Langevin description of speckle dynamics in nonlinear disordered media.
Langevin description of speckle dynamics in nonlinear disordered media.
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非线性无序介质中散斑动力学的朗之万描述。
DOI：
10.1103/physreve.67.016601
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
S. Skipetrov
中科院分区：
文献类型：
--
作者：
S. Skipetrov
我们制定了一个朗之万描述的动态散斑图案的相干波在非线性无序介质中的多次散射。的散斑图案表现出不稳定性，相对于周期性的激励频率ω低于一些Ω（最大值），提供的非线性超过一些Ω依赖的阈值。随着非线性的增加，散斑图将从稳态向混沌演化过渡。混沌强度波动的最短典型时间尺度为1/Omega（max）的量级。
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 Omega below some Omega(max), provided that the nonlinearity exceeds some Omega-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 1/Omega(max).