By investigating light-induced charge changes of defects in BaTiO3 (BT) and Ba0.77Ca0.23TiO3 (BCT), using a combination of EPR and fast optical absorption spectroscopy at low and room temperature, we identify the charge transfer paths and their properties for the following systems: BT:Fe, BCT:Fe, BT:Cr and BT:Rh. In the latter case it is proved that codoping with Na increases the infrared response and the photorefractive speed of the material.

© 1999 Optical Society of America

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