Six kilowatt record all-fiberized and narrow-linewidth fiber amplifier with near-diffraction-limited beam quality  

作　　者：Guangjian Wang Jiaxin Song Yisha Chen Shuai Ren Pengfei Ma Wei Liu Tianfu Yao Pu Zhou 

机构地区：[1]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China

出　　处：《High Power Laser Science and Engineering》2022年第4期1-6,共6页高功率激光科学与工程（英文版）

基　　金：National Natural Science Foundation of China(NSFC)(62005313,62035015);Innovative Research Team in Natural Science Foundation of Hunan Province(2019JJ10005).

摘　　要：In this work,an all-fiberized and narrow-linewidth fiber amplifier with record output power and near-diffraction-limited beam quality is presented.Up to 6.12 kW fiber laser with the conversion efficiency of approximately 78.8%is achieved through the fiber amplifier based on a conventional step-index active fiber.At the maximum output power,the 3 dB spectral linewidth is approximately 0.86 nm and the beam quality factor is M_(x)^(2)=1.43,M_(y)^(2)=1.36.We have also measured and compared the output properties of the fiber amplifier employing different pumping schemes.Notably,the practical power limit of the fiber amplifier could be estimated through the maximum output powers of the fiber amplifier employing unidirectional pumping schemes.Overall,this work could provide a good reference for the optimal design and potential exploration of high-power narrow-linewidth fiber laser systems.

关 键 词：fiber laser high power narrow linewidth 

分 类 号：TN248[电子电信—物理电子学] TN722