报道了高功率全光纤MOPA结构的纳秒脉冲掺铥光纤激光器，其包括低功率被动调Q掺铥光纤激光器种子源，以及两级全光纤结构790 nm半导体抽运的高功率掺铥光纤放大器。随抽运功率的改变，激光种子源产生的脉冲重复频率在77～240 kHz可调，最窄激光脉冲宽度为250 ns，最大平均输出功率为73 mW。经过两级全光纤掺铥光纤放大器放大之后，最高平均输出功率达到了20 W，相应的单脉冲能量为100 μJ，激光脉冲宽度为270 ns，中心波长为1966 nm。

A high power all-fiber nanosecond-pulsed thulium-doped fiber master oscillator power amplifier (MOPA) system that consists of low power passively Q-switched thulium-doped fiber laser seed and two-stage thulium-doped double-clad all-fiber amplifiers pumped by high power multimode diodes at 790 nm is studied. The repetition rate of the thulium-doped fiber laser seeder is tunable from 77 kHz to 240 kHz with the increase of pump power, the minimum pulse width is measured to be 250 ns and the maximum average output power is 73 mW. Two-stage double-clad thulium-doped all-fiber amplifiers are used to boost average power to 20 W, corresponding to single pulse energy of 100 μJ. The pulse width is 270 ns, and laser center wavelength is 1966 nm.