Abstract

Intensity dependent absorption and photorefractive effects have recently been observed at low intensities in barium titanate crystals [1, 2]. Also, there is some evidence that recombination centers other than iron impurities exist in BaTiO₃ and contribute to the photorefractive effect [3, 4]. The model we present here assumes the existence of primary deep level traps such as iron and secondary shallow traps as shown in Fig. 1. We show that this model predicts the intensity dependence in BaTiO₃.

© 1987 Optical Society of America