Abstract

Spectral and temporal characteristics of light-induced absorption for an undoped and a Rh-doped as-grown ${\mathrm{BaTiO}}_3$ crystal were investigated and compared. Two dark-decay time constants corresponding to two shallow levels were observed: 40 ms and 1.2 s for undoped ${\mathrm{BaTiO}}_3$ and 39 ms and 3.4 s for Rh-doped ${\mathrm{BaTiO}}_3.$ The light-induced absorption spectra were resolved into two components according to the dark-decay time constants. The resolved spectra reveal that one shallow level in Rh-doped ${\mathrm{BaTiO}}_3$ and one in undoped ${\mathrm{BaTiO}}_3$ are caused by a same impurity defect. The thermal activation energies of these levels were determined to be 0.53 and 0.7 eV for undoped ${\mathrm{BaTiO}}_3$ and 0.57 and 0.8 eV for Rh-doped ${\mathrm{BaTiO}}_3.$ The 0.8-eV shallow level in ${\mathrm{BaTiO}}_3:\mathrm{Rh}$ is caused by ${\mathrm{Rh}}^{4+/5+};$ the other level, 0.57 eV, is the one that has the same defect origin as the 0.53 eV level in undoped ${\mathrm{BaTiO}}_3.$ Other parameters for the shallow levels are also given.

© 1998 Optical Society of America

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