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
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