VEYRON, Romain; MANCOIS, Vincent; GERENT, Jean-Baptiste; BACLET, Guillaume; BOUYER, Philippe; BERNON, Simon

doi:10.1103/PhysRevResearch.4.033033

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VEYRON, Romain
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

MANCOIS, Vincent
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

GERENT, Jean-Baptiste
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

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Article de revue

Ce document a été publié dans

Phys.Rev.Res. 2022, vol. 4, n° 3, p. 033033

Résumé en anglais

Absorption imaging is a commonly adopted method to acquire, with high temporal resolution, spatial information on a partially transparent object. It relies on the interference between a probe beam and the coherent response of the object. In the low saturation regime, it is well described by a Beer Lambert attenuation. In this paper we theoretically derive the absorption of a $\sigma$ polarized laser probe by an ensemble of two-level systems in any saturation regime. We experimentally demonstrate that the absorption cross section in dense $^{87}$Rb cold atom ensembles is reduced, with respect to the single particle response, by a factor proportional to the optical density b of the medium. To explain this reduction, we developed a model that incorporates, in the single particle response, the incoherent electromagnetic background emitted by the surrounding ensemble. We show that it qualitatively reproduces the experimental results. Our calibration factor that has a universal dependence on optical density $b$ for $\sigma$ polarized light : $\alpha$ = 1.17(9) + 0.255(2)b allows to obtain quantitative and absolute, in situ, images of dense quantum systems.< Réduire

Mots clés en anglais

density

optical

cross section

absorption

background

electromagnetic

saturation

imaging

attenuation

laser

calibration

experimental results

coherence

interference

channel cross section

ratio

atom

resolution

URI

https://oskar-bordeaux.fr/handle/20.500.12278/181374

DOI

http://dx.doi.org/10.1103/PhysRevResearch.4.033033

Project ANR

Atomes Ultra-Froids piégés dans des Réseaux Optiques Nano-Structurés - ANR-18-CE47-0001
Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003

Origine

Importé de hal

Unités de recherche

Laboratoire Photonique, Numérique et Nanosciences (LP2N) - UMR 5298