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Abstract
We report on a laser system based on difference frequency generation (DFG) to produce tunable, narrow-linewidth (${\lt}{30}\;{\rm pm}$), and comparatively high-energy mid-IR radiation in the 6.8 µm region. The system exploits a lithium thioindate (${{\rm LiInS}_2}$) nonlinear crystal and nanosecond pulses generated by single-frequency Nd:YAG and Cr:forsterite lasers at 1064 and 1262 nm, respectively. Two experimental configurations are used: in the first one, single-pass, the mid-IR energy achieved is 205 µJ. Additional increments, up to 540 µJ, are obtained by performing double-pass through the nonlinear crystal. This laser has been developed for high-resolution photon-hungry spectroscopy in the mid-IR.
© 2020 Optical Society of America
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