Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology
Q 16.84: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Determination of the magic wavelength of magnesium — •Birte Lampmann, André Kulosa, Steffen Rühmann, Dominika Fim, Klaus Zipfel, Steffen Sauer, Leonie Theis, Wolfgang Ertmer, and Ernst Rasel — Institut für Quantenoptik, Universität Hannover
Optical clocks with neutral atoms are based on atoms trapped in an optical lattice at the magic wavelength, where the differential AC-Stark shift vanishes. The predicted magic wavelength for magnesium is in the range of 460 − 480 nm. The latest and most accurate calculation estimates 469 nm± 3 nm.
Here we report on the status of the magnesium optical clock experiment. We trap 104 atoms in an optical lattice at the predicted magic wavelength. To remove the hottest atoms from the lattice, the power is ramped down thus only the coldest atoms at approximately 2 µK remain trapped.
We perform spectroscopy of the 1S0 → 3P0 clock transition and by variation of the lattice power and wavelength the magic wavelength can be measured. So far, we narrowed the possible range to be 467.664 nm to 468.957 nm and we will report on the latest results.