报道了一种基于光纤被动调Q 的纳秒脉冲铒镱双掺全光纤激光器，该激光器采用线型双腔结构，利用单模双包层铒镱双掺光纤的可饱和吸收特性，同时结合谐振腔间的相互作用，获得高效、稳定的纳秒脉冲输出。最终能够实现平均功率为2.2 W、最窄脉宽为173 ns的1570 nm 激光输出，脉冲重复频率在14~156 kHz范围内可调。

A nanosecond Er/Yb co-doped all-fiber dual-cavity laser with fiber-based passive Q-switch is reported. The laser oscillator is constructed in a linear dual-cavity, and can achieve the efficient, stable nanosecond operation based on the saturable absorber of the single- mode double- cladding Er/Yb co- doped fiber and the crossmodulation of the dual-cavity. The maximum output power is 2.2 W, and the minimum pulse duration is 173 ns with the central wavelength of 1570 nm. Meanwhile, sequential nanosecond pulses can be obtained at the repetition rate of 14~156 kHz.