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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.
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H. Fritzsche (2009) studied this question.
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