dorsal/arxiv
View SchemaCoherent Backscattering of Light with Nonlinear Atomic Scatterers
| Authors | Thomas Wellens, Benoit Gremaud, Dominique Delande, Christian Miniatura |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0509114 |
| URL | https://arxiv.org/abs/quant-ph/0509114 |
| DOI | 10.1103/PhysRevE.71.055603 |
Abstract
We study coherent backscattering of a monochromatic laser by a dilute gas of cold two-level atoms in the weakly nonlinear regime. The nonlinear response of the atoms results in a modification of both the average field propagation (nonlinear refractive index) and the scattering events. Using a perturbative approach, the nonlinear effects arise from inelastic two-photon scattering processes. We present a detailed diagrammatic derivation of the elastic and inelastic components of the backscattering signal both for scalar and vectorial photons. Especially, we show that the coherent backscattering phenomenon originates in some cases from the interference between three different scattering amplitudes. This is in marked contrast with the linear regime where it is due to the interference between two different scattering amplitudes. In particular we show that, if elastically scattered photons are filtered out from the photo-detection signal, the nonlinear backscattering enhancement factor exceeds the linear barrier two, consistently with a three-amplitude interference effect.
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"abstract": "We study coherent backscattering of a monochromatic laser by a dilute gas of\ncold two-level atoms in the weakly nonlinear regime. The nonlinear response of\nthe atoms results in a modification of both the average field propagation\n(nonlinear refractive index) and the scattering events. Using a perturbative\napproach, the nonlinear effects arise from inelastic two-photon scattering\nprocesses. We present a detailed diagrammatic derivation of the elastic and\ninelastic components of the backscattering signal both for scalar and vectorial\nphotons. Especially, we show that the coherent backscattering phenomenon\noriginates in some cases from the interference between three different\nscattering amplitudes. This is in marked contrast with the linear regime where\nit is due to the interference between two different scattering amplitudes. In\nparticular we show that, if elastically scattered photons are filtered out from\nthe photo-detection signal, the nonlinear backscattering enhancement factor\nexceeds the linear barrier two, consistently with a three-amplitude\ninterference effect.",
"arxiv_id": "quant-ph/0509114",
"authors": [
"Thomas Wellens",
"Benoit Gremaud",
"Dominique Delande",
"Christian Miniatura"
],
"categories": [
"quant-ph",
"cond-mat.dis-nn"
],
"doi": "10.1103/PhysRevE.71.055603",
"title": "Coherent Backscattering of Light with Nonlinear Atomic Scatterers",
"url": "https://arxiv.org/abs/quant-ph/0509114"
},
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