Study of thermal and optical properties of GeS 2–Ga 2S 3–Ag 2S chalcogenide glasses

Abstract

Chalcogenide glasses in the GeS 2–Ga 2S 3–Ag 2S pseudo-ternary system were prepared by melt-quenching technique. The structural evolvement of the glasses was studied by Raman spectroscopy. The Raman results show that the addition of Ag 2S involves the breaking of [S 3Ge–GeS 3] ethane-like units and the formation of Ag–S ionic bonds. The results of differential scanning calorimetry (DSC) show that the glasses have relatively high-glass transition temperatures and good thermal stabilities. These GeS 2–Ga 2S 3–Ag 2S glasses have a wide range of transmission approximately from 0.50 to 12.5 μm. In addition, with the method of Maker fringe, SHG was observed in the 0.9GeS 2–0.05Ga 2S 3–0.05Ag 2S glass irradiated by an electron beam. The value of second-order nonlinear optical susceptibility d is as large as 6.6 pm/V, and the poling mechanism of electron beam irradiation was also discussed in this work.