Preparation and properties of novel GeS2-Ga(In)2S3-CuI chalcohalide glasses

Novel GeS2-Ga(In)(2)S-3-CuI chalcohalide glasses were prepared successfully. These glasses have relatively high glass transition temperatures up to 452 degrees C but narrow glass-forming region, and a wide range of transmission approximately from 0.50 to 12.5 mu m. The structural evolvement of the glasses was studied by Raman spectroscopy. Finally, third-order optical nonlinearities were investigated utilizing Z-scan technique at the wavelength of 800nm. Both nonlinear refractive index n(2) and nonlinear absorption coefficient beta show an increasing tendency with increasing CuI content or substituting In for Ga, and structural dependency of n(2) has also been discussed. A minimum figure of merit FOM = 2.237 was obtained.