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
- Received 23 August 2002
DOI:https://doi.org/10.1103/PhysRevE.67.016601
©2003 American Physical Society