Interférométrie atomique embarquée double espèce, 87Rb et 39K, appliqué au test du principe d'équivalence faible et à la navigation inertielle

Abstract : This thesis is at the boundary of the fundamental physics with the test of the weak equivalence principle (WEP) and the transfer of the technologies developed to industrial applications such inertial navigation. We began collaboration in a joint laboratory (iXAtom) with the iXBlue company where we worked on the hybridization of an inertial unit with a cold atom accelerometer.In order to test the WEP, we use a dual-species atom interferometer (87Rb and 39K). This experiment works in the laboratory but it is designed to perform onboard the Novespace ZERO-G plane. This specificity puts constraints on the design of the setup because it needs to be robust, compact and transportable. Our laser system is a good example because it is based on Telecom technologies (1560 and 1534 nm) frequency doubled. We realized the first test of the weak equivalence principle on microgravity with cold atoms in 2015, which is a major step toward a future spatial mission.The 39K is an atomic species hard to cool and manipulate because of its narrow hyperfine structure. We implemented an other cooling method, the gray molasses, by using a laser resonant to the potassium D1 transition. We built a new sequence to prepare the atoms in the mF= 0 state. This sequence is effective at 95%. These techniques improved the contrast of our interference fringes by a factor 4 which led to the obtention of a sensitivity on the Eötvös parameter in the laboratory of 5.2x10-8 after 11500 s of integration.
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Laure Chichet. Interférométrie atomique embarquée double espèce, 87Rb et 39K, appliqué au test du principe d'équivalence faible et à la navigation inertielle. Autre. Université de Bordeaux, 2017. Français. ⟨NNT : 2017BORD0865⟩. ⟨tel-01717235⟩

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