Time evolution of transient gratings in a nonlinear film above the surface of a disordered medium

Agranovich, V. M.; Chernyak, Vladimir; Grigorishin, K.I.; Ogievetsky, E.I.

doi:10.1016/0375-9601(92)90053-o

Cited by 6 publications

(2 citation statements)

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“…Meanwhile, the question concerning the way in which the nonlinearity affects the multiple-scattering speckle pattern still remains open and continue to attract the researches. Considerable efforts have been made to understand the phenomena of coherent backscattering in disordered media with Kerr-type nonlinearity: [55][56][57] a narrow dip has been predicted to appear on the top of the backscattering peak. Weak localization effects are shown to exist in the radiation of second harmonic and difference frequency, 56,[58][59][60] though their experimental observation failed.…”

Section: Introductionmentioning

confidence: 99%

“…Considerable efforts have been made to understand the phenomena of coherent backscattering in disordered media with Kerr-type nonlinearity: [55][56][57] a narrow dip has been predicted to appear on the top of the backscattering peak. Weak localization effects are shown to exist in the radiation of second harmonic and difference frequency, 56,[58][59][60] though their experimental observation failed. 61 Also studied with account for disorder is the optical phase conjugation.…”

Section: Introductionmentioning

confidence: 99%

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Temporal fluctuations of waves in weakly nonlinear disordered media

Skipetrov¹

2001

Phys. Rev. E

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We consider the multiple scattering of a scalar wave in a disordered medium with a weak nonlinearity of Kerr type. The perturbation theory, developed to calculate the temporal autocorrelation function of scattered wave, fails at short correlation times. A self-consistent calculation shows that for nonlinearities exceeding a certain threshold value, the multiple-scattering speckle pattern becomes unstable and exhibits spontaneous fluctuations even in the absence of scatterer motion. The instability is due to a distributed feedback in the system "coherent wave + nonlinear disordered medium". The feedback is provided by the multiple scattering. The development of instability is independent of the sign of nonlinearity.

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