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Production et étude de lasers à atomes guidés, et de leur interaction avec des défauts contrôlés

Abstract : In this thesis, we expose a new experimental setup designed to produce rubidium Bose-Einstein condensates in a crossed dipole trap, and experiments dealing with the production and manipulation of optically guided atom lasers from these condensates. The optical potential used to trap the atoms is independent of the ground-state sublevel they are in. We use this peculiarity to control their internal state with a spin-distillation technique, by applying magnetic-field gradients during the evaporation sequence. We present two new schemes to produce guided atom lasers based on the progressive spilling of the atoms out of the crossed trap and into an optical guide. We characterize the degree of occupation of the transverse modes of the guide for the atom lasers produced, together with the quality of the outcoupling, thanks to a thermodynamical analysis. Finally we show preliminary results concerning the interaction of these guided atom lasers with a defect of the guiding potential, created by the adjunction of a dipole potential whose shape and position is controlled. An analysis of this interaction is proposed, by means of a quantum scattering theory in confined space.
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Contributor : Antoine Couvert <>
Submitted on : Saturday, December 19, 2009 - 1:25:39 PM
Last modification on : Monday, December 14, 2020 - 9:41:17 AM
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  • HAL Id : tel-00442294, version 1


Antoine Couvert. Production et étude de lasers à atomes guidés, et de leur interaction avec des défauts contrôlés. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨tel-00442294⟩



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