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We present concrete evidence for the formation of ferroelectric domain gratings induced by photorefractive space-charge electric fields in top-seeded solution-grown barium titanate crystals. These domain gratings are not destroyed by light and, by applying a field, can be reconverted into photorefractive gratings that diffract much more light than the photorefractive gratings that create them, as much as 67% of an incident beam.

For two decades after the discovery of its ferroelectric properties, barium titanate was intensively studied as a representative of compounds with a first-order ferroelectric phase transition’and also for its polarization reversal properties which made it a candidate for memory devices.’Most of these measurements were performed on fluxgrown3 “butterfly wing” crystals. Later on, it was discovered that photorefractive gratings could be induced in barium titanate by exposing it to an interference …