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Développement d'un gradio-gravimètre à atomes froids et d'un système laser télécom doublé pour applications embarquées

Abstract : This thesis presents the development of the experimental setup allowing the measurement of two gravity gradient components, Γzz and Γzx, and the gravity acceleration. These quantities are resulted from the measuring of rubidium cold atoms acceleration, in free fall in vacuum, by atom interferometry. For gradiometry, the differential measurement is realized between two atomic clouds spatially separated. For the measurement of Γzz, the use of mobile optical lattices allows to get two atom clouds from a single atomic source. This work presents the setting up of the complete device, in particular with the built of the vaccum chamber, laser and micro-wave systems. Lasers are based on frequency-doubled telecom technology, which allows to obtain compact and robust systems, dedicated for onboard applications. The innovative laser architecture allows to combine atom interferometry and optical lattices, while minimizing the amount of components. The laser noise has been characterized, and limits the single shot gravimetric sensitivity to 10-9 g, the single shot differential sensitivity to 10-10 g, and the single shot gradiometric sensitivity to 38 E.
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Fabien Theron. Développement d'un gradio-gravimètre à atomes froids et d'un système laser télécom doublé pour applications embarquées. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2015. Français. ⟨NNT : 2015PA066479⟩. ⟨tel-01296943⟩

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