We analyze analytically and numerically the mechanism for modulational instability of the resonance excitation of a space-charge field by a moving light pattern in a photorefractive sillenite crystal to explain the results of recent experiments with Bi<sub>12</sub>SiO<sub>20</sub> crystals.
© 1999 Optical Society of America
B. I. Sturman, E. V. Podivilov, A. I. Chernykh, K. H. Ringhofer, V. P. Kamenov, H. C. Pedersen, and P. M. Johansen, "Instability of the resonance excitation of space-charge waves in sillenite crystals," J. Opt. Soc. Am. B 16, 556-564 (1999)