LIGHT-INDUCED ABSORPTION IN PHOTOREFRACTIVE BARIUM-TITANATE DOPED WITH RHODIUM

The light-induced absorption of barium titanate doped with rhodium (Ba TiO3:Rh) is characterized in near-infrared spectral region. It decreas es with the wavelength of the probe beam from 700 to 840 nm, and is si gnificantly dependent on the polarization of the probe beam and insens itive to the polarization of the pump beam. The light-induced absorpti on as high as 0.32 cm(-1) is obtained for ordinary-polarized probe bea m tit lambda = 730 nm. The observations are interpreted by the photore fractive two-center or one center with three valence states model.