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Widely tunable continuous-wave mid-infrared radiation (5.5–11 µm) by difference-frequency generation in LiInS2 crystal

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Abstract

The first demonstration, to the best of our knowledge, of continuous-wave (cw) difference-frequency generation (DFG) in LiInS2 crystal is reported. Wide spectral coverage (5.5–11.3 µm) has been obtained with angle and wavelength tuning for type II (eoe) critically phase-matched parametric interaction. The phase-matching conditions in cw DFG have been investigated, which allowed us to improve the Sellmeier parameters by use of a two-pole dispersion equation. An effective nonlinear coefficient deff = 6.9 ± 0.8 pm/V has been determined at ∼7 µm relative to the well-known nonlinear coefficient d36 of AgGaS2, which yields a power-conversion efficiency of ∼12.4 µW/(W2 cm). We evaluated the high-resolution spectral characteristics of the DFG source by recording C2H2 and SO2 spectra.

© 2005 Optical Society of America

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