A passively Q-switched fiber laser near 2 μm band was obtained based on semiconductor saiurablc absorber mirror and fiber grating. The central wavelength of the laser was 1 958. 2 nm. The pulse repetition rate of output signal increases with the rise of incident pump power, but the pulse width decreases. The pulse repetition rate was in the range of 20 kHz to 80 kHz and the pulse width was changed from 490 ns to μS. When the incident pump power was 1. 3 W, the maximum output power of the Q-switched fiber laser was 91 mW. the pulse repetition rate was 80 kHz, the pulse width was 490 ns and the single pulse energy was 1. 14μJ%基于半导体可饱和吸收镜和光纤光栅实现了稳定的2μm波段被动调Q光纤脉冲激光器,输出激光的中心波长为1958.2nm.随着泵浦功率的增加,输出脉冲的重复频率不断增加,而对应脉冲的宽度不断减小.输出脉冲重复频率的变化范围为20～80 kHz,脉冲宽度的变化范围为490 ns～1μs.当泵浦功率为1.3W时,调Q光纤激光器的最大平均输出功率为91 mW,脉冲重复频率为80 kHz,脉冲宽度为490 ns,对应的最大单脉冲能量约为1.14 μJ.
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