Greater than 2 kW all-passive fiber Raman amplifier with good beam quality

作     者：Yizhu Chen Tianfu Yao Hu Xiao Jinyong Leng Pu Zhou 

作者机构：College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha 410073China 

出 版 物：《High Power Laser Science and Engineering》 (高功率激光科学与工程（英文版）)

年 卷 期：2020年第8卷第4期

页      面：23-28页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 080902[工学-电路与系统] 08[工学] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by Huo Yingdong Education Foundation(No.151062) Hunan Provincial Innovation Construct Project(No.2019RS3017) National Natural Science Foundation of China(Nos.11704409 and 61605246) 

主　　题：nonlinear optics optical fiber lasers power amplifiers Raman scattering 

摘      要：We report a 2 kW all-fiberized Raman fiber amplifier with efficient brightness enhancement based on the graded-index *** maximum power output reaches up to 2.034 kW centered at 1130 nm,with a conversion efficiency of 79.35%with respect to the injected pump *** the best of our knowledge,this is the highest conversion efficiency obtained for any Raman laser system using graded-index *** optimized fiber combiner adopting graded-index fiber as the pigtail fiber was fabricated,enabling the preservation of the seeding brightness in the core-pumped Raman fiber amplifier,and further enhancing the ultimate brightness of the output laser after *** the maximum power output,the beam quality parameter M2 is 2.8,corresponding to a signal-to-pump brightness enhancement factor of *** far as we know,we obtain the highest brightness enhancement among Raman fiber lasers of over 100 W,and the best beam quality for graded-index Raman fiber lasers of over 150 W.