All-fiberized very-large-mode-area Yb-doped fiber based high-peak-power narrow-linewidth nanosecond amplifier with tunable pulse width and repetition rate  

作　　者：Min Yang Ping-Xue Li Dong-Sheng Wang Ke-Xin Yu Xue-Yan Dong Ting-Ting Wang Chuan-Fei Yao Wei-Xin Yang 杨敏;李平雪;王东生;于可新;董雪岩;王婷婷;姚传飞;杨卫鑫(Institute of Laser Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]Institute of Laser Engineering,Beijing University of Technology,Beijing 100124,China

出　　处：《Chinese Physics B》2020年第11期343-349,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No. 61675009);the Beijing Natural Science Foundation Program, China,Scientific Research Key Program of Beijing Municipal Education Commission, China (Grant No. KZ201910005006)

摘　　要：We demonstrate an all-fiberized narrow-linewidth nanosecond amplifier with high peak power,tunable pulse width,and repetition rate.A fiber-coupled narrow-linewidth laser diode operating at 1064.1 nm is employed as the seed source,which is gain-switched to generate nanosecond pulses with tunable pulse widths of 1-200 ns and tunable repetition rates of10 Hz-100 kHz.By utilizing a very-large-mode-area Yb-doped fiber with a core diameter of 50 μm in the power amplifier,thresholds of the stimulated Brillouin scattering at different pulse widths and repetition rates are increased.The maximum average power reaches 30.8 W at the pulse width of 4 ns and a repetition rate of 100 kHz,corresponding to an optical-tooptical conversion efficiency of ~55.2%.Pulse energy and peak power are calculated to be 0.2 mJ and 50 kW,respectively,which are limited by stimulated Brillouin scattering.The 3-dB spectral linewidth remains around 0.05 nm during the power scaling process.The stimulated Brillouin scattering limited output powers at different pulse widths and repetition rates are investigated.Peak power of 47.5 kW(0.19 mJ) is obtained for the 4 ns pulses at a repetition rate of 50 kHz,which is nearly the same as that of 4 ns pulses at 100 kHz.When the pulse width of the seed source is increased to 8 ns,peak powers/pulse energies are decreased to 19.6 kW/0.11 mJ and 13.3 kW/0.08 mJ at repetition rates of 50 kHz and 100 kHz,respectively.

关 键 词：nanosecond all-fiber amplifier very-large mode area tunable pulse width and repetition rate 

分 类 号：TN722[电子电信—电路与系统]