Atomic sources for long-time-of-flight interferometric inertial sensors

Gaël Varoquaux 1
1 laboratoire Charles Fabry de l'Institut d'Optique / Optique atomique
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
Abstract : In this thesis, we report on the study of atomic sources for long-time-of-flight inertial sensing, as well as the experimental realization of two of such sources. First, we show that the collimation and coherence properties required by long-interrogation-time can be achieved using degenerate atomic gases and we explicit the relationship between scale factor of the interferometer, and geometry of the interferometer. Then we conduct a feasibility study for atom-interferometric inertial-sensing experiments conducted in a freely-falling airplane. The resulting microgravity opens the door to up to 4 seconds of interrogation time. We detail a protocol for an atom-interferometric test of the equivalence principle during this free fall period. We describe the cold-atom source that we built and tested in microgravity. Finally, the second part of the thesis is devoted to the description of a new experimental setup designed to cool a boson-fermion mixture to quantum degeneracy. We expose and characterize the technologies developed, such as new tunable semiconductor lasers or the compressible optical trap. We present the first results of cold atoms loading in optical tweezers using a fiber laser at 1560nm. We use the large light shift, unique to our system, to develop a new imaging technique, selective in potential energy.
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Submitted on : Friday, March 28, 2008 - 2:05:59 PM
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  • HAL Id : tel-00265714, version 3

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Gaël Varoquaux. Atomic sources for long-time-of-flight interferometric inertial sensors. Atomic Physics [physics.atom-ph]. Université Paris Sud - Paris XI; Institut d'Optique, 2008. English. ⟨tel-00265714v3⟩

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