Xian Tianhao, Zhan Li, Gao Lirun, Zhang Wenyan, Zhang Wenchao
Opt Lett. 2019 Feb 15;44(4):863-866. doi: 10.1364/OL.44.000863.
We propose and demonstrate a passively Q-switched Er-doped fiber laser based on pure water as the saturable absorber (SA). The SA is made of two optical ferrules matched with a cannula, and the gap between the end-facets is filled with pure water. The nonlinear response of this SA has been characterized, and stable Q-switching operation at 1558.03 nm has been achieved. The maximum output power is 21.1 mW with 65.0 kHz repetition rate. The duration is 1.44 μs, and the pulse energy reaches 324.8 nJ. To the best of our knowledge, this is the first demonstration of the passively Q-switched laser with pure water as the SA. It provides further evidence of the possibility of liquid as an effective SA for pulsed lasers.
我们提出并展示了一种基于纯水作为可饱和吸收体（SA）的被动调Q掺铒光纤激光器。该可饱和吸收体由两个与套管匹配的光学插芯制成，端面之间的间隙填充纯水。已对该可饱和吸收体的非线性响应进行了表征，并在1558.03nm处实现了稳定的调Q运转。最大输出功率为21.1mW，重复频率为65.0kHz。脉宽为1.44μs，脉冲能量达到324.8nJ。据我们所知，这是首次展示以纯水作为可饱和吸收体的被动调Q激光器。它进一步证明了液体作为脉冲激光器有效可饱和吸收体的可能性。
