Photodarkening in the nano- and microsecond domain: measurements of transient photoinduced absorption spectra of amorphous and liquid As2Se3

摘要

Photodarkening in the nano- and microsecond domain was observed in amorphous As2Se3 from measurements of the transient photoinduced optical absorption spectra in the high absorption region using a specially designed optical cell which prepared a submicrometre-size melt-quenched amorphous film. This photodarkening was also observed in the liquid state. The observed optical change suggests the presence of a photoinduced structural change in the time domain. The origin of this photodarkening is discussed.