Preparation and properties of novel GeS_2-Ga(In) _2S_3-CuI chalcohalide glasses

摘要

Novel GeS_2-Ga(In)_2S_3-CuI chalcohalide glasses were prepared successfully. These glasses have relatively high glass transition temperatures up to 452 °C but narrow glass-forming region, and a wide range of transmission approximately from 0.50 to 12.5μm. 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 β 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.