title: Measuring photorefractive trap density without the electro-optic effect.
abstract: Two optical beams can couple in a photorefractive crystal without using the electro-optic effect. Beam coupling is due to a spatially modulated absorption caused by the rearrangement of trapped charges. We use these gratings to determine the effective photorefractive trap density for several barium titanate crystals.
authors.affiliation: Department of Physics, University of Southern California, University Park, Los Angeles, California 90089-0484, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Pierce
authors.forename: R S
authors.initials: RS
authors.lastname: Cudney
authors.forename: G D
authors.initials: GD
authors.lastname: Bacher
authors.forename: J
authors.initials: J
authors.lastname: Feinberg