| Zugriffsnummer | 15938 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | Optical frequency standard based on cold Ca atoms |
| Autor(in); Institution |
Helmcke, Jürgen; 4.3, Länge und Zeit, PTB-Braunschweig
Wilpers, Guido; 4.31, Längeneinheit, PTB-Braunschweig
Binnewies, Tomas; 4.301, Quantenoptik mit ultrakalten Atomen, PTB-Braunschweig
Degenhardt, Carsten; 4.31, Längeneinheit, PTB-Braunschweig
Sterr, Uwe; 4.301, Quantenoptik mit ultrakalten Atomen, PTB-Braunschweig
Schnatz, Harald; 4.31, Längeneinheit, PTB-Braunschweig
Riehle, Fritz; 4, Optik, PTB-Braunschweig
|
| Quelle/Jahr | IEEE Transactions on Instrumentation and Measurement: 52 (2003), 2, 250 - 254 |
| ISSN | 0018-9456 |
| Verlag | New York, NY: IEEE |
| Konferenzangaben | Conference on Precision Electromagnetic Measurements ; CPEM 2002, Ottawa, 16-21, June, 2002, Canada |
| Zusammenfassung | A precision optical frequency standard (λ=657 nm) based on cold neutral Ca atoms released from a magneto-optical trap (MOT) has been realized. Systematic contributions to the uncertainty resulting from the residual velocity of the atoms and the acceleration in the gravitational field are determined and reduced by using a combination of different interferometers. With the uncertainty for the effect of cold collisions reduced and an AC stark shift eliminated, the fractional uncertainty in the measured frequency of the Ca clock is reduced to 2 x 10-14. The application of a novel method for producing ultracold atoms showed in first atom interferometric measurements the potential to further reduce the uncertainty to below 10-15. |
