Abstract

The correct determination of the spatial phase shift ϕp in photorefractive materials is crucial to the proper characterization of novel materials. It is shown that the grating translation techniques commonly used for the measurement of ϕp need to be reevaluated for high-gain materials. Strong energy and phase coupling leads to nonuniform slanted gratings, which result in an apparent dependence of the phase shift of the beam ratio and the optical polarization. A revised theory is presented, and analytical solutions are obtained for the special case of ϕpπ/2. Numerical solutions for arbitrary ϕp are in good agreement with measurements in a photorefractive polymer.

© 1997 Optical Society of America

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