Abstract

Our observations of Bi2SiO20 show that refractive-index gratings can decay under uniform illumination at two separats rates. This paper presents calculations based on a model of photorefractivity with two photoactive levels that provides a natural explanation of the two-time constant grating decay. In these calculations the usual conduction or valence band model of a single-species photorefractive material1 is. generalized to include a second species of traps in which the charge carriers can recombine.

© 1983 Optical Society of America

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