scenarios, achieving uniform preheating, heating, and annealing effects. This provides a high degree of operational flexibility.

[0091] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A laser output device, characterized in that: include: Output head housing (100); An end cap (200) is installed in the output head housing (100); A plurality of optical fibers (310), one end of the plurality of optical fibers (310) being tightly fitted together to form an optical fiber bundle group (300), the optical fiber bundle group (300) being directly connected to the end cap (200), wherein the optical fiber bundle group (300) is formed by tapering the plurality of optical fibers (310), or the optical fiber bundle group (300) is formed by drawing a plurality of optical fiber preform rods.

2. The laser output device according to claim 1, wherein: The optical fiber bundle assembly (300) further includes a sleeve (320), and the sleeve (320) is coated on the outside of one end of the multiple optical fibers (310) that is tightly fitted.

3. The laser output device according to claim 1, wherein: The optical fiber (310) includes a core (311) and a cladding (312) covering the core (311), and the cladding (312) includes a first tapered structure (3121).

4. The laser output device according to claim 1, wherein: The plurality of optical fibers (310) are arranged in a rectangular array, a ring core array or a circular array.

5. The laser output device according to claim 1, wherein: The sleeve (320) includes a second conical structure, which includes an annular tube body and a hollow cone that are connected to each other. The optical fiber (310) is sequentially inserted into the annular tube body and the hollow cone. The small end of the hollow cone is connected to the end cap (200), and the large end of the hollow cone is connected to the annular tube body.

6. The laser output device according to claim 1, wherein: The cross section of the sleeve (320) along the vertical length direction is circular, symmetrical polygonal or asymmetrical polygonal.

7. The laser output device according to claim 1, wherein: The multiple optical fibers (310) in the optical fiber bundle group (300) formed by drawing multiple optical fiber preform rods are cylindrical or conical.

8. A method for preparing a laser output device, characterized in that: The preparation method comprises: Providing a plurality of optical fibers (310), a sleeve (320) and an end cap (200); Inserting a plurality of optical fibers (310) into the sleeve (320); Performing a fusion taper process on the sleeve (320) to form an optical fiber bundle group (300); directly connecting the optical fiber bundle group (300) to the end cap (200); The optical fiber bundle group (300) and the end cap (200) are mounted on the output head housing (100).

9. The method for preparing a laser output device according to claim 8, wherein: Before inserting the plurality of optical fibers (310) into the sleeve (320), the method further includes: forming a first tapered structure (3121) on the cladding (312) of the optical fiber (310), and the diameter of the core (311) of the optical fiber (310) remains unchanged.

10. The method for preparing a laser output device according to claim 9, wherein: The method of forming the first conical structure (3121) includes at least one of laser engraving, polishing and grinding.

11. The method for preparing a laser output device according to claim 9, wherein: The outer peripheral side of the cladding (312) is covered with a coating layer (313). Before forming the first tapered structure (3121), the cladding (312) further includes: stripping the coating layer (313) at one end of the optical fiber (310) where the first tapered structure (3121) is located.

12. A method for preparing a laser output device, characterized in that: The preparation method comprises: Providing a plurality of optical fiber preform rods for drawing and cutting to obtain a plurality of tightly fitted optical fibers (310) to form an optical fiber bundle group (300); directly connecting the optical fiber bundle group (300) to the end cap (200); The optical fiber bundle group (300) and the end cap (200) are mounted on the output head housing (100).

13. A laser, characterized in that: The invention comprises a laser light source and a laser output device according to any one of claims 1 to 7, wherein the output end of the laser light source is connected to one end of a plurality of optical fibers (310) of the laser output device away from an end cap (200).

14. A laser processing device, characterized in that: Comprising the laser of claim 13.

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