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Etude d'un gravimètre à atomes froids embarquable

Abstract : Atom interferometry is a very ecient technique to achieve both highly sensitive and absolute inertial sensors. An onboard gravimeter exploiting both advantages would be very helpful in many applications, such as geology, oil prospection or navigation... Unfortunately, state-of-the-art laser cooling techniques are too sensitive to environmental disturbances. This thesis aims at developing robust solutions allowing for a cold atom gravimeter to be operational in onboard conditions.
Firstly, a prospective evaluation of the performances of the onboard instrument was performed. It led to the design of our prototype. Secondly, an optical bench for Rubidium cooling was built up : fibered Telecom lasers at 1560 nm were used, and second harmonic generation was achieved with Periodically Poled Lithium Niobate (PPLN). The whole system was installed in an electronic rack cabinet, and magneto-optical trapping was obtained, even in presence of mechanical vibrations and strong thermal variations (from 10 to 25°C in 30 min). Finally, Raman beams were synthesized with a 1560 nm electro-optic modulator, and preliminary tests were performed on cold atomic clouds.
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Submitted on : Thursday, November 1, 2007 - 11:52:56 AM
Last modification on : Tuesday, March 16, 2021 - 3:44:42 PM
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  • HAL Id : tel-00184758, version 1



Fabien Lienhart. Etude d'un gravimètre à atomes froids embarquable. Physique Atomique [physics.atom-ph]. Observatoire de Paris, 2007. Français. ⟨tel-00184758⟩



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