Critical discussion of models proposed to explain photo-induced anisotropies in chalcogenide glasses

摘要

Different theories explaining the origin and the mechanism of the dynamic part of photo-induced anisotropies which are observed in a large family of chalcogenide glasses will be discussed and analyzed. It is useful to distinguish two kinds of photo-induced anisotropies, Type 1 which involves a limited concentration of bistable anisotropic defects or centers and Type 2 which encompasses most of the materials.