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Theses

Condensat de Bose-Einstein de sodium dans un piège mésoscopique

Abstract : In this Thesis, we report on the theoretical background as well as the building and the first results of a novel experiment which was started along with this work. We demonstrate the production of a Bose-Einstein condensate of sodium confined in a tightly focused optical trap. We present original results on the ground state and the excitations of a condensate confined in a gaussian trap with a single bound state, and show how to use interactions between spin states to form highly correlated quantum states. We detail the optimization of the conversion efficiency of a sum frequency generation process in a doubly resonant optical cavity. This leads to the building of a solid-state laser for the cooling of sodium. Out of two commercially available infrared lasers, we produce up to 800 mW at 589 nm, with near-unit conversion efficiency. This yellow laser is used to form a magneto-optical trap (MOT) of sodium. It is loaded efficiently using light-induced atomic desorption, while the background pressure in the vacuum chamber drops back down in less than 100 ms afterwards. The transfer of the atoms from the MOT to a crossed dipole trap is studied and optimized. The conception and use of a high numerical aperture microscope objective is detailed, allowing for the formation of a tightly focused dipole trap, in which the condensate is obtained after an evaporative cooling phase. This phase is characterized and compared to a numerical simulation.
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https://tel.archives-ouvertes.fr/tel-00527457
Contributor : Emmanuel Mimoun <>
Submitted on : Tuesday, October 19, 2010 - 12:51:32 PM
Last modification on : Thursday, December 10, 2020 - 12:39:00 PM
Long-term archiving on: : Friday, October 26, 2012 - 11:40:44 AM

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  • HAL Id : tel-00527457, version 1

Citation

Emmanuel Mimoun. Condensat de Bose-Einstein de sodium dans un piège mésoscopique. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2010. Français. ⟨tel-00527457⟩

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