Cladding light stripper for optical fiber lasers and making method thereof

Abstract

The invention discloses a cladding light stripper for optical fiber lasers and a making method thereof. The stripper comprises a cladding optical fiber, multiple optical gratings, and a cooling tube sleeve. The making method comprises the following steps: coating the outer surface of a bare optical fiber inner cladding with ultraviolet photoresist of which the refractive index is greater than or equal to that of the inner cladding; etching multiple gratings on the ultraviolet photoresist, and stripping out the residual light in the inner cladding through diffraction of the multiple gratings; and sleeving the finished multiple gratings in a metal tube, and sealing the metal tube with a sealing sleeve, wherein the wall of the metal tube is fully covered with a heat absorption material which absorbs the light stripped from the inner cladding, and circulating cooling water is fed to take away the generated heat. The light transmittance of the cladding light is adjusted by gratings of different structures so as to achieve the purpose of efficient and uniform light stripping, avoid overheated spots of the stripper and ensure high stability of optical fibers. The stripper has the characteristics of simple structure, wide applicability, high reliability, and the like.

Description

technical field [0001] The patent of the present invention belongs to the field of fiber lasers, and relates to a device for stripping residual light of cladding of high-power fiber lasers and a manufacturing method thereof. Background technique [0002] In recent years, with the continuous development of high-power fiber lasers, the power of fiber lasers has continued to rise. High-power fiber lasers have become a widely used industrial processing laser, and the requirements for beam quality and system stability are also stricter. [0003] In the fiber laser system, due to the influence of nonlinear effects, the gain fiber cannot be made long enough, which directly leads to a certain amount of pump light remaining in the inner cladding of the double-clad fiber. In high-power fiber lasers, this power It can reach hundreds of watts, in addition to the spontaneous emission (ASE) generated by the gain fiber when it is working, and the signal light leaked into the inner cladding...

AI Technical Summary

Problems solved by technology

However, due to the sudden change of the cladding structure in this method, a large amount of light will leak out at the front end of the stripper, generating a large amount of heat, which often makes the temperature of the front end too high, thereby greatly limiting the performance of the cladding optical stripper. step up

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