A multi-wavelength mid-IR laser based on BaGa4Se7 optical parametric oscillators

• DOI: 10.3389/fphy.2023.1126773
• Publication Date: 2023-03-27T05:42:17Z
• Authors: Ying Deng; Minqiang Kang; Zhenguo Wang; Jianbin Li; Xinying Jiang; Kaibo Xiao; Song Zhou; Fan Zhang; Xiangjun Xiang; Zhitao Peng; Jiyong Yao; Qihua Zhu; Guoying Feng
• Keywords: nonlinear optics materials; BaGa4Se7 crystal; Physics; QC1-999; mid-IR lasers; nonlinear optics; parametric oscillators; 7. Clean energy

A multi-wavelength mid-IR laser consisting of 3.05 μm, 4.25 μm, and 5.47 μm BaGa4Se7(BGSe)optical parametric oscillators (OPOs) switched by DKDP electro-optic switches with one 10 Hz/7.6 ns pumping wave is demonstrated. Maximum energies at 3.05 μm, 4.25 μm, and 5.47 μm are 1.35 mJ, 1.03 mJ, and 0.56 mJ, respectively, corresponding to optical-to-optical conversion efficiencies of 9.4%, 7.6%, and 4.2%. To the best of our knowledge, this study is the first of generation of three mid-IR wavelength lasers using electro-optic switches. Furthermore, this study provides a viable solution for a high-energy or high-power, compact, or even portable multi-wavelength mid-IR laser device that employs a single pumping wave.