Preparation and properties of GeSe2-Ga2Se3-KBr new chalcohalide glasses

A series of novel GeSe2-Ga2Se3-KBr chalcohalide glasses were prepared and the glass-forming region was determined. The evolution of glass structure was studied by Raman spectra. The optical and the thermal properties of glasses were investigated. The results show that these chalcohalide glasses have a broad transparent region in the entire 0.6–16 μm spectral region. At least 35 mol% KBr can be dissolved into the glasses and the absorption edge of the glass shifts towards short-wavelength direction with increasing amount of KBr. The glasses have relatively high glass transition temperatures (Tg = 290–350 °C) and good thermal stability. These properties make them promising candidate materials for infrared optics.