GeSe2-Ga2Se3-CsI chalcohalide glasses are synthesized, and their optical properties and thermo-mechanical properties are studied. A typical characteristic of the glasses is their excellent transparency in the red-light region in addition to the 8-14 mu m atmospheric window, which is of vital importance to the quality control of infrared systems. The short-wavelength absorption edge lambda(s) of the glass system has a distinct blue shift with increasing CsI content, and the physicochemical interpretations are suggested and formulated. These glasses present a glass transition temperature (T-g) around 300 degrees C and good thermal stability. Consequently, they can be promising candidate materials for infrared optics, although their hardness is relatively weak.