期刊
PHYSICAL REVIEW LETTERS
卷 85, 期 4, 页码 736-739出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.736
关键词
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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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