Abstract

We study spatiotemporal instabilities in a bulk medium with Kerr-type nonlinearity and a volume Bragg grating along the direction of wave propagation. The continuous-wave beam propagation is unstable in such a periodic structure because of an interplay among grating-induced dispersion, diffraction, and nonlinear phase modulation. A linear stability analysis of the nonlinear coupled-mode equations predicts parameters for which novel self-pulsations that occur in both time and space can be observed experimentally.

© 2001 Optical Society of America

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