| 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. |
| Citation: |
Optics Express |
| Volume: |
13 |
| Issue: |
4 |
| Pages: |
pp. 1249 - 1253 |
| Keywords: |
high-resolution;micro-optics;spectroscopy |
| Research Areas: |
|
| PDF version: |
 Click here to retrieve PDF version of paper (315KB) |
