OPTICAL AND PHOTOREFRACTIVE CHARACTERIZATION OF BTO CRYSTALS DOPED WITH CD, CA, GA, AND V

Single crystals of Bi12TiO20 (BTO) are grown by a modified Czochralski technique. Doping with cadmium, calcium, gallium, and vanadium is per formed by adding corresponding oxides to the melt. Optical parameters like refractive index, optical absorption, optical activity, light ind uced absorption, electrooptic coefficient, and photoconductivity are d etermined. Photorefractive properties of the samples are characterized with the help of a conventional two-beam interference setup. Diffract ion efficiency and decay time constant of elementary holograms are det ermined. The influence of the utilized dopands is discussed.