Fiber laser beam combiner with end cap directly outputting point ring light spots

Abstract

The utility model provides a fiber laser beam combiner with an end cap directly outputting point ring light spots, which comprises a central fiber, a plurality of peripheral fibers, a glass tube and an output end cap, the plurality of peripheral fibers are arranged on the periphery of the central fiber, the cladding of the central fiber and the cladding of the plurality of peripheral fibers are arranged in the glass tube, and the output end cap is arranged in the glass tube. The cladding of the glass tube, the cladding of the central optical fiber and the cladding of the plurality of peripheral optical fibers are fused and tapered to form a taper area; the input end of the output end cap is welded with the flatly-cut conical area, the output end of the output end cap is provided with a beam expanding end face, and the area of the beam expanding end face is larger than that of the input end of the output end cap. According to the scheme, the output end cap is directly adopted as output, point ring light spots are output, loss is reduced, and device integration is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of optical fiber lasers, in particular to an optical fiber laser beam combiner with an end cap directly outputting a point ring light spot. Background Art

[0002] Fiber lasers are widely used in industrial manufacturing, aerospace industry, and communication systems because of their advantages such as good beam quality and high electro-optical conversion efficiency. As an important component of fiber lasers, beam combiners are usually required to have lower signal insertion loss to obtain higher power output. In practical applications, the light beam is required to have a special shape or beam distribution. Among them, the spot ring spot output is a very important laser beam, for example, used in the field of laser welding.

[0003] Generally speaking, the intensity of the laser presents a Gaussian or nearly Gaussian distribution in space. However, in practical applications such as laser cutting and laser welding, the energy of the Gaussian beam is too concentrated in the center, which is not conducive to the use of laser energy. Utility Model Content

[0004] The utility model aims to provide a fiber laser beam combiner with an end cap directly outputting a point ring light spot.

[0005] In order to achieve the purpose of the utility model, the utility model provides an optical fiber laser combiner with an end cap directly outputting a point ring light spot, characterized in that it comprises a central optical fiber, N peripheral optical fibers, a glass tube and an output end cap, N≥2, a plurality of peripheral optical fibers are arranged on the periphery of the central optical fiber, a cladding of a central optical fiber and a plurality of peripheral optical fibers are both arranged in the glass tube, and the claddings of the plurality of peripheral optical fibers are respectively adjacent to the cladding of the central optical fiber and the inner wall of the glass tube; the claddings of the plurality of peripheral optical fibers are rotationally symmetrically distributed around the core of the central optical fiber, the cores of the plurality of peripheral optical fibers are rotationally symmetrically distributed around the core of the central optical fiber, a glass tube, a cladding of a central optical fiber and a plurality of peripheral optical fibers are melted and tapered to form a cone area; the input end of the output end cap is fused with the cut cone area, and the output end of the output end cap is provided with a beam expansion end face, and the area of ​​the beam expansion end face is larger than the area of ​​the input end of the output end cap.

[0006] A further solution is that the beam expansion end face is arranged in a plane perpendicular to the optical axis.

[0007] A further solution is that the beam expansion end surface is arranged in a spherical or aspherical surface.

[0008] A further solution is that N ≥ 6.

[0009] A further solution is to package the output terminal into a QBH style, a QD style or a Q+ style.

[0010] The beneficial effect of the utility model is that, after the cladding of the central optical fiber and the cladding of the peripheral optical fiber and the glass tube are melted and tapered, the flattened tapered area is directly welded to the output end cap, so that the output end cap is directly used as the output, and the output point ring light spot is output to reduce the loss, and it can be directly packaged into the form of QBH, Q+ or QD, which is convenient for the integration of the device and reduces the packaging of the combiner. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a light path diagram of an embodiment of the fiber laser beam combiner of the utility model.

[0012] Figure 2 It is a cross-sectional view of the glass tube in the embodiment of the fiber laser beam combiner of the utility model.

