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 …