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Contribution à l'optique des ondes atomiques cohérentes - Conception de dispositifs multi-ondes

Abstract : The theoretical work presented in this manuscript addresses two complementary issues in coherent atom optics.

The first part addresses the perspectives offered by coherent atomic sources through the design of two experiment involving the levitation of a cold atomic sample in a periodic series of light pulses, and for which coherent atomic clouds are particularily well-suited. These systems appear as multiple wave atom interferometers. A striking feature of these experiments is that a unique system performs both the sample trapping and interrogation. To obtain a transverse confinement, a novel atomic lens is proposed, relying on the interaction between an atomic wave with a spherical light wave. The sensitivity of the sample trapping towards the gravitational acceleration and towards the pulse frequencies is exploited to perform the desired measurement. These devices constitute atomic wave resonators in momentum space, which is a novel concept in atom optics.

A second part develops new theoretical tools – most of which inspired from optics – well-suited to describe the propagation of coherent atomic sources. A phase-space approach of the propagation, relying on the evolution of moments, is developped and applied to study the low-energy dynamics of Bose-Einstein condensates. The ABCD method of propagation for atomic waves is extended beyond the linear regime to account perturbatively for mean-field atomic interactions in the atom-optical aberrationless approximation. A treatment of the atom laser extraction enabling one to describe aberrations in the atomic beam, developped in collaboration with the Atom Optics group at Institut d'Optique, is exposed. Last, a quality factor suitable for the characterization of diluted matter waves in a general propagation regime has been proposed.
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https://pastel.archives-ouvertes.fr/tel-00346573
Contributor : Impens François <>
Submitted on : Thursday, December 11, 2008 - 6:07:34 PM
Last modification on : Wednesday, September 23, 2020 - 4:39:01 AM
Long-term archiving on: : Tuesday, June 8, 2010 - 4:41:51 PM

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  • HAL Id : tel-00346573, version 1

Citation

François Impens. Contribution à l'optique des ondes atomiques cohérentes - Conception de dispositifs multi-ondes. Physique Atomique [physics.atom-ph]. Ecole Polytechnique X, 2008. Français. ⟨tel-00346573⟩

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