We report measurements of the photorefractive phase shift and coupling constant of several photorefractive materials. We solve the problem of beam coupling and diffraction in a material with a dynamically written grating for arbitrary input beams. These solutions are used to determine the beam coupling as a function of the photorefractive phase ϕ and coupling constant g when one beam is either sinusoidally phase modulated or ramped in phase. Experimental results are obtained for LiNbO3, BaTiO3, and for paraelectric potassium lithium tantalate niobate as a function of applied electric field.
© 1993 Optical Society of America
Original Manuscript: November 11, 1992
Published: April 1, 1993
Rudolf Hofmeister, Amnon Yariv, Anthony Kewitsch, and Shogo Yagi, "Simple methods of measuring the net photorefractive phase shift and coupling constant," Opt. Lett. 18, 488-490 (1993)