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Communication Dans Un Congrès Année : 2005

Advances in 133Cs Fountains: Control of the Cold Collision Shift and Observation of Feshbach Resonances

Résumé

This paper describes the work performed at BNM-SYRTE (Observatoire de Paris) over the past few years toward the improvement and the use of microwave frequency standards using laser-cooled atoms. First, recent improvements of the 133Cs and 87Rb atomic fountains are described. An important advance is the achievement of a fractional frequency instability of 1.6 × 10-14tau-1/2 where tau is the measurement time in seconds, thanks to the routine use of a cryogenic sapphire oscillator as an ultra-stable local frequency reference. The second advance is a powerful method to control the frequency shift due to cold collisions. These two advances lead to a frequency stability of 2 × 10-16 at 50 000 s for the first time for primary standards. In addition, these clocks realize the SI second with an accuracy of 7 × 10-16, one order of magnitude below that of uncooled devices.
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Dates et versions

hal-03734095 , version 1 (21-07-2022)

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Sébastien Bize, Harold Marion, Luigi Cacciapuoti, Céline Vian, Peter Rosenbusch, et al.. Advances in 133Cs Fountains: Control of the Cold Collision Shift and Observation of Feshbach Resonances. ATOMIC PHYSICS 19: XIX International Conference on Atomic Physics, Jul 2004, Rio de Janeiro (Brazil), Brazil. pp.93-102, ⟨10.1063/1.1928844⟩. ⟨hal-03734095⟩
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