An optical fiber for shaping Gaussian beams into one-dimensional flat-hat beams
A Gaussian beam, flat-top beam technology, applied in cladding fiber, optical waveguide light guide, optics, etc., can solve the problems of unfavorable industrial application, complicated manufacturing process, poor stability, etc., and achieve good beam homogenization effect and flexible use. , the effect of short manufacturing cycle
Active Publication Date: 2020-02-11
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology
There are many ways to obtain a flat-hat beam. The diffractive beam shaping device designed with the principle of diffractive optics can achieve better results, but its manufacturing process is complicated and the cost is high, which is not conducive to industrial application; the beam shaping optics designed using the principle of geometric optics system, there are problems such as large size, difficult installation, high price and poor stability
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[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0022] An optical fiber for realizing Gaussian beam shaping into a one-dimensional flat-hat beam, that is, a method for realizing Gaussian beam shaping into a one-dimensional flat-hat beam based on a special optical fiber, and belongs to the technical field of laser beam shaping. The special fiber core material is high refractive index SiO 2 , the shape of the core can be rectangular, square, hexagonal or octagonal, and the diagonal distance of the core is 20um to 800um; the core is located in the cladding, and the cladding material is fused silicon with low refractive index The diameter of the layer is 100um-1600um; outside the cladding is a coating layer, the material of the coating layer is nylon or acrylic resin, and the diameter of the coating layer is 200um-2000um. The numerical aperture of the special optical fiber is 0.12 or ...
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Abstract
The invention provides an optical fiber for shaping Gaussian beams into one-dimensional flat-topped beams, provides a method for shaping the Gaussian beams into the one-dimensional flat-topped beams based on the special optical fiber, and belongs to the technical field of laser beam shaping. The fiber core material of the special optical fiber is high-refractive-index SiO2, the fiber core shape can be rectangular, square, hexagonal or octagonal, and the fiber core diagonal distance is 20-800 microns; the fiber core is arranged in a wrapping layer, the material of the wrapping layer is a low-refractive-index molten silicon and the diameter of the wrapping layer is 100-1600 microns; and the wrapping layer is externally provided with a coating layer, the material of the coating layer is nylonor acrylic resin and the diameter of the coating layer is 200-2000 microns. The numerical aperture of the special optical fiber is 0.12 or 0.22 or 0.28. The optical fiber can be spliced with an optical fiber laser output optical fiber so that the Gaussian beams can be homogeneously shaped into the one-dimensional flat-topped beams. The special optical fiber homogeneous shaping method has the advantages of being convenient to use, low in cost, great in shaping effect and convenient to be spliced with the laser output optical fiber without additional mechanism.
Description
technical field [0001] The invention relates to an optical fiber capable of shaping a Gaussian beam into a one-dimensional flat-hat beam, and belongs to the technical field of laser beam shaping. Background technique [0002] Flat-hat beam refers to the beam whose light intensity is uniformly distributed in the cross-section of the beam transmission direction. Due to the uniform energy distribution, it has important applications in the fields of display, holography, laser processing, and laser medical treatment. For example, in laser cleaning, in order to obtain high cleaning efficiency and reduce substrate damage, this requires the optical field distribution of the laser beam to be flat-topped, and the flat-topped beam can obtain better strengthening effects in laser strengthening applications. Since the light intensity of the laser beam generally obeys the Gaussian distribution, it is necessary to shape the Gaussian beam in order to obtain a flat-hat beam with good uniform...
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IPC IPC(8): G02B6/02G02B27/09
CPCG02B6/02G02B27/0911G02B27/0994
Inventor 薛亚飞李广王巍高文焱王学锋王军龙李凯李本海
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES