Abstract

Spectral and temporal characteristics of light-induced absorption for ${\mathrm{BaTiO}}_3$ crystals undoped and doped with various amounts of Ce were investigated and compared. Dark decay of light-induced absorption with two time constants corresponding to two shallow levels was observed in all crystals investigated. Light-induced absorption spectra were then resolved into two components, slow and fast, according to the dark-decay time constants. The resolved spectra reveal that in all the undoped and Ce-doped crystals the two shallow levels have the same defect origins, independently of doping. The thermal activation energies of the two shallow levels were deduced to be $\sim 0.7$ and $\sim 0.5 \mathrm{eV}$ in all crystals, and the 0.7-eV shallow level is attributed to ${\mathrm{Fe}}^{4+/5+}.$ Some other important parameters for the two shallow levels were also determined.

© 1998 Optical Society of America

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