We present a method to separate the effects of trap gratings and electro-optic gratings in BaTiO3 crystals, and we determine the true spatial shift between the electro-optic grating and the optical intensity pattern. At small beam-crossing angles this spatial shift is strongly affected by a photogalvanic current in the crystal.
© 1992 Optical Society of America
Original Manuscript: August 23, 1991
Published: January 1, 1992
R. S. Cudney, G. D. Bacher, R. M. Pierce, and Jack Feinberg, "Measurement of the photorefractive phase shift," Opt. Lett. 17, 67-69 (1992)