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Quasicristaux optiques : refroidissement et piégeage d'atomes de césium dans un potentiel lumineux quasi-périodique

Abstract : In this thesis we report the results of an experimental investigation of bright optical lattices. The lattices that we studied cool and trap cesium atoms in quasi-periodic optical potentials. Therefore this thesis involves laser cooling techniques but studies physical systems that share some symmetry properties with solid-state quasicrystals (non-periodic, long-range ordered solid-state materials discovered in 1984).

In particular, we demonstrate the cooling and trapping capabilities of incommensurate optical lattices, optical superlattices and optical quasicrystals (optical lattices with a five-fold rotational symmetry).

In order to study these new physical systems, a wide variety of diagnostics have been used: time of flight, pump-probe spectroscopy, Bragg scattering and direct imaging techniques. We thus obtained information about kinetic temperature, atomic motion at the bottom of the optical potential wells, long range quasi-periodic order and transport properties.

In the last part of the manuscript, we report the results obtained from a three-dimensional semi-classical Monte-Carlo simulation. Even though the atomic transition that we consider is different to the actual transition of cesium atoms, the results are in good qualitative agreement with experimental data. The information obtained from the simulation has been very useful for understanding the atomic behaviour in these complicated new optical structures.
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https://tel.archives-ouvertes.fr/tel-00004625
Contributor : Luca Guidoni <>
Submitted on : Wednesday, February 11, 2004 - 12:02:06 PM
Last modification on : Tuesday, December 15, 2020 - 11:58:02 AM
Long-term archiving on: : Friday, April 2, 2010 - 7:39:53 PM

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  • HAL Id : tel-00004625, version 1

Citation

Luca Guidoni. Quasicristaux optiques : refroidissement et piégeage d'atomes de césium dans un potentiel lumineux quasi-périodique. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 1998. Français. ⟨tel-00004625⟩

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