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Improvement of the frequency stability below the dick limit with a continuous atomic fountain clock

Auteur(s)
Devenoges, Laurent 
Institut de physique 
Editeur(s)
Stefanov, A.
Joyet, Alain 
Institut de physique 
Thomann, Pierre 
Institut de physique 
Di Domenico, Gianni 
Institut de physique 
Date de parution
2012
In
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, Institute of Electrical and Electronics Engineers (IEEE), 2012/59/2/211-216
Résumé
The frequency instability of a shot-noise limited atomic fountain clock is inversely proportional to its signal-to- noise ratio. Therefore, increasing the atomic flux is a direct way to improve the stability. Nevertheless, in pulsed operation, the local oscillator noise limits the performance via the Dick effect. We experimentally demonstrate here that a continuous atomic fountain allows one to overcome this limitation. In this work, we take advantage of two-laser optical pumping on a cold cesium beam to increase the useful fountain flux and, thus, to reduce the frequency instability below the Dick limit. A stabil- ity of 6 • 10<sup>-14<sub> τ</sub>-1/2</sup> has been measured with the continuous cesium fountain FOCS-2.
URI
https://libra.unine.ch/handle/123456789/10125
DOI
10.1109/TUFFC.2012.2181
Autre version
http://dx.doi.org/10.1109/TUFFC.2012.2181
Type de publication
Resource Types::text::journal::journal article
Dossier(s) à télécharger
 main article: Devenoges_Laurent_-_Improvement_of_the_Frequency_Stability_20120529.pdf (490.87 KB)
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