High power, tunable mid-infrared BaGa_4Se_7 optical parametric oscillator pumped by a 21 μm Ho:YAG laser Article Swipe

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Optical parametric oscillator Optics Laser Materials science Infrared Optical parametric amplifier Slope efficiency Range (aeronautics) Optoelectronics Optical amplifier Physics Fiber laser Composite material

Jinhe Yuan , Chao Li , Baoquan Yao , Jiyong Yao , Xiaoming Duan , Yingyi Li , Yingjie Shen , Yicheng Wu , Zheng Cui , Tongyu Dai ·

YOU? · · 2016 · Open Access · · DOI: https://doi.org/10.1364/oe.24.006083 · OA: W2295198547

We, for the first time, demonstrate a tunable mid-infrared BaGa<sub>4</sub>Se<sub>7</sub>-based optical parametric oscillator pumped by a acousto-optical Q-switched Ho:YAG laser at 2090.6 nm. Up to 1.55 W of average power was generated in the 3-5 μm range, corresponding to an optical-to-optical conversion efficiency of 14.4% and a slope efficiency of 19.9%. The mid-IR radiation spectra were also seriously researched at different phase-matched angles. The tunable range was 3.49-4.13 μm for the signal, and 5.19-4.34 μm for the idler.