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0014] Reference Figure 1 to Figure 2 The fiber laser combiner includes a central optical fiber 20, N peripheral optical fibers 10, a glass tube 13 and an output end cap 15. In this embodiment, N is 6, i.e., 6 peripheral optical fibers 10. The plurality of peripheral optical fibers 10 are arranged on the periphery of the central optical fiber 20. The cladding 21 of the central optical fiber 20 and the cladding 12 of the plurality of peripheral optical fibers 10 are both arranged in the glass tube 13. The cladding 12 of the plurality of peripheral optical fibers 10 are respectively adjacent to the cladding 21 of the central optical fiber 20 and the inner wall of the glass tube 13. The cladding 12 of the plurality of peripheral optical fibers 10 is rotationally symmetrically distributed around the core 22 of the central optical fiber 20. The cores 14 are rotationally symmetrically distributed around the core 22 of the central optical fiber 20. A glass tube 13, a cladding of a central optical fiber 20 and claddings of multiple peripheral optical fibers 10 are melted and tapered to form a cone area. The melt taper method includes hydrogen-oxygen flame taper, graphite taper, laser taper and electrode taper. In order to obtain the point-ring light spot distribution, most of the laser energy after taper needs to propagate in the fiber core. Therefore, the taper ratio is calculated and evaluated according to the core mode cutoff. Subsequently, the cone area is cut flat to form the cone area 16. In addition, the cladding diameter of the optical fiber can be changed by chemical corrosion, laser etching and the like, so as to adjust the spacing between the point light spot and the ring light spot.

[0015] The input end 151 of the output end cap 15 is fused with the cut cone area 16, and the output end of the output end cap 15 is provided with a beam expanding end face 152, which is arranged in a plane perpendicular to the optical axis. The area of ​​the beam expanding end face 152 is larger than the area of ​​the input end of the output end cap 15. Finally, the output end cap 15 can be packaged into a QBH style, a QD style or a Q+ style, and then a point ring light spot can be output at the beam expanding end face 152.

[0016] Of course, the above embodiment is only a preferred embodiment of the present case. In specific applications, the value of N, that is, the data of the peripheral optical fiber, can be adjusted according to actual needs. As long as N≥2, and further, N≥6, it can also achieve the purpose of the utility model, and the beam expansion end face can also be arranged in a spherical or aspherical surface to adjust the output according to needs.

[0017] As can be seen from the above, in this case, the cladding of the central optical fiber and the cladding of the peripheral optical fiber and the glass tube are melted and tapered, and then the flattened tapered area is directly welded to the output end cap. Therefore, the output end cap is directly used as the output to output a point ring light spot to reduce the loss, and it can be directly packaged into the form of QBH, Q+ or QD, which is convenient for the integration of the device and reduces the packaging of the combiner.

Claims

1. A fiber laser beam combiner with an end cap directly outputting a spot ring spot, characterized in that: The invention comprises a central optical fiber, N peripheral optical fibers, a glass tube and an output end cap, wherein N is greater than or equal to 2, a plurality of the peripheral optical fibers are arranged at the periphery of the central optical fiber, a cladding of the central optical fiber and a plurality of the peripheral optical fibers are both arranged in the glass tube, and the claddings of the plurality of the peripheral optical fibers are respectively adjacent to the cladding of the central optical fiber and the inner wall of the glass tube; The claddings of the plurality of peripheral optical fibers are distributed rotationally symmetrically around the core of the central optical fiber, the cores of the plurality of peripheral optical fibers are distributed rotationally symmetrically around the core of the central optical fiber, and the claddings of one glass tube, one central optical fiber, and the plurality of peripheral optical fibers are melted and tapered to form a cone region; The input end of the output end cap is fused with the cut cone region, and the output end of the output end cap is provided with a beam expansion end face, the area of ​​which is larger than the area of ​​the input end of the output end cap.

2. The fiber laser beam combiner according to claim 1, characterized in that: The beam expansion end surface is arranged in a plane perpendicular to the optical axis.

3. The fiber laser beam combiner according to claim 1, characterized in that: The beam expansion end surface is arranged in a spherical or aspherical manner.

4. The fiber laser beam combiner according to claim 1, characterized in that: Said N≥6.

5. The fiber laser beam combiner according to any one of claims 1 to 4, characterized in that: The output terminal is packaged in a QBH style, a QD style or a Q+ style.

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