Coating film rotating device and method for side cylindrical surface of optical fiber

Abstract

The invention relates to a coating film rotating device for a side cylindrical surface of an optical fiber, comprising a flat disk and a revolution piece, wherein the center of the flat disk is fixed with a center shaft, the revolution piece is shaped as a barrel and sleeved on the center shaft of the flat disk, a plurality of horizontal struts are transversally arranged at one end of the revolution piece which is close to the flat disk, the end part of each horizontal strut is pivoted with an autorotation piece, the autorotation piece is in frictional contact with the surface of the flat disk, the parts are placed in a film coating chamber, a crucible is also placed in the film coating chamber, each autorotation piece is connected with the optical fiber to be plated, and the revolution piece drives the autorotation pieces which are in frictional contact with the surface of the flat disk to rotate when the revolution piece rotates.

Description

technical field [0001] The invention belongs to the field of optical fiber coupling, in particular, the invention relates to a rotating device and method for coating a cylindrical surface on the optical fiber side. Background technique [0002] Semiconductor lasers (LDs) are widely used in optical fiber communications, solid-state lasers, and other fields due to their high electro-optic conversion efficiency, small size, narrow bandwidth, and high reliability. However, the beam quality of semiconductor lasers cannot be compared with that of solid-state lasers with doped yttrium aluminum garnet (YAG) as the working medium. The divergence angle of semiconductor lasers is generally characterized from two directions: the direction perpendicular to the fast axis of the pn junction and the direction parallel to in the direction of the slow axis of the pn junction. The divergence angle in the direction of the fast axis is relatively large, generally around 40°. In the beam shaping...

AI Technical Summary

Problems solved by technology

However, the beam quality of semiconductor lasers cannot be compared with that of solid-state lasers with doped yttrium aluminum garnet (YAG) as the working medium. The divergence angle of semiconductor lasers is generally characterized from two directions: the direction perpendicular to the fast axis of the pn junction and the direction parallel to in the direction of the slow axis of the pn junction

The divergence angle in the direction of the fast axis is relatively large, generally around 40°. In the beam shaping technology of semiconductor lasers, the first step is to collimate and compress the fast axis. The most traditional and simple compression method is to use a bare The optical fiber is used as a cylindrical lens to converge the laser light emitted by the LD. Although this method is simple and convenient, because there is Fresnel reflection on the cylindrical surface of the optical fiber (the reflectivity is about 4%), if the bare optical fiber is directly used for compression, the inherent laser The collimation loss is as high as 7.8%, which seriously affects the coupling efficiency of the entire beam shaping, causing unnecessary loss of light energy, and also increases the heat dissipation load of the system

In order to solve this problem, the direct method is to coat a layer of high-transparency film on the side cylindrical surface of the bare fiber to reduce the reflectivity to less than 0.5%, so that the light energy loss caused by the inherent Fresnel reflection It is reduced to a very weak level, almost negligible, but it is undoubtedly very difficult to coat a layer of uniform and dense high-transmittance film on the arc surface of the bare fiber. This invention provides a cylindrical surface on the side of the fiber to solve this problem. Coating Fixtures to Enable Coating of Fiber Side Cylindrical Surfaces

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