高功率光纤激光器受激拉曼散射致模式不稳定研究
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国家自然科学基金项目(No.61875087)资助。


Mode instability induced by stimulated Raman scattering in high power fiber laser
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    摘要:

    通过稳态速率方程和热传导方程建立了高功率光纤放大器热光耦合的有限元模型,利用该模型对受激拉曼散射致模式不稳定效应进行了数值研究。对增益光纤为25/400μm的正向泵浦激光放大器,受激拉曼散射导致激光器信号光高阶模比例上升,当高阶模的比例达到5左右时,模场发生畸变,信号光出现了百毫秒量级的模式耦合,这与实验中观察到光强波动现象一致。本文仿真模型为研究高功率光纤放大器中受激拉曼散射和模式不稳定的关系提供了分析手段。

    Abstract:

    Based on the steady state rate equation and heat conduction equation,a finite element model of thermo optic coupling in high power fiber amplifier is established. This model is used to numerically study the mode instability induced by stimulated Raman scattering. For a forward pumped laser amplifier with a gain fiber of 25/400μm,the higher order modes of the laser signal light increases proportionally due to stimulated Raman scattering. When the proportion of higher order modes reaches about 5%,the mode field is distorted and the mode coupling of the signal light in the order of 100 ms appears which is consistent with the phenomenon of light intensity fluctuation that observed in the experiment. The simulation model provides an analytical method for studying the relationship between stimulated Raman scattering and mode instability in high power fiber amplifier.

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梁慧生,闫明鉴,郑云瀚,高俊峰,李永龙,李方欣,张晓宇,韩志刚.高功率光纤激光器受激拉曼散射致模式不稳定研究[J].激光与红外,2021,51(11):1440~1445
LIANG Hui-sheng, YAN Ming-jian, ZHENG Yun-han, GAO Jun-feng, LI Yong-long, LI Fang-xin, ZHANG Xiao-yu, HAN Zhi-gang. Mode instability induced by stimulated Raman scattering in high power fiber laser[J]. LASER & INFRARED,2021,51(11):1440~1445

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  • 最后修改日期:2021-01-24
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  • 在线发布日期: 2021-11-24
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