Manipulation d'atomes froids dans des potentiels lumineux

Jean-Philippe Brantut 1
1 laboratoire Charles Fabry de l'Institut d'Optique / Optique atomique
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : This thesis presents experiments where Rubidium atoms are manipulated thanks to laser-induced forces. When the laser is far off-resonance, the light-induced force is conservative, and corresponds to light-induced potentials. First, we present an optical dipole trap for Rubidium atoms created by a laser at 1565 nm. In this trap, atoms are cooled by evaporation down to Bose-Einstein condensation. This cooling takes place in the runaway regime, where the density increases with cooling, leading to an improved efficiency. We then present two experiments where a condensate is put into a vertical trampoline. This trampoline is based on an optical lattice created by a vertical standing wave. We study two regimes of this trampoline : in the classical regime, the atoms bounce periodically on the standing wave, while in the quantum regime, atomic matter waves are split in packets that follow separated trajectories, which periodically recombine, leading to interferences. In both regimes the trampoline provides a measurement of gravity. Eventually, we put our condensate in an optical trap that tightly confines atoms in the horizontal plane. The Bose-Einstein condensate is then submitted to a random optical potential created by a laser speckle. We then study the in-plane transport of atoms in the random potential.
Document type :
Theses
Atomic Physics. Paris-Sud XI, 2009. French


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Submitted on : Friday, November 27, 2009 - 11:53:49 AM
Last modification on : Friday, March 27, 2015 - 4:02:23 PM

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Jean-Philippe Brantut. Manipulation d'atomes froids dans des potentiels lumineux. Atomic Physics. Paris-Sud XI, 2009. French. <tel-00436639>

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