2 μm超窄线宽光纤激光实现1 kW近衍射极限输出  

2μm ultra-narrow linewidth fiber laser achieves 1 kW near-diffraction-limited output

作　　者：刘航 王宏宇[3] 王佳伟 于洋 张骞文 冯昱骏 孙殷宏[1,2] 徐善辉 鲁燕华[1,2] 唐淳[1,2] Liu Hang;Wang Hongyu;Wang Jiawei;Yu Yang;Zhang Qianwen;Feng Yujun;Sun Yinhong;Xu Shanhui;Lu Yanhua;Tang Chun(Institute of Applied Electronics,China Academy of Engineering Physics,Mianyang 621900,China;National Key Laboratory of Advanced Lasers and High Power Microwaves,Mianyang 621900,China;Institute of Optical Communication Materials,South China University of Technology,Guangzhou 510600,China;Mianyang Office of the Military Representative Bureau,Equipment Department of Military Aerospace Forces,Mianyang 621000,China;Graduate School of China Academy of Engineering Physics,Beijing 100088,China)

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900 [2]先进激光与高功率微波全国重点实验室,四川绵阳621900 [3]华南理工大学光通信材料研究所,广州510600 [4]军事航天部队装备部军事代表局驻绵阳地区军事代表室,四川绵阳621000 [5]中国工程物理研究院研究生部,北京100088

出　　处：《强激光与粒子束》2024年第7期1-3,共3页High Power Laser and Particle Beams

基　　金：国家重点研发计划项目(2022YFB3606403)。

摘　　要：2 μm波段光纤激光广泛应用于生物医学、环境监测、非线性频率转换,以及激光雷达和激光通信领域,备受研究人员关注。然而,该波段的激光器功率提升面临着低量子效率、高热负载和部分非线性效应的限制。基于反转概率调谐序列的高阶相位调制技术以抑制SBS效应、多级链路自动反馈的信号激光时域稳定控制技术以提升SRS阈值,以及光纤基横模纯化技术以控制光束质量,采用两级主放大结构,在1 950 nm波长实现了1 kW窄线宽近衍射极限输出,光光转换效率达55.6%,线宽3.8 GHz,光束质量M~2约1.2,在最高功率时无横向模式不稳定效应。Fiber lasers in the 2μm band are widely applicated in biomedicine,environmental monitoring,nonlinear frequency conversion,as well as in laser radar and laser communications.However,the power scaling of lasers in this band are limited by low quantum efficiency,high thermal loading,and several nonlinear effect.In this study,we propose a higher-order phase modulation technique based on inverted probability tuning sequences to suppress the SBS effect,a signal laser time-domain stabilization control technique with multi-stage link auto-feedback to enhance the SRS threshold,and a fiber-based transverse-mode purification technique to control the beam quality.Finally,a two-stage main amplification structure is used to achieve an ultra-narrow linewidth near-diffraction-limited output of 1 kW at 1950 nm,with an optical-to-optical conversion efficiency of 55.6%,linewidth of 3.8 GHz,beam quality M2 factor of about 1.2,and no transversemode instability effect.

关 键 词：光纤激光 MOPA放大 掺铥光纤激光器 模式不稳定 量子亏损 

分 类 号：TN242[电子电信—物理电子学]