强激光与粒子束2024，Vol.36Issue(7)：1-3,3.DOI:10.11884/HPLPB202436.240171
2μm超窄线宽光纤激光实现1kW近衍射极限输出
2 μm ultra-narrow linewidth fiber laser achieves 1 kW near-diffraction-limited output
摘要
Abstract
Fiber lasers in the 2 μm 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 1 950 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Key words
fiber laser/MOPA amplification/thulium-doped fiber laser/mode instability/quantum loss分类
信息技术与安全科学引用本文复制引用
刘航,唐淳,王宏宇,王佳伟,于洋,张骞文,冯昱骏,孙殷宏,徐善辉,鲁燕华..2μm超窄线宽光纤激光实现1kW近衍射极限输出[J].强激光与粒子束,2024,36(7):1-3,3.基金项目
国家重点研发计划项目(2022YFB3606403) （2022YFB3606403）
