Abstract

Interband photoexcitation in photorefractive ABO₃ perovskites has only recently attracted the attention of researchers. Band to band excitation of electrons can lead to fast photorefractive response times [1] and, through trapping, to the sensitisation of impurity levels in the band gap. Strong effects are observed that lead to cw photorefractive response times on the microsecond time scale [1]. Absorption changes at visible wavelengths induced by uv illumination have been observed in BaTiO₃ [2].

© 1996 IEEE