Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 10: Precision Measurements and Metrology III (with Q)
A 10.2: Vortrag
Montag, 29. Februar 2016, 17:15–17:30, a310
The magnesium optical lattice clock at the IQ — •Dominika Fim, Steffen Rühmann, Klaus Zipfel, Nandan Jha, Steffen Sauer, André Kulosa, Wolfgang Ertmer, and Ernst M. Rasel — Leibniz Universität Hannover, Institut für Quantenoptik, Hannover
Optical lattice clocks based on fermionic strontium already reached uncertainties in the low 10−18 regime and are studied among others by JILA and NIST. In Hannover at the IQ, we operate an optical lattice clock based on bosonic magnesium atoms. Magnesium has a relatively simple electronic structure and hence allows for the implementation of very precise atomic structure models.
Recent measurements of the magic wavelength, which we could determine to 468.48(21) nm, and the 2nd order Zeeman shift were limited due to tunneling effects which results in a 10 kHz broad clock transition linewidth. In this presentation we will give a status update, where we will report on the optical lattice with a reduced tunneling rate and in this context more accurate measurements on the magic wavelength and the 2nd order Zeeman shift. We also prepare the optical lattice clock for a frequency measurement and will give the first estimations for the frequency accuracy for our apparatus.