Abstract

Recent experimental and theoretical results indicate that the photorefractive properties of barium titanate are influenced by the presence of secondary photorefractive centers.^1-4 These are traps which are highly ionized at room temperature but can become populated by illumination with light. We have also attributed an intensity-dependence in the absorption coefficient to these traps.⁴ In this paper we study the secondary photorefractive centers by measuring the spectral and temporal characteristics of the photo-induced absorption.

© 1988 Optical Society of America