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Spectroscopy and evaporative cooling of rubidium atoms in radiofrequency dressed traps

Abstract : In this thesis, I describe the spectroscopic investigations and preliminary results of evaporative cooling of rubidium atoms done on a magnetic trap dressed with a radiofrequency field. Unlike the case of a static magnetic trap, where a single radiofrequency photon is used to outcouple atoms we have demonstrated that a multiphoton transition is necessary. This transitions are nearly resonant with the energy spacing of the radiofrequency dressed states. The evaporation efficiency is not the same for all the observed transitions: the transition involving a two photon process is more efficient compared to the others. Preliminary results of evaporative cooling in a radiofrequency dressed trap are discussed. The quantum degeneracy is not reached as it is difficult to reach thermalization due to the strong anisotropy in the trap. A way to render the evaporative cooling more efficient is
to increase the horizontal oscillation frequencies. Finally, we discuss a method to load the atoms into a radiofrequency dressed quadrupole trap, leading to large oscillation frequencies in the horizontal directions.
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https://tel.archives-ouvertes.fr/tel-00376470
Contributor : Raghavan Kollengode Easwaran <>
Submitted on : Friday, April 17, 2009 - 3:41:54 PM
Last modification on : Saturday, February 15, 2020 - 1:56:44 AM
Long-term archiving on: : Thursday, June 10, 2010 - 8:53:01 PM

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  • HAL Id : tel-00376470, version 1

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Raghavan Kollengode Easwaran. Spectroscopy and evaporative cooling of rubidium atoms in radiofrequency dressed traps. Atomic Physics [physics.atom-ph]. Université Paris-Nord - Paris XIII, 2009. English. ⟨tel-00376470⟩

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