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Réalisation d'un condensat de Bose-Einstein dans un piège dipolaire optique à 1565 nm

Jean-François Clément 1
1 laboratoire Charles Fabry de l'Institut d'Optique / Optique atomique
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : This thesis deals with a new-generation experimental apparatus for producing 87Rb Bose-Einstein condensates. We used an optical-dipole trap at 1565 nm to reach quantum degeneracy. We used this new all-optical approach to produce a Bose-Einstein condensate with an optical-dipole trap generated by a 1565 nm fiber laser. A new in situ imaging method has been achieved, based on light-shift effects induced by a 1565 nm laser light on 87Rb energy levels. This light-shift tomography allows us to map the optical potential created by the optical-dipole trap beams and to monitoring the atomic potential-energy distribution during the free-evaporation process. We implemented a light-shift adapted experimental scheme to load enough atoms in the optical-dipole trap, thanks to our understanding of the light shifts induced by the optical-dipole trap light on the 87Rb atom. Furthermore, we were able to start evaporative cooling in the optical trap, leading to quantum degeneracy. A Bose-Einstein condensate has finally been produced after a nearly 4 s evaporation process. We typically obtained 50 000 atoms at 80 nK at the end of evaporative cooling.
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https://pastel.archives-ouvertes.fr/tel-00343970
Contributor : Jean-François Clément <>
Submitted on : Wednesday, December 3, 2008 - 5:10:47 PM
Last modification on : Wednesday, September 16, 2020 - 5:40:32 PM
Long-term archiving on: : Wednesday, September 22, 2010 - 10:48:32 AM

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  • HAL Id : tel-00343970, version 2

Citation

Jean-François Clément. Réalisation d'un condensat de Bose-Einstein dans un piège dipolaire optique à 1565 nm. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2008. Français. ⟨tel-00343970v2⟩

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