One possible way to couple the orthogonally polarized waves (ordinary wave with wavevector ko and extraordinary wave with wavevector ke) in photorefractive crystal is to record a grating with grating vector K = ke − ko and to assure the conditions of anisotropic diffraction (i.e., diffraction with change of polarization of diffracted wave to orthogonal with respect to the readout wave).1

© 1992 Optical Society of America

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