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Mid-infrared (5–12-µm) and limited (5.5–8.5-µm) single-knob tuning generated by difference-frequency mixing in single-crystal AgGaS2

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Abstract

We describe tunable 5–12-µm mid-infrared generation in single-crystal silver gallium sulfide (AgGaS2), from nonlinear optical difference-frequency generation. Signal and idler waves obtained from a Nd:YAG laser–pumped LiNbO3 optical parametric oscillator (OPO) were mixed in AgGaS2 crystal to yield difference-frequency waves. For the efficient generation of difference frequency, an unstable resonator was employed as the OPO to reduce output beam divergence. A maximum difference-frequency power of 95 µJ/pulse was obtained near 7.5 µm for a 1-cm-long AgGaS2 crystal. Spectral noncritical phase matching within a specific tuning range was also investigated that permitted limited single-knob tuning (5.5–8.5 µm) of the difference-frequency generator.

© 1999 Optical Society of America

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