Abstract

Evidence is presented to support the theory that photoexcited charge carriers screen the field due to the trapped charges that form the phase grating in photorefractive materials. The diffraction intensity due to the grating and the decay time constants of the trapped charges are influenced by this screening. Electric-field modulation of these effects is also present. The effects have been measured and compared to the expected generation rates of free and trapped charges.

© 1988 Optical Society of America

Experimental observations of trapping levels in BSO

Alfred E. Attard and Timothy X. Brown
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