Volume 36, Number 1, October 1996
|Page(s)||25 - 30|
|Section||Atomic, molecular and optical physics|
|Published online||01 September 2002|
An experimental study of the spin-exchange frequency shift in a laser-cooled cesium fountain frequency standard
LPTF/BNM - 61 Avenue de l'Observatoire, Paris 75014, France
2 NPL - Teddington, Middlesex TW11 0LW, UK
Accepted: 14 August 1996
The spin-exchange frequency shift due to cold collisions between ground-state atoms appears to be the systematic effect which could limit the accuracy of a laser-cooled cesium fountain operating as a frequency standard. We have investigated this shift for atoms distributed among all the Zeeman substates of either the F=4 or F=3 hyperfine level of the ground state of cesium and for the case where most of the atoms are prepared in F=3, MF=0 sublevel. The measured relative frequency shifts are respectively , and . These results agree with the measurements performed by Gibble and Chu at higher atom densities with atoms prepared in F=3, MF=0 sublevel. However, the precision of our frequency measurements is much better and is only limited at by the H-maser used as a reference oscillator. Finally, we show that the relative frequency shift due to cold collisions can be reduced to 10-15, while preserving a short-term frequency stability of about .
PACS: 32.80.Pj – Optical cooling of atoms; trapping / 34.90.+q – Other topics in atomic and molecular collision processes and interactions / 42.50.Vk – Mechanical effects of light on atoms, molecules, electrons, and ions
© EDP Sciences, 1996
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.