全光纤单频光纤放大器实现550W近衍射极限输出  

550-W Single-Frequency All-Fiber Amplifier with Near-Diffraction-Limited Beam Quality

作　　者：来文昌 马鹏飞 刘伟[1] 黄龙[1] 李灿 周朴[1] Lai Wenchang;Ma Pengfei;Liu Wei;Huang Long;Li Can;Zhou Pu(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha,Hunan 410073,China)

机构地区：[1]国防科技大学前沿交叉学科学院,湖南长沙410073

出　　处：《中国激光》2020年第4期318-320,共3页Chinese Journal of Lasers

基　　金：国家自然科学基金(61705264);湖南省创新研究群体基金(2019JJ10005);湖南创新型省份建设专项(2019RS3017);广东省重点领域研发计划(2018B090904001)。

摘　　要：通过引入长锥形增益光纤综合抑制受激布里渊散射和模式不稳定效应,兼顾1030nm波段信号光放大的高模式不稳定阈值特性,基于全光纤放大器实现了550W的近衍射极限单频光纤激光输出,整个放大器的斜率效率达80%,最高功率时的光束质量测量值M^2约为1.47;系统亮度的进一步提升受限于热致模式不稳定效应。In this study,a 550-W single-frequency all-fiber laser with near diffraction-limited beam quality is achieved by simultaneously suppressing the stimulated Brillouin scattering and mode instability effects with a long-tapered gain fiber and employing the ability of high mode instability threshold of 1030-nm signal laser.The slope efficiency of the whole amplifier is observed to be as high as 80%and the measured beam quality M^2 is approximately 1.47 at the maximum output power.Further brightness scaling is limited owing to the mode instability effect.

关 键 词：激光器 高功率光纤激光 单频 受激布里渊散射 模式不稳定 

分 类 号：TN248[电子电信—物理电子学]