Yao Bo, Zhang Dong, Zhang Ji, Wei Shanshan, Lin Xuechun, Mao Qinghe
Opt Express. 2019 Sep 16;27(19):27345-27353. doi: 10.1364/OE.27.027345.
This paper proposes and demonstrates a novel method to produce the narrow-bandwidth, narrow-pulse-width and high-repetition-rate pulses with actively Q-switched ring-cavity all-fiber lasers. By using a specially designed low-reflectivity cladding power stripper in the cavity, and inserting a length-optimized ytterbium-doped single-cladding fiber self-pumped by the backward amplified spontaneous emission (ASE) from the YDF to improve the amplification of the initial weak ASE feedback by the narrowband filter, the ASE gain self-saturation can be suppressed efficiently, and the lasing pulses can be established quickly within the opening time of Q-switch even operating for very high repetition-rate. With the proposed technique, watt-level Q-switched pulses with bandwidth and pulse width narrowed to 0.15 nm and 9 ns, and repetition rate up to 175 kHz are achieved.
本文提出并演示了一种利用主动调Q环形腔全光纤激光器产生窄带宽、窄脉宽和高重复率脉冲的新方法。通过在腔内使用专门设计的低反射率包层功率剥离器，并插入一段长度优化的掺镱单包层光纤，该光纤由掺镱光纤（YDF）的后向放大自发辐射（ASE）自泵浦，以通过窄带滤波器改善初始弱ASE反馈的放大，从而可以有效地抑制ASE增益自饱和，并且即使在非常高的重复率下工作，也能在Q开关的开启时间内快速建立激光脉冲。采用所提出的技术，实现了瓦级调Q脉冲，其带宽和脉宽分别窄至0.15nm和9ns，重复率高达175kHz。
