High energy and tunable mid-infrared source based on BaGa4Se7 crystal by single-pass difference-frequency generation

Yixin He; Yangwu Guo; Degang Xu; Yuye Wang; Xianli Zhu; Jiyong Yao; Chao Yan; Longhuang Tang; Jining Li; Kai Zhong; Chang Liu; Xiaoli Fan; Yicheng Wu; Jianquan Yao

doi:10.1364/OE.27.009241

High energy and tunable mid-infrared source based on BaGa₄Se₇ crystal by single-pass difference-frequency generation

Opt Express. 2019 Mar 18;27(6):9241-9249. doi: 10.1364/OE.27.009241.

Authors

Yixin He, Yangwu Guo, Degang Xu, Yuye Wang, Xianli Zhu, Jiyong Yao, Chao Yan, Longhuang Tang, Jining Li, Kai Zhong, Chang Liu, Xiaoli Fan, Yicheng Wu, Jianquan Yao

PMID: 31052731
DOI: 10.1364/OE.27.009241

Abstract

A high-energy and tunable mid-infrared source based on BaGa₄Se₇ crystal was demonstrated by single-pass difference-frequency generation (DFG). Orthogonally polarized wave at 1064 nm (λ₁) and tunable idler wave (λ₂) generated by KTP-OPO, which could be tuned in the wavelength range of 1360-1600 nm, were used as the DFG dual-wavelength pump. The pump parameters including total pump energy and energy ratio were studied. Maximum pulse energy of 5.72 mJ at 3.58 μm was obtained at the dual-wavelength pump energy of 58.4 mJ/pulse. The wavelength tuning range was 3.36-4.27 μm with a flat tunability. Moreover, a saturation phenomenon of DFG output was observed and experimentally inferred to be related to the input energy of λ₂ in the BaGa₄Se₇ crystal.