Coherent Backscattering with Nonlinear Atomic Scatterers
T. Wellens, B. Gremaud, D. Delande, C. Miniatura
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 inelastic two-photon scattering processes. Here, coherent backscattering can be formed by interference between 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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