Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 41: Precision Measurement and Metrology 1
Q 41.3: Talk
Wednesday, March 16, 2011, 17:00–17:15, HÜL 386
Towards an optical frequency standard based on cold neutral magnesium atoms in an optical lattice — •André P. Kulosa, André Pape, Temmo W. Wübbena, Jan Friebe, Matthias Riedmann, Hrishikesh Kelkar, Steffen Rühmann, Dominika Fim, Klaus H. Zipfel, Wolfgang Ertmer, and Ernst-M. Rasel — Leibniz Universität Hannover, Institut für Quantenoptik, Hannover
Optical clocks have exceeded today’s best atomic microwave clocks in accuracy and stability. The alkaline earth atoms are promising candidates for possible future optical frequency standards. Magnesium shows an attractive benefit with its low sensitivity to black body radiation shift at room temperature, which is a limiting contribution to today’s best optical clocks.
Our current magnesium frequency standard is based on cold free-falling atoms interrogated on the narrow intercombination line 1S0 - 3P1 using a Ramsey-Bordé-interferometer geometry.
We trap the bosonic isotope 24Mg in an optical dipole trap at 1064 nm during a MOT-cooling stage in the triplet manifold. We are able to accumulate 105 atoms at a temperature of 100 µK in the dipole trap using a continuous loading scheme. The atoms will be transferred to an optical lattice at the magic wavelength which is predicted to be 463 nm. The power in the lattice is enhanced using a build-up cavity.