Instabilities of waves in nonlinear disordered media

Details Instabilities of waves in nonlinear disordered media Instabilities of waves in nonlinear disordered media

2000-06-08

arxiv.org/abs/cond-mat/0006136v1

Phys. Rev. Lett. 85, 736 (2000)

Physics

Condensed Matter

Disordered Systems and Neural Networks

6 pages, 2 PostScript figures, accepted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.85.736

We develop a self-consistent theory of temporal fluctuations of a speckle pattern resulting from the multiple scattering of a coherent wave in a weakly nonlinear disordered medium. The speckle pattern is shown to become unstable if the nonlinearity exceeds a threshold value. The instability is due to a feedback provided by the multiple scattering and manifests itself in spontaneous fluctuations of the scattered intensity. The development of instability is independent of the sign of nonlinearity.

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