采用中心波长为975 nm半导体激光器(LD)抽运高掺铒氟化物双包层光纤Er∶ZBLAN,并在谐振腔内插入机械斩波器,获得了2.8 μm激光机械调Q输出。研究了激光器在不同抽运功率,不同工作频率条件下的输出特性,分析了脉冲分裂的原因。通过控制适当抽运功率,激光器工作在3.5 kHz条件下,获得了最大单脉冲能量84.5 m J,脉宽250.3 ns,峰值功率超过300 W的脉冲输出。 A high erbium doped double-clad fiber Er:ZBLAN was pumped by a 975 nm central laser (LD) laser and a mechanical chopper was inserted into the resonator to obtain a 2.8 μm laser mechanical Q output. The output characteristics of the laser under different pumping powers and operating frequencies are studied. The reason of the pulse splitting is analyzed. By controlling the pump power, the maximum pulse energy of 84.5 mJ, the pulse width of 250.3 ns and the peak power of more than 300 W were obtained by operating the laser at 3.5 kHz.