Abstract

We demonstrate that holographic recording in photorefractive materials can be improved by using a moving grating to reduce energy coupling. In cerium-doped Sr0.6Ba0.4Nb2O6 under an applied dc electric field, experimental and theoretical results show that the proper grating velocity can maximize the modulus and the real part of the space-charge field while reducing the imaginary component of the space-charge field (and energy coupling) to zero. Avoiding energy transfer between the recording beams allows us to maintain maximum contrast throughout the crystal, producing a uniform, high-index-modulation grating with enhanced diffraction efficiency and superposition properties.

© 1991 Optical Society of America

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