介绍了基于主振荡功率放大结构的人眼安全全光纤激光器。首先对比了电光调制及直接调制产生的种子激光在百kHz重复频率、纳秒级脉冲宽度的激光放大器中优缺点，综合系统需求选择直接调制方式；之后对窄脉冲单模放大中出现的脉冲分裂现象进行了研究，选用10 μm纤芯的双包层铒镱共掺光纤，仅通过两级放大即获得了1 550 nm，重复频率为200 kHz，脉冲宽度为4.07 ns，峰值功率为1.02 kW的单模激光输出。具有结构紧凑、稳定可靠的特点，可用于三维视频激光雷达。

An eye-safe, all fiber, single mode, fiber laser based on master oscillator power amplifier configuration was presented. The advantages and disadvantages were compared between using a directly modulated diode laser and an electro-optical modulated continuous-wave diode as seed laser in sub-Mega Hertz, nanosecond fiber amplifier. The main restriction of power scaling in nanosecond fiber laser was pulse split. 10 μm core double cladding erbium ytterbium co-doped fiber was employed as gain fiber of power amplifier. The directly modulated seed laser was then amplified by only two stage amplifiers. Finally, a peak power of 1.02 kW with 4.07 ns pulse duration at 200 kHz pulse repetition frequency with single-mode output was obtained and it is applicable in three dimensional video imaging lidar system.