中文摘要：

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。

英文摘要：

A nanosecond Tm-doped all-fiber dual-cavity laser with fiber-based saturable absorber is reported. The laser oscillator is constructed in a linear dual-cavity. The system uses a 1550 nm continuous-wave fiber laser as the pump source and fiber Bragg gratings as the wavelength-selective devices. Based on the saturable absorption characteristics of the Tm-doped fiber and the unique design of dual-cavity, the stable nanosecond operation is achieved. Meanwhile, the effect of the single-cladding Ho-Tm co-doped fiber and double-cladding Tin-doped fiber as the gain media on the laser output performance is studied. The maximum output power of the system is 256.3 mW, and the minimum pulse duration is 87 ns with the central wavelength of 1993 nm. The sequential nanosecond pulses can be obtained at the repetition rate of 20.0-33.3 kHz.