Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 11: Precision Measurements and Metrology: Optical Clocks (with Q)
A 11.6: Talk
Monday, March 6, 2017, 18:15–18:30, P 104
Evaluation of a magnesium frequency standard and progress towards a frequency measurement — •Klaus Zipfel, Dominika Fim, Nandan Jha, Steffen Rühmann, Steffen Sauer, Waldemar Friesen, Pia Koopmann, Wolfgang Ertmer, and Ernst Rasel — Institut für Quantenoptik, Leibniz Universität Hannover, Deutschland
State-of-the-art optical atomic lattice clocks with fermionic strontium already reached uncertainties in the low 10−18 regime [1,2]. In order to operate on that level, a high Q factor and hence a narrow observable linewidth of the clock transition is key for the evaluation of the systematics.
In this presentation, we report on spectroscopy with an observable linewidth of 100 Hz for the 1S0 - 3P0 clock transition in bosonic magnesium, which corresponds to the highest Q factor for an optical transition in that species so far. As a consequence, the resolution for evaluating the uncertainties like 2nd order Zeeman and lattice AC-Stark shift increases. We will show the latest results for our systematics and as well present the progress towards an absolute frequency measurement.
[1] B. J. Bloom et al., Nature 506, 71 - 75 (2014)
[2] T.L. Nicholson et al., Nature Communications 6, 6896 (2015)