Photoinduced dichroism in chalcogenides: influence of temperature and light intensity

The results of an experimental study of temperature and light-intensity dep endence measurements of photoinduced linear dichroism of amorphous As2S3 ar e given. At temperatures close to the glass transition temperature, a light -intensity dependence of the saturation of the photoinduced dichroism (PDi) is observed. The build-up kinetics of the PDi are analysed as a function o f temperature and light intensity. These new data show that the so-called r eciprocity law is limited to a temperature range well below the glass trans ition temperature. As a consequence, any model that tries to explain the PD i and that makes use of this law will also be limited to that particular te mperature range. (C) 1999 Elsevier Science B.V. All rights reserved.