Abstract

We report an experimental study of long-wave infrared difference frequency generation based on ${{\rm BaGa} _{4}} {\rm Se}_7$ crystal. The sources of two input wavelengths were the fundamental output of a Nd:YAG laser and its second-harmonic pumped ${\sim}{1.2}\;\unicode{x00B5}{\rm m}$ ${{\rm KTiOPO}_{4}}$ optical parametric oscillator. A wide tuning range of 7.9–17.5 µm (${\gt} {1.14}$ octave) was achieved, which reached the upper limit of the ${{\rm BaGa}_{4}}{{\rm Se}_{7}}$ 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.

© 2021 Optica Publishing Group

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