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Theses

Atomes froids dans des réseaux optiques - Quelques facettes surprenantes d'un système modèle

Abstract : This thesis is devoted to the experimental study of atoms trapped and cooled in several types of optical structures. In order to characterise these media, we used different techniques such as time-of-flight techniques, direct imaging of the atomic
cloud and pump-probe spectroscopy. We thus obtained information about kinetic temperature, spatial diffusion of atoms and atomic motion in the optical potential wells.

We first studied the dynamics of cesium atoms in three-dimensional bright optical lattices when a magnetic field is applied. In particular, we showed that optical lattices operating in the jumping regime do provide good trapping and cooling efficiencies and that a motionnal narrowing effect gives birth to narrow
vibrational sidebands on pump-probe transmission spectra. Still with cesium atoms, we created and characterised a three-dimensional bright optical lattice obtained with only two laser beams through the Talbot effect, and also a random medium
generated by a speckle field.

We endly studied a ``brownian motor'' for $^(87)$Rb atoms in a grey asymmetric potential. The results of the experimental study are in good qualitative agreement with semi-classical Monte-Carlo numerical simulations.
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https://tel.archives-ouvertes.fr/tel-00006734
Contributor : Cécile Robilliard <>
Submitted on : Tuesday, August 24, 2004 - 12:26:07 PM
Last modification on : Thursday, October 29, 2020 - 3:01:24 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:27:16 PM

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  • HAL Id : tel-00006734, version 1

Citation

Cécile Mennerat-Robilliard. Atomes froids dans des réseaux optiques - Quelques facettes surprenantes d'un système modèle. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 1999. Français. ⟨tel-00006734⟩

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