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报道了一种基于光纤可饱和吸收体的纳秒脉冲掺铥全光纤双腔激光器。该激光器采用线型双腔结构,采用1550nm连续光纤激光器作为抽运源,以光纤布拉格光栅作为波长选择器件,利用掺铥光纤的可饱和吸收特性,同时结合双谐振腔间的相互作用,获得稳定的纳秒脉冲输出。分别采用单包层铥钬共掺光纤和双包层掺铥光纤作为增益介质,研究二者对激光输出性能的影响,并进行优化对比,最终实现平均功率为256.3mW,最窄脉宽为87ns的1993nm激光输出,脉冲重复频率在20.0~33.3kHz范围内可调。
A nanosecond pulse-doped all-fiber dual cavity laser based on fiber saturable absorber is reported. The laser adopts a linear dual-cavity structure, adopts a 1550nm continuous fiber laser as a pumping source, and uses a fiber Bragg grating as a wavelength selection device. By utilizing the saturable absorption characteristic of the doped fiber and combining with the interaction between the dual resonant cavities, the laser can be stabilized Nanosecond pulse output. The effects of the two on the laser output performance were studied by using the single-clad 铥 holmium co-doped fiber and the double-clad 铥 doped fiber as the gain medium respectively. The optimal power was 256.3mW and the narrowest pulse width was 87ns Of the 1993nm laser output, pulse repetition frequency adjustable in the range of 20.0 ~ 33.3kHz.