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Theses

Vers un accéléromètre atomique sur puce

Abstract : In this manuscript we report the theoretical and experimental developments, in progress at TRT, aiming at the realisation of a cold atom accelerometer. This accelerometer uses an ultra-cold non-degenerated gas which is trapped in the vicinity of an atom chip during the whole interrogation sequence. We describe an interrogation protocol allowing the sensor to be sensitive to acceleration. This protocol uses a Ramsey sequence with a spatial separation of the two interferometer states. The signal and the contrast of this interferometer are derived and the use of shortcut to adiabadicity is considered to enable fast splitting and merging of the two states. We also describe a design of the accelerometer on an atom chip. This design use two dressed microwave potentials, one for each of the two interferometer states. We described the atom cooling experiment built during this thesis. Atoms of rubidium 87 have been cooled to Bose-Einstein condensation in state |2,2〉. A stimulated Raman adiabatic passage protocol using microwave fields, allows to transfer an atomic cloud (condensed or thermal) to the state |2,1〉. With this atomic source the contrast of the Ramsey fringes as a function of the symmetry between the interferometer traps have been measured. The measured contrast falling time is in good agreement with the theoretical prediction for the interferometer contrast.
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https://pastel.archives-ouvertes.fr/tel-01366681
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Submitted on : Thursday, September 15, 2016 - 10:47:10 AM
Last modification on : Sunday, October 18, 2020 - 4:13:39 PM
Long-term archiving on: : Friday, December 16, 2016 - 1:37:22 PM

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  • HAL Id : tel-01366681, version 1

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Matthieu Dupont-Nivet. Vers un accéléromètre atomique sur puce. Optique [physics.optics]. Université Paris Saclay (COmUE), 2016. Français. ⟨NNT : 2016SACLO007⟩. ⟨tel-01366681⟩

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