Elliptical cladding polarization-maintaining large-mode-area gain fiber

Abstract

The invention discloses an elliptical cladding polarization-maintaining large-mode-area gain fiber, which, in the structure, comprises a fiber core of the elliptical cladding polarization-maintaining large-mode-area gain fiber, an inner cladding layer, an elliptical stress layer, a first outer cladding layer, a second cladding layer and a third cladding layer, wherein the inner cladding layer coats the fiber core; the elliptical stress layer coats the inner cladding layer, and the elliptical stress layer is elliptical on the cross section of the elliptical cladding polarization-maintaining large-mode-area gain fiber; the first cladding layer coats the elliptical stress layer; the second cladding layer coats the first cladding layer; and the third cladding layer coats the second cladding layer. As birefringence of the elliptical cladding polarization-maintaining fiber is directly proportional to ellipticity, deposition of a polarization-maintaining stress region only needs to be additionally added during a rod forming process, steps such as drilling are not needed, unavoidable impurities can be prevented from being introduced in a fiber pre-form rod, loss of the fiber after wire drawing can be reduced, strength of the fiber is improved, the entire forming process has simple steps, and the birefringence and pump absorption of the fiber can be improved.

Description

technical field [0001] The invention relates to the field of fiber lasers and amplifiers, in particular to an elliptical-clad polarization-maintaining large-mode-field gain fiber. Background technique [0002] Fiber lasers and amplifiers using double-clad ytterbium-doped fibers as gain media have the characteristics of high output power, high electro-optic conversion efficiency, and high beam quality. However, as the requirements for laser output power continue to increase, it is difficult for a single fiber laser to meet the application requirements from thousands of watts to hundreds of thousands of watts. It is necessary to combine the outputs of several fiber lasers into a single laser output by combining beams. By using a large-mode-field fiber with polarization-maintaining characteristics to make a laser, the output of multiple fiber lasers can be combined coherently, thereby greatly increasing the laser power. [0003] At present, the polarization-maintaining large-m...

AI Technical Summary

Problems solved by technology

[0005] The embodiments of the present invention provide an elliptical-clad polarization-maintaining large-mode-field-gain fiber to solve the complex preparation process, low birefringence and pump absorption of the panda-shaped large-mode-field-gain polarization-maintaining fiber in the prior art. lower technical issues

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