AgGaS2 is an excellent middle infrared nonlinear optical crystal, which has gained big applications at the middle and deep infrared wavelength due to its unique features. The crystal has low absorption coefficient, large effective opticalnonlinearity (d36=39pm/V), wide broad transparency range (0.73-21μm), especially its useful transmission ranges lying within 0.9-16μm and wide phase matchability provides excellent potential for OPO applications when pumped by variety of currently available lasers。

AgGaS2 high short wavelength transparency edging at 550nm has been used in OPO  pumped by Nd:YAG laser; in numerous difference frequency mixing experiments using diode, Ti:Sapphire, Nd:YAG and IR dye lasers covering 3-12 µm range; direct infrared countermeasure systems, and SHG of CO2 laser。
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