aggas2 crystal is transparent from 0.5 to 13.2um. aggas2 crystal has been demonstrated to be an efficient frequency doubling crystal for infrared radiation, such as the 10.6 µm output of CO2 lasers. Silver Gallium Sulfide (aggas2, AGS) is very useful for middle and deep infrared applications due to its large nonlinear optical (NLO) coefficients and high transmission in the IR region.