Wavelength dependence of the effective trap density in Rh-doped BaTiO_3: A comparison between theory and experiment

摘要

The wavelength dependence of the effective trap density N_(eff) of a BaTiO_3:Rh crystal has been studied theoretically and experimentally. The three-charge-state model and the two-beam coupling (TBC) were used for the theoretical and experimental studies, respectively. By comparing the theoretical and experimental results, we found that it is not enough to model the photorefractive effect in our BaTiO_3:Rh crystal with the three-charge-state model at long wavelengths.