Gain fiber refractive index distribution optimization design method, gain fiber and its application

By optimizing the core refractive index distribution of the gain fiber and making it present a centrally symmetrical triangular or parabolic distribution, the shortcomings of gain fiber in the prior art in suppressing nonlinear effects and mode instability effects are solved, and a significant increase in the field area of ​​the fundamental mode mode and the improvement of the laser output power are achieved.

CN119556465BActive Publication Date: 2025-03-28NAT UNIV OF DEFENSE TECH
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Patent Information

Application Number
CN202510103038.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-01-22
Publication Date
2025-03-28
Estimated Expiration
2045-01-22

AI Technical Summary

Technical Problem

The existing gain fiber designs have shortcomings in suppressing nonlinear effects and mode instability effects, resulting in limited output power improvement of fiber laser systems.

Method used

By optimizing the core refractive index distribution of the gain fiber, it presents a triangular or parabolic distribution with a center symmetrical center, so as to increase the basic mode mode field area and suppress the change in the mode field area of ​​the higher-order mode while keeping the core size and average NA value unchanged.

Benefits of technology

It is achieved that without changing the core size and average NA value, the field area of ​​the fundamental mode mode is significantly improved, the nonlinear effect suppression ability is enhanced, and the mode instability effect is effectively suppressed, and the output power of the laser is increased.

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Abstract

The present invention proposes a gain fiber refractive index distribution optimization design method, gain fiber and application. By using a parabola-concave core refractive index distribution to adjust the mode distribution in the core, the mode field area of ​​the fundamental mode can be significantly increased while the number of high-order modes and the mode field area of ​​the high-order modes remain almost unchanged. On the one hand, the increase in the fundamental mode area can effectively alleviate the nonlinear effect in the optical fiber. On the other hand, when the fundamental mode area increases while the mode field area and the number of modes of the high-order modes remain unchanged, the fundamental mode can obtain more gain, while the high-order modes can only obtain less gain, thereby achieving the purpose of suppressing the mode instability effect and ultimately achieving an increase in output power.
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