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Optimisation d’un capteur inertiel à atomes froids par une nouvelle technique de mesure accélérométrique combinant interférométrie atomique et oscillations de Bloch

Abstract : This work has shown the feasibility of measuring the gravity by atom interferometry, combining atomic Bloch oscillations and a Ramsey-Bordé interferometer with stimulated Raman transitions. The measurement sensitivity of this kind of instrument increases with the interaction time. As the atoms are in free-fall during this time, classical atomic gravimeters, with three Raman pulses, are limited in sensitivity because of the dimensions of the device used. Bloch oscillations limit the fall of the atoms inside the interferometer, and therefore enable longer interaction times without being limited by the size of the experimental device. They also allow to perform a local measurement of the gravity. This is particularly interesting in order to reduce the size of such an instrument, or to perform short-range interaction measurements. It was possible to measure the gravity, with a resolution of 2.10-7 g for an integration time of 300 s, which is one of the most sensitive measurements performed until now with an atomic gravimeter with Bloch oscillations. The displacement of atoms during the interferometer is reduced to about 1 mm. The limitations of the sensitivity of the measurement appear to be due to imperfections of the laser used to generate the optical lattice performing the Bloch oscillations. These imperfections are mostly speckle, induced by defects in the optical elements, and parasitic reflections on the windows of the vacuum chamber.
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https://tel.archives-ouvertes.fr/tel-01778037
Contributor : Renée Charriere <>
Submitted on : Wednesday, April 25, 2018 - 12:42:35 PM
Last modification on : Friday, June 26, 2020 - 2:04:03 PM
Long-term archiving on: : Thursday, September 20, 2018 - 2:54:10 AM

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Charrière Renée. Optimisation d’un capteur inertiel à atomes froids par une nouvelle technique de mesure accélérométrique combinant interférométrie atomique et oscillations de Bloch. Physique Quantique [quant-ph]. Université Pierre et Marie Curie (Paris 6), 2011. Français. ⟨tel-01778037⟩

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