Instabilities of waves in nonlinear disordered media |
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Authors: | Skipetrov Maynard |
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Institution: | Laboratoire de Physique et Modelisation des Milieux Condenses, Universite Joseph Fourier, Maison des Magisteres-CNRS, BP 166, 38042 Grenoble Cedex 9, France. |
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Abstract: | 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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