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Optical fiber device for point-ring-shaped laser output and preparation method thereof

A technology for outputting optical fibers and optical fiber devices, which is applied in the field of optical fiber devices output by point-ring laser and its preparation, can solve the problems of complex shaping structure, unfavorable high integration, poor overall reliability of spatial structure, etc., and achieves optical adaptation surface width and threshold value high power effect

Inactive Publication Date: 2021-01-05
SHANGHAI FEIBO LASER TECH CO LTD
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  • Application Information

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Problems solved by technology

Generally speaking, the space shaping structure is relatively complex, which is not conducive to the high integration of industrialization, and the overall reliability of the space structure is slightly poor
[0007] Mode scrambling method, cylindrical vector beam focusing and shaping method, vortex beam focusing and shaping method, etc., the above methods are several ways of laser beam shaping in the field of optical fiber waveguide, each has different advantages and disadvantages, and generally speaking, the operation and control are more difficult. high

Method used

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  • Optical fiber device for point-ring-shaped laser output and preparation method thereof
  • Optical fiber device for point-ring-shaped laser output and preparation method thereof
  • Optical fiber device for point-ring-shaped laser output and preparation method thereof

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preparation example Construction

[0067] The preparation method of the optical fiber device for the above-mentioned spot ring laser output comprises the following steps:

[0068] 1) Design the size of the input fiber bundle material according to the actual size of the output fiber, and determine the parameters of the inner input fiber bundle, the inner low refractive index sleeve, the outer input fiber bundle, and the outer low refractive index sleeve, including the quantity , inner diameter, outer diameter, and length; cut off several optical fibers of a certain length, strip off the coating layer of the tail fiber by 15cm, pre-process the input fiber bundle by laser etching, chemical corrosion or other physical methods, and adjust the input fiber bundle The diameter D2 of the cladding is within the design range, and the length of the fiber after pretreatment is greater than 10cm, or directly use the fiber that meets the parameters of the core and cladding diameters prepared by the drawing tower;

[0069] 2) ...

Embodiment 1

[0080] The inner layer input fiber bundle is selected as core / cladding: 20 / 400um, NA: 0.06 / 0.46 fiber double cladding; fiber pretreatment to cladding diameter D2: 70um;

[0081] The outer layer input fiber bundle uses core / cladding: 30 / 250um, NA: 0.06 / 0.46 fiber double cladding; the outer layer input fiber bundle does not do pretreatment;

[0082] The inner diameter D3 of the inner low refractive index sleeve is 160um, the outer diameter D4 is 250um; the inner diameter of the outer low refractive index sleeve is D7 = 760um, and the outer diameter is D8 = 900um;

[0083] The core diameter of the output fiber is D.A=70um, and the cladding thicknesses are: d.B=15um, d.C=100um, d.D=20um, d.E=10um.

[0084] According to the above materials and the above-mentioned production method, the bundle tapers are assembled. Considering the collapse of the middle of the optical fiber bundle assembly during the taper process, the diameter of the sleeve flat taper after the taper is actually co...

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Abstract

The invention relates to an optical fiber device for point-ring-shaped laser output and a preparation method thereof. The optical fiber device is composed of an input optical fiber, an input optical fiber tapering section and an output optical fiber in sequence, wherein the input optical fiber is divided into inner layer input optical fiber bundles, outer layer input optical fiber bundles, an inner low refractive index sleeve and an outer low refractive index sleeve, the number of the inner-layer input optical fiber bundles is one or three, the number of the outer-layer input optical fiber bundles is not less than six, the optical fibers in the inner low-refractive-index sleeve are inner-layer input optical fibers, the optical fibers located between the inner low-refractive-index sleeve and the outer low-refractive-index sleeve are outer-layer input optical fibers, and the output ends of the input optical fiber bundles are tapering ends; and the structure of the output optical fiber ismatched and connected with the structure of the tapering end of the input optical fiber bundle. According to the invention, point-ring-shaped distribution with adjustable output beam energy proportion can be realized through simple design and adjustment.

Description

technical field [0001] The invention relates to a laser device, in particular to an optical fiber device with point-ring laser output and a preparation method thereof. [0002] technical background [0003] Lasers are generally Gaussian beams, that is, the beam intensity presents a Gaussian distribution in space. Such a beam has a high energy intensity in the center and gradually decreases in intensity along the radial direction according to the Gaussian profile. In various fields such as laser cutting, laser welding, biomedicine, etc., practical applications not only require Gaussian beams, but also require laser beams to have specific requirements, such as energy distribution, with flat top spot, annular spot, lattice and other distributions. In terms of beam shape, it has square, circular and other shapes. [0004] In the process of high-power laser application, the Gaussian beam energy is concentrated in the central part, which is not conducive to the efficient use of la...

Claims

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Application Information

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IPC IPC(8): G02B6/26
CPCG02B6/262
Inventor 严超李文涛李骁军白云娜刘广柏
Owner SHANGHAI FEIBO LASER TECH CO LTD
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