Improvement of the fractional uncertainty of a neutral-atom calcium optical frequency standard to 2�10 -14
| Autor: | Uwe Sterr, G. Wilpers, A. Chernyshov, Jürgen Helmcke, T. Binnewies, Fritz Riehle, C. Degenhardt |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Physics
Quantum optics Atom interferometer Physics and Astronomy (miscellaneous) Energetic neutral atom business.industry General Engineering General Physics and Astronomy Residual Atomic clock Computational physics symbols.namesake Optics Ultracold atom symbols Physics::Atomic Physics business Doppler effect Order of magnitude |
| Zdroj: | Applied Physics B: Lasers and Optics. 76:149-156 |
| ISSN: | 1432-0649 0946-2171 |
| DOI: | 10.1007/s00340-003-1109-7 |
| Popis: | We have investigated the two major effects that limit the accuracy of an optical frequency standard based on laser-cooled neutral calcium atoms, i.e. the residual Doppler shift and atomic collisions. A new correction method was applied to reduce the contribution of the residual Doppler effect to the total fractional uncertainty to 1×10-14. Measurements of the shift of the clock transition frequency due to cold collisions allowed us to reduce their contribution to 4×10-15. With these improvements we have reduced the total fractional frequency uncertainty of the standard by nearly an order of magnitude to 2×10-14. |
| Databáze: | OpenAIRE |
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