Method for inhibiting propagation of energy-transmitting optical fibers at cladding mode
A technology of energy transmission fiber and fiber cladding, applied in the laser field, can solve the problems of high cost, difficult processing of coupling optical system, and reduced efficiency of energy transmission fiber, so as to improve beam quality, reduce cladding mode laser output, and avoid damage Effect
Inactive Publication Date: 2010-12-29
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology
The propagation of the cladding mode in the energy transmission fiber can be avoided to a large extent by adopting an aspheric lens without spherical aberration and a large numerical aperture tolerance design of the incident beam, but there are disadvantages such as difficult processing and high cost of the coupling optical system, which is relatively large. The numerical aperture tolerance design of the incident beam will significantly reduce the efficiency of coupling the laser light source into the energy transmission fiber
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[0005] Such as figure 1 As shown, the energy transmission fiber includes an input end 1 , an intermediate transmission section 2 and an output end 3 . The input end 1 and the output end 3 are equipped with fiber optic connector interfaces, which facilitate the connection of optical fibers, laser light sources, and applied optical systems. The typical cross-sectional structure of energy-transmitting optical fiber is as follows: figure 2 As shown, the fiber core layer 4 is the medium for energy transmission fiber laser transmission, the fiber cladding layer 5 guides the laser light transmitted in the fiber core layer 4, and the fiber coating layer 6 protects the energy transmission fiber. A section of energy-transmitting optical fiber in the input end 1 is removed from the fiber coating 6 and roughened on the outer surface 7 of the fiber cladding 5 to effectively increase the loss of the cladding mode laser, such as image 3 Shown is the cross-sectional structure of the optic...
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The invention relates to a method for inhibiting propagation of energy-transmitting optical fibers at cladding mode, belonging to the technical field of laser. The prior art in the field is difficult to effectively inhibit the laser propagation of the energy-transmitting optical fibers at the cladding mode and can damage the energy-transmitting optical fibers caused by absorption of a coating layer of the laser at the cladding mode. Simultaneously, the laser propagation at the cladding mode also reduces the quality of light beam which is output by the optical fiber coupled laser. The method removes the coating layer at one section of length of an optical fiber input end and then roughens the outer surface of the cladding layer, thereby increasing the propagation loss of the laser at the cladding mode, leading the laser at the cladding mode not to propagate effectively and effectively improving the performance of the energy-transmitting optical fibers. The method can be applied in the manufacture of a variety of energy-transmitting optical fiber connectors.
Description
technical field [0001] The invention relates to a method for suppressing propagation of cladding mode of an energy-transmitting optical fiber, which belongs to the technical field of lasers. Background technique [0002] Energy-transmitting optical fibers are mainly used to transmit laser beams with a power of more than tens of watts. They have the advantages of easy use, long transmission distance, and small transmission loss. Generally, the method of compressing the beam size with a lens is used to couple the output beam of the laser into the energy-transmitting optical fiber. In order to allow the input end of the energy-transmitting optical fiber to withstand greater power density and meet the requirements for precise positioning of the optical fiber connector, a length of coating layer at the input end of the energy-transmitting optical fiber is usually removed. Due to factors such as poor quality of the light source and spherical aberration of the lens, a part of the l...
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IPC IPC(8): G02B6/02G02B6/42
Inventor 薄报学高欣乔忠良芦鹏王玉霞
Owner CHANGCHUN UNIV OF SCI & TECH