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Collective spontaneous emission from dense ensembles of two-level atoms

Antoine Glicenstein 1 
1 Laboratoire Charles Fabry / Optique Quantique
LCF - Laboratoire Charles Fabry
Abstract : We are interested in the problem of light scattering by dense ensembles of cold atoms in the so-called "Dicke regime", in which many atoms are trapped in a volume whose dimensions are smaller than the wavelength of the atomic transition. When the light has a frequency close to that of the atomic transition, it induces dipoles. In a dense medium, these dipoles interact with each other: each dipole is driven by the fields radiated by the other dipoles. These resonant interactions between the dipoles modify the collective response of the ensemble. In particular, they modify the rate at which the energy of the ensemble decays by spontaneous emission. A faster decay than that of a single atom is called superradiance and a slower one is called subradiance.In this thesis, we first develop experimental methods for the study of this problem. We build an experimental system in order to prepare, observe and manipulate clouds containing several thousand cold atoms in a regime close to Dicke’s regime. We isolate a closed two-level transition to get as close as possible to the ideal model described by Dicke. We then realize a in depth-study of the collective emission properties of these systems under resonant laser light, during and after driving. We observe super- and subradiant decay for the first time in this regime and show that they are governed uniquely by the number of atoms in the cloud. We have then characterized the collective Rabi oscillations of atomic ensembles under laser driving. Finally, we demonstrate a protocol for the on-demand release of excitations stored in subradiant states, which is a prerequisite for the realization of light storage. To conclude, a synthesis of the obtained results is made and perspectives for future research are proposed.
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Submitted on : Tuesday, February 22, 2022 - 12:46:24 PM
Last modification on : Saturday, June 25, 2022 - 11:13:00 AM
Long-term archiving on: : Monday, May 23, 2022 - 6:42:51 PM


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  • HAL Id : tel-03584259, version 1


Antoine Glicenstein. Collective spontaneous emission from dense ensembles of two-level atoms. Optics [physics.optics]. Université Paris-Saclay, 2022. English. ⟨NNT : 2022UPASP001⟩. ⟨tel-03584259⟩



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