Abstract

A complementary photorefractive grating was created and stored in BaTiO3. For a grating wave vector oriented along the crystal's c axis, the grating first appeared above 80°C and would remain indefinitely after the crystal was cooled to room temperature. If the grating wave vector was aligned perpendicular to the c axis, the complementary grating could be created at room temperature but would last only a few hours. We attribute the formation of the complementary grating to the movement of ions in the crystal.

© 1991 Optical Society of America

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