Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 14: Precision Measurements and Metrology (Optical Clocks)
Q 14.3: Vortrag
Montag, 11. März 2019, 14:45–15:00, S SR 111 Maschb.
A Magnesium based optical lattice clock with Hz linewidth — •Waldemar Friesen-Piepenbrink, Dominika Fim, Klaus Zipfel, Nandan Jha, Steffen Sauer, Steffen Rühmann, Wolfgang Ertmer, and Ernst Maria Rasel — Institut für Quantenoptik, Leibniz Universität Hannover
We report on an optical lattice clock utilizing the strongly forbidden 1S0 → 3P0 transition where we perform spectroscopy of 103 precooled 24Mg atoms in an optical lattice at the magic wavelength λm. Concerning its low sensitivity to black body radiation, Magnesium is a favorable species for an optical frequency standard.
Due to the low mass and the low λm of Magnesium a high trap depth is necessary to substantially suppress tunneling between adjacent lattice sites and therefore reduce the tunneling induced broadening of the clock transition. Recent improvements in our lattice setup enabled us to go to trap depths up to 60 Erecoil which resulted in a resolvable linewidth below 10 Hz. Therefore a characterization of the narrow clock transition with a reduced uncertainty was performed to improve stability as well as accuracy of the Magnesium lattice clock.