Hannover 2020 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 32: Precision Measurements and Metrology (Optical Clocks)
Q 32.4: Vortrag
Mittwoch, 11. März 2020, 14:45–15:00, a310
Progress towards a frequency measurement campaign for magnesium lattice clock — •Nandan Jha, Dominika Fim, Steffen Sauer, Waldemar Friesen-Piepenbrink, Klaus Zipfel, Wolfgang Ertmer, and Ernst Maria Rasel — Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
The 1S0 - 3P0 clock transition of Mg with much lower sensitivity to black body radiation compared to Sr and Yb could be interesting for future room temperature optical clocks. In Hannover, we therefore are working on the development of a bosonic magnesium optical lattice clock. We have previously reported on using a two stage MOT to load 103 atoms into an optical lattice operating at the magic wavelength of 468 nm where the optical lattice potential generated inside an enhancement cavity allows us to perform spectroscopy in the Lamb Dicke regime. In 2017, we performed the first frequency measurement for the 1S0 - 3P0 clock transition in the 10−15 regime. In this contribution, we will discuss our recent spectroscopy measurements with a resolved clock transition linewidth of 7(3) Hz, which allows us to perform self-comparison measurements with a precision in the 10−17 regime. We have therefore been able to determine some of the systematic frequency shift contributions with an uncertainty in the 10−17 regime as well. We will give details on these preliminary measurements for the uncertainty budget as we progress towards our next frequency measurement campaign.