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CARACTERISATION D'UN CAPTEUR INERTIEL A ATOMES FROIDS

Abstract : Since recent developments in atom cooling techniques, matter wave applications are numerous. We present the first realization of a rate-gyroscope based on matter-waves associated to cold atoms, in order to reach a high sensitivity and stability. The setup, based on the Sagnac effect, is an atom interferometer where beam splitters and mirrors are realized with lasers pulses inducing stimulated Raman transitions. At the interferometer output, the phase shift between the two arms depends both on accelerations and rotations. We then use two counterpropagating atomic sources in order to discriminate between rotation and acceleration. We tested a new geometry for the laser beams, based on the lasers retroreflection, in order to reduce spurious phase shifts due to wavefront distorsions. The characterization of the first interferometric signal obtained with this setup is presented in this document. Thanks to the implementation of a vibration isolation system, sensitivities obtained after one second are 2,2.10-6 rad.s-1 for rotation et 6,2.10-6 m.s-2 for acceleration. This first characterization revealed the main limitation of the setup, which is presently the number of useful atoms. Further modifications on the experiment will improve this point. A new interferometer was tested, which presents a sensitivity to the rotation axis parallel to the atomic mean direction. This geometry opens possibilities for a new type of rate-gyroscopes, with very high sensitivity and stability.
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https://tel.archives-ouvertes.fr/tel-00007729
Contributor : Florence Leduc <>
Submitted on : Monday, December 13, 2004 - 1:12:26 PM
Last modification on : Wednesday, September 23, 2020 - 4:37:00 AM
Long-term archiving on: : Friday, April 2, 2010 - 8:48:54 PM

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  • HAL Id : tel-00007729, version 1

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Florence Leduc. CARACTERISATION D'UN CAPTEUR INERTIEL A ATOMES FROIDS. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2004. Français. ⟨tel-00007729⟩

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