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Coherent Backscattering with Nonlinear Atomic Scatterers

T. Wellens·B. Gremaud·D. Delande·C. Miniatura
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Abstract

We study coherent backscattering of a quasi-monochromatic laser by a dilute gas of cold two-level atoms. We consider the perturbative regime of weak intensities, where nonlinear effects arise from {\em inelastic} two-photon scattering processes. Here, coherent backscattering can be formed by interference between {\em three} different scattering amplitudes. Consequently, if elastically scattered photons are filtered out from the photodetection signal by means of suitable frequency-selective detection, we find the nonlinear backscattering enhancement factor to exceed the linear barrier two.

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T. Wellens, B. Gremaud, D. Delande, C. Miniatura. 2004-11-22. Coherent Backscattering with Nonlinear Atomic Scatterers. https://arxiv.org/abs/cond-mat/0411555

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