title: Critical slowing down of space-charge field relaxation in photorefractive sillenites.
abstract: We propose a theoretical model for the recently reported anomalously long decay of a space-charge field that was resonantly excited in a photorefractive sillenite crystal [Phys. Rev. Lett. 79, 67 (1997)]. The model is based on the conventional concept of charge transfer and does not require excessively large values of the quality factor for space-charge waves. The effect in question is qualified as a critical slowing of the relaxation process as the threshold of optical oscillation is approached.
authors: B I
authors: BI
authors: Sturman
authors: E V
authors: EV
authors: Podivilov
authors: H C
authors: HC
authors: Pedersen
authors: P M
authors: PM
authors: Johansen