The photorefractive effects of Fe and Fe+Ce doped LiTaO3 single crystal Original Research Article

LiTaO3 single crystals doped with Fe and Ce transition metals were grown by the Czochralski method. The variations of birefringence change with light irradiation time were measured with the variation of light intensity, the concentration of transition metals, heat treatment and poling condition. The absorption coefficients were also examined in the UV–VIS wavelength range and compared with the results of the birefringence change. The saturated value of the birefringence change in Fe:LiTaO3 had a proportional relationship with light intensity and the concentration of doped transition metal, and in poled Fe:LiTaO3, the variation degree of Δ(ne−no) can be estimated by the magnitude of the absorption band which represents the transition state of the doped metal.