Langevin description of speckle dynamics in nonlinear disordered media
- 6 January 2003
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review E
- Vol. 67 (1), 016601
- https://doi.org/10.1103/physreve.67.016601
Abstract
We formulate a Langevin description of dynamics of a speckle pattern resulting from the multiple scattering of a coherent wave in a nonlinear disordered medium. The speckle pattern exhibits instability with respect to periodic excitations at frequencies below some provided that the nonlinearity exceeds some -dependent threshold. A transition of the speckle pattern from a stationary state to the chaotic evolution is predicted upon increasing nonlinearity. The shortest typical time scale of chaotic intensity fluctuations is of the order of
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