All-fiberized and narrow-linewidth 5 kW power-level fiber amplifier based on a bidirectional pumping configuration  

作　　者：Pengfei Ma Hu Xiao Wei Liu Hanwei Zhang Xiaolin Wang Jinyong Leng 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》2021年第3期87-93,共7页高功率激光科学与工程（英文版）

基　　金：supported by the Guangdong Key Research and Development Program(No.2018B090904001);the National Natural Science Foundations of China(Nos.62005313 and 61705264);the Innovative Research Team in Natural Science Foundation of Hunan Province(No.2019JJ10005);the Hunan Provincial Innovation Construct Project(No.2019RS3017)。

摘　　要：In this paper,an all-fiberized and narrow-linewidth 5 kW power-level fiber amplifier is presented.The laser is achieved based on the master oscillator power amplification configuration,in which the phase-modulated single-frequency laser is applied as the seed laser and a bidirectional pumping configuration is applied in the power amplifier.The stimulated Brillouin scattering,stimulated Raman scattering,and transverse mode instability effects are all effectively suppressed in the experiment.Consequently,the output power is scaled up to 4.92 kW with a slope efficiency of as high as approximately 80%.The 3-dB spectral width is about 0.59 nm,and the beam quality is measured to be M^(2)~1.22 at maximum output power.Furthermore,we have also conducted a detailed spectral analysis on the spectral width of the signal laser,which reveals that the spectral wing broadening phenomenon could lead to the obvious decrease of the spectral purity at certain output power.Overall,this work could provide a reference for obtaining and optimizing high-power narrow-linewidth fiber lasers.

关 键 词：advanced laser technology and applications fiber laser and applications high-power laser laser amplifiers 

分 类 号：TN253[电子电信—物理电子学] TN722