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Piégeage et refroidissement laser du strontium, Etude de l'effet des interférences en diffusion multiple

Abstract : In this thesis we present the realization of a magneto-optical trap of strontium loaded from a laser slowed atomic beam. We have constructed a 200 mW blue laser at 461 nm by frequency doubling an amplified laser diode. Our device has allowed us to trap 10^7 atoms at a temperature of 8 mK.

We have used this cold strontium cloud to study interference effects in multiple scattering. More precisely, we have measured the coherent backscattering cone using light resonant with the J=0 - J=1 transition of strontium. The enhancement factor close to 2 obtained in the polarization channel h // h shows that, as opposed to rubidium, the effect of interferences in multiple scattering, which play a crucial role in strong localization, are not reduced in strontium.

In order to achieve a magneto-optical trap on the narrow transition of strontium we have frequency locked a laser at 689 nm to an ultrastable cavity. We have measured a spectral linewidth below 1 kHz which is sufficient for the experiment. Finally, we present a theoretical study of Doppler cooling on a narrow transition.
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https://tel.archives-ouvertes.fr/tel-00002191
Contributor : Yannick Bidel <>
Submitted on : Friday, January 17, 2003 - 6:50:48 PM
Last modification on : Friday, October 23, 2020 - 4:37:13 PM
Long-term archiving on: : Friday, April 2, 2010 - 6:26:30 PM

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Yannick Bidel. Piégeage et refroidissement laser du strontium, Etude de l'effet des interférences en diffusion multiple. Physique Atomique [physics.atom-ph]. Université Nice Sophia Antipolis, 2002. Français. ⟨tel-00002191⟩

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