Double covered optical fiber side-pumping coupler grating and realization method thereof

Abstract

This invention relates to one double coverage layer fiber side pump coupler grating, which comprises the following parts: inner package layer with one set of isosceles triangle level tanks with same structure parallel and tightly distributed with same length with LD array slow axis; the tank slope angle is more than sin-1n0/n2 with width H equal to lambada /n2sin2alpha. The method comprises the following steps: removing outer package layer; etching the inner package layer as process type; polishing the tank and coating the medium film to form inner coverage coupler grating.

Description

technical field The invention relates to a side-pumped coupling structure of a high-power double-clad fiber laser and its realization method, in particular to a double-clad fiber side-pumped coupling volume grating and its realization method, belonging to the technical field of special optical fibers. Background technique High-power double-clad lasers and amplifiers have crucial applications in national defense, industrial advanced laser manufacturing, precision welding, and laser radar. The pump source for such high-power double-clad lasers and amplifiers is generally a laser diode array. Therefore, how to efficiently couple the pump light of the laser diode array into the double-clad fiber has become the technical key to making high-power lasers and amplifiers. As the core technology of high-power lasers and fiber amplifiers, pump coupling technology aims to couple hundreds of watts or even kilowatts of laser diode LD pump light power into the inner cladding of double-c...

AI Technical Summary

Problems solved by technology

The present invention solves the problems of low coupling efficiency, high implementation cost, and relatively complicated process when pumping double-clad doped optical fibers by the side of an LD array, so as to realize high-power doped fiber lasers and optical fibers with simple process, high efficiency and low cost. The optical fiber side coupling structure and coupling method of the amplifier provide the possibility of making high-power laser weapons

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