1.2 kW all-fiber narrow-linewidth picosecond MOPA system  

作　　者：Jiexi Zuo Haijuan Yu Shuzhen Zou Zhiyong Dong Chaojian He Shuang Xu Chaoyu Ning Xuechun Chen Xinyao Li Xuechun Lin 

机构地区：[1]Laboratory of All-Solid-State Light Sources,Institute of Semiconductors,Chinese Academy of Sciences,Beijing,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,China [3]College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing,China [4]Beijing Engineering Technology Research Center of All-Solid-State Lasers Advanced Manufacturing,Beijing,China

出　　处：《High Power Laser Science and Engineering》2023年第2期52-58,共7页高功率激光科学与工程（英文版）

基　　金：This work was financially supported by the CAS Project for Young Scientists in Basic Research(No.YSBR-065);the National Natural Science Foundation of China(Nos.62225507,62175230,and U2033211);the Scientific Instrument Developing Project of the Chinese Academy of Sciences(No.YJKYYQ20200001)。

摘　　要：Achieving an all-fiber ultra-fast system with above kW average power and mJ pulse energy is extremely challenging.This paper demonstrated a picosecond monolithic master oscillator power amplifier system at a 25 MHz repetition frequency with an average power of approximately 1.2 kW,a pulse energy of approximately 48μJ and a peak power of approximately 0.45 MW.The nonlinear effects were suppressed by adopting a dispersion stretched seed pulse(with a narrow linewidth of 0.052 nm)and a multi-mode master amplifier with an extra-large mode area;then an ultimate narrow bandwidth of 1.32 nm and a moderately broadened pulse of approximately 107 ps were achieved.Meanwhile,the great spatio-temporal stability was verified experimentally,and no sign of transverse mode instability appeared even at the maximum output power.The system has shown great power and energy capability with a sacrificed beam propagation product of 5.28 mm·mrad.In addition,further scaling of the peak power and pulse energy can be achieved by employing a lower repetition and a conventional compressor.

关 键 词：fiber laser nonlinear optics picosecond pulse transverse mode instability 

分 类 号：TN248[电子电信—物理电子学]