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Fonctionnements continu et entrelacé d'un gyromètre à atomes froids et amélioration de sa stabilité

Abstract : Sagnac atomic gyroscopes have great potential due to their high sensitivity to rotation. The SYRTE atomic gyroscope uses laser cooled cesium atoms. Thank to stimulated Raman transitions, we form a folded Mach-Zehnder type interferometer. The instrument allows interrogation times up to 800~ms, which corresponds to a 11cm² Sagnac area, the largest demonstrated for atom interferometers. This is a major step toward the use of such instruments in inertial navigation. I describe the methods implemented to push the short-term sensitivity and performed the first detailed study of systematics, such as those linked to light-shifts due to the preparation and the detection of the atoms and those linked to misalignment of parallelism of the mirrors and of the trajectories of the atoms. I demonstrated a short-term stability of 30nrad.s⁻¹.Hz^{-1/2} in triple interleaved joint interrogation which improves the state of the art by a factor 3. The state of the art has also been improved by a factor 5 in long-term with a 0,2nrad.s⁻¹ stability in 30 000s.
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Denis Savoie. Fonctionnements continu et entrelacé d'un gyromètre à atomes froids et amélioration de sa stabilité. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066585⟩. ⟨tel-01919499⟩

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