| Zugriffsnummer | 11036 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Cold Sr atoms for an optical frequency standard [poster] |
| Autor(in); Institution |
Pottie, Paul-Eric; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Binnewies, Tomas; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Stoehr, Hardo; Universität Hannover, Institut für Quantenoptik, Hannover, GERMANY
Sterr, Uwe; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Helmcke, Jürgen; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Riehle, Fritz; 4, Optik, PTB-Braunschweig
|
| Quelle/Jahr | 18th European Frequency and Time Forum (EFTF 2004), 5 - 7 April 2004, University of Surrey, Guildford, UK:(2004), 426 |
| Schriftenreihe | Conference publication / Institution of Electrical Engineers: 499 |
| Herausgeber(in) |
Institution of Electrical Engineers
|
| ISBN | 0-86341-384-6 |
| Verlag | London: IEE |
| Konferenzangaben | 18th European Time and Frequency Forum (EFTF), Guildford, 05-07, April, 2004, United Kingdom |
| Zusammenfassung | Sr-atoms are of special interest for an optical frequency standard since a large number of atoms can be cooled down efficiently to utra-low temperatures in a magneto-optical trap (MOT). The ultra-narrow line on the forbidden 1S0 → 3P0 transition of 87Sr (3P0 natural lifetime is approx. 100 s), and the ability to interrogate Sr atoms in a perturbation free dipole trap promise un-precedented low inaccuracy level and relative frequency instability, well below 10-15 τ1/2. We will show the realization of an efficient atomic source of cold Sr atoms and the construction of an ultra-stable laser for the interrogation of the atoms. The spectral density of noise of the laser of interrogation and its spectral aliasing in the Fourier space by the Dick effect is a key parameter for the frequency instability of the future frequency standard. Our ultra-stable laser for the Ca-frequency standard exhibits a line-width (FWHM) smaller than 1.5 Hz, with a linear drift of 0.2 Hz/s, and a relative frequency instability of 3 · 10-15 from 0.4 s to a few seconds. To reach the frequency instability that would be possible with long interaction times in a dipole trap, especially the low frequency fluctuations of the interrogation laser to a broaden atomic line. We will discuss possible schemes to realize such a stabilization. For this pre-stabilization it is essential to get as many cold atoms as possible in a time as short as possible. Our experimental set-up is optimized for that purpose. Sr atoms are first showed in a Zeeman slower, then deflected with the help of a 2-D molasses, and trapped in a MOT. We will present the parameters of our MOT and its implication on an optical frequency standard. |
