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|Author(s):||Svenja A. Knappe; P Schwindt; V Shah; Leo W. Hollberg; John E. Kitching; Li-Anne Liew; John Moreland;|
|Title:||A chip-scale atomic clock based on 87Rb with improved frequency stability|
|Published:||February 21, 2005|
|Abstract:||We demonstrate a microfabricated atomic clock physics package based on coherent population trapping (CPT) of 87Rb atoms. The package occupies a volume of 12 mm3 and requires 195 mW of power to operate. Compared to a previous microfabricated clock exciting the D2 transition in Cs, this 87Rb clock shows significantly improved short- and long-term stability. The instability at short times is 4 × 10-11 / τ1/2 and the improvement over the Cs device is mainly due to an increase in resonance amplitude. At longer times (τ > 50 sec), the improvement results from the reduction of a slow drift to –5 × 10-9 / day. The drift is most likely caused by a chemical reaction of nitrogen and barium inside the cell. When probing the atoms on the D1 line, spin-exchange collisions between Rb atoms and optical pumping have increased importance.|
|Pages:||pp. 1249 - 1253|
|PDF version:||Click here to retrieve PDF version of paper (322KB)|