Frequency stabilization of an atomic clock against variations of the C-field
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United States of America Patent
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Jun 2, 2015
Grant Date -
Dec 19, 2013
app pub date -
Feb 6, 2012
filing date -
Mar 1, 2011
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Abstract
The frequency of an atomic clock may be stabilized against C-field variation by applying a rf magnetic field perpendicular to the C-field to cause a coherent population transfer between Zeeman states that compensates for quadratic frequency shift of transitions of the clock. The cancellation, provided by a feed-forward mechanism, is exact. The invention can be implemented in any atomic clock by including an electrode in the clock generating a magnetic field perpendicular to the C-field, and providing an electronic circuit to send rf signals to the electrode.
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