以一个增益调制的分布式布喇格反射结构的半导体激光器为种子源，设计了一个高功率皮秒脉冲簇输出的线偏振掺镱光纤激光器. 种子源输出脉冲宽度200 ps，重复频率350 MHz. 在预放大中插入一个基于一级衍射透过的声光调制器实现了皮秒脉冲簇形式的激光输出，脉冲簇的重复频率在10～500 kHz范围可调. 皮秒脉冲簇激光通过一个基于大模场面积保偏Yb光纤的功率放大级，获得了高功率线偏振激光输出，平均功率83 W，偏振消光比优于15 dB.当脉冲簇重复频率固定在100 kHz，脉冲簇中同时存在350个子脉冲时，获得峰值功率12 kW的皮秒激光输出. 与传统连续脉冲输出的激光器相比，该系统能够实现脉冲簇的输出，有利于峰值功率的进一步提高，可应用于激光微加工领域.

A high power linearly polarized Yb fiber laser with picosecond pulse bunch output was designed based on the seed consisting of a gain-switched distributed Bragg reflectorstructured laser diode, which emitted the picosecond pulses with a pulse duration of 200 ps and a repetition rate of 350 MHz. During pre-amplifying, a first-order diffraction transimission acousto-optic modulatorwas used to generate the picosecond pulse bunches, and the repetition rate of the bunches was tunable from 10 kHz to 500 kHz. The picosecond pulse bunch laser was power-amplified using a large mode area polarization maintaining Yb-doped fiber. A high power linearly polarized laser was obtained with an average power of 83 W, a peak power of 12 kW, and an extinction ratio of better than 15 dB. The peak power of 12 kW was obtained under the 100 kHz repetition rate of the pulse bunch, which was composed of 350 sub-pulses. Compared with the conventional continuous wave pulsed lasers, the pulse bunches were able to be obtained by this system, which benefited the further increase of the peak power. This system can be applied to the area of laser micro-machining.