Widely tunable long-wave infrared difference frequency generation with a BaGa 4 Se 7 crystal

We report an experimental study of long-wave infrared difference frequency generation based on crystal. The sources of two input wavelengths were the fundamental output of a Nd:YAG laser and its second-harmonic pumped ∼1.2µ optical parametric oscillator. A wide tuning range of 7.9-17.5 µm (>1.14...

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Published inApplied optics. Optical technology and biomedical optics Vol. 60; no. 35; p. 10984
Main Authors Liu, Pengxiang, Li, Wei, Qi, Feng, Guo, Liyuan, Li, Weifan, Fu, Qiaoqiao, Niu, Chuncao, Xia, Mingjun, Yao, Jiyong
Format Journal Article
LanguageEnglish
Published United States 10.12.2021
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Summary:We report an experimental study of long-wave infrared difference frequency generation based on crystal. The sources of two input wavelengths were the fundamental output of a Nd:YAG laser and its second-harmonic pumped ∼1.2µ optical parametric oscillator. A wide tuning range of 7.9-17.5 µm (>1.14 octave) was achieved, which reached the upper limit of the transparency region. The spectra and pulse widths, input-output relationship, beam profile, wavelength tolerance, and angular acceptance of the phase-matching were characterized in detail. This presented coherent source can potentially be applied in multiple gas analyses and spectral imaging.
ISSN:2155-3165
DOI:10.1364/AO.446136