title: Transverse modulational instability of periodic light patterns in photorefractive strontium barium niobate crystal.
abstract: Interference fringes produced by the intersection of two plane waves in photorefractive strontium barium niobate crystal break in the transverse direction if the external electric field is high enough. For a certain relation between fringe spacing and nonlinearity strength, the tendency to regular pattern formation has been observed. We present a simple theory that qualitatively explains this effect.
authors.forename: A
authors.initials: A
authors.lastname: Apolinar-Iribe
authors.forename: N
authors.initials: N
authors.lastname: Korneev
authors.forename: V
authors.initials: V
authors.lastname: Vysloukh
authors.forename: C M
authors.initials: CM
authors.lastname: Gómez-Sarabia