Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 71: Precision Measurements and Metrology (Optical Clocks) (joint session Q/A)

Q 71.2: Vortrag

Freitag, 9. März 2018, 10:45–11:00, K 2.013

²⁴Mg optical lattice clock — •Nandan Jha, Dominika Fim, Klaus Zipfel, Steffen Rühmann, Steffen Sauer, Waldemar Friesen-Piepenbrink, Wolfgang Ertmer, and Ernst Rasel — Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany

Magnesium is a promising candidate for an optical lattice clock due to its low black body radiation sensitivity. In our previous measurements, the tunneling induced broadening for the bosonic ²⁴Mg in shallow lattices had limited the linewidth of the clock transition