【摘要】 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。更多还原

【Abstract】 A high power actively Q-switched mid-infrared fiber laser at 2.8-mm waveband is demonstrated by employing a 975 nm laser-diode pumping a piece of heavily Er³⁺-doped ZBLAN doubleclad fiber and a mechanical chopper into the cavity as the Q-switch. Output characteristics at different pump powers and various repetition rates is investigated. Meanwhile, the pulse spikes are observed and analyzed. The maximum pulse energy of 84.5 μJ, pulse duration of 250.3 ns and peak power of exceeding 300 W is obtained at a repetition rate of 3.5 k Hz under a proper pump power.更多还原