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Atomes piégés et refroidis par laser à quelques microkelvins: un piège magnéto-optique dans une cellule de césium et quelques applications

Abstract : Laser cooled and trapped atoms are the subject of this thesis : we built and studied a magneto-optical trap in a glass cell with a low pressure cesium vapor. The filling of the trap is described by a Monte-Carlo simulation on a F=0 / F'=1 transition. But a more detailed understanding of the behaviour of the trap requires that one takes into account the structure of the ground level of the transition, the new laser cooling mechanisms and density effects such as the ones originating in multiphoton scattering. In this very deep trap (the depth is up to a few Kelvin), high densities of atoms (10^10 to 10^12 atoms per cm^3), at a low temperature (5 to 100μK) are obtained. We also present a first experiment of non-linear optics on this cold sample of atoms : we observed Raman transitions between the light-shifted Zeeman sublevels of the ground state. Finally, we discuss a few possible applications of the magneto-optical trap.
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Submitted on : Thursday, March 9, 2006 - 1:03:47 PM
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  • HAL Id : tel-00011883, version 1

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Delphine Grison. Atomes piégés et refroidis par laser à quelques microkelvins: un piège magnéto-optique dans une cellule de césium et quelques applications. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 1992. Français. ⟨tel-00011883⟩

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