Düsseldorf 2007 – scientific programme
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A: Fachverband Atomphysik
A 21: Innovative Traps and Cooling Schemes (jointly with Q)
A 21.2: Talk
Thursday, March 22, 2007, 14:15–14:30, 5D
Ultra-cold strontium atoms for optical frequency metrology — •Joseph Sundar Raaj Vellore Winfred, Thomas Legero, Fritz Riehle, and Uwe Sterr — Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
Precise measurement of time is of paramount importance in technological and scientific endeavors. Recent advancement in optical frequency metrology promises to measure time with a fractional accuracy of 10−17. Strontium is an attractive candidate for such an optical clock because of its narrow line transition with a linewidth of about 1 mHz and the existence of a magic wavelength for the clock transition in the NIR region. Here we report preliminary results of cooling and trapping of strontium atoms. The strontium atoms are cooled down to ultra-cold temperature regime(2 µK) in a two-stage cooling process. An overview of our experimental set up, characterization of a 1-D optical dipole trap with respect to different trap parameters and its relevance to frequency measurement will be presented.