Abstract

We report on continuous-wave (CW) and rhenium diselenide (${\mathrm{ReSe}}_2$) $Q$-switched dual-wavelength mid-infrared (MIR) laser performances of Er:YAP crystal in this Letter. Under an absorbed pump power of 5.5 W, a maximum CW Er:YAP laser output power of 1.02 W is obtained, corresponding to a slope efficiency of 25.3%. With multilayer ${\mathrm{ReSe}}_2$ material as a saturable absorber, a stable $Q$-switched Er:YAP crystal laser with dual-wavelength output of 2.73 and 2.80 μm is realized for the first time, to the best of our knowledge. The nonlinear optical measurements of the multilayer ${\mathrm{ReSe}}_2$ reveal efficient saturable absorption properties around 3 μm showing a modulation depth of 7.5% and a saturation intensity of $14.5\mathrm{\mu J}/{\mathrm{cm}}^2$. The maximum $Q$-switching output power reaches 526 mW, and the corresponding laser power jitter is around 3% in 1 h. The shortest pulse duration and the highest pulse repetition rate are 202.8 ns and 244.6 kHz, respectively. These results prove that Er:YAP crystal could be a reliable laser crystal for MIR solid-state lasers.

© 2019 Optical Society of America

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