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Conception et réalisation d'un gravimètre à atomes froids

Abstract : We present the realisation of a matter wave interferometer which measures the acceleration
of gravity. The wave-packets of 87Rb atoms are manipulated with two counter-propagating
laser inducing stimulated Raman transitions. These transitions are used to create an interferometer
and the interferometric phase difference depends on the acceleration of the atoms in the laboratory's
referential. When the Raman lasers are applied vertically, the interferometer is sensitive to the Earth
acceleration g. In the context of the watt balance experiment, realised at LNE, the knowledge of the
Earth acceleration is required with an uncertainty of g/g = 10−9. The goal of our gravimeter is to
obtain a sensitivity of 10−9g in less than one minute of integration, and an accuracy better than 10−9g.
A particular care was brought to conceive a compact experimental set-up so that it could be moved. It
will then be placed close to the balance or in different measure sites to compare it with other absolute
gravimeters. We have reached a sensitivity of 7 × 10−8g.Hz−1/2, enabling to get a statistical uncertainty
of 3 × 10−9g after 1000 seconds of integration. A first analysis of the noise sources enabled us
to identify the improvements required on the set-up and in particular those concerning the vibrations
which currently limit the short term sensitivity.
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Contributor : Patrick Cheinet Connect in order to contact the contributor
Submitted on : Monday, May 22, 2006 - 9:53:38 AM
Last modification on : Wednesday, November 17, 2021 - 12:30:16 PM
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  • HAL Id : tel-00070861, version 1


P. Cheinet. Conception et réalisation d'un gravimètre à atomes froids. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2006. Français. ⟨tel-00070861⟩



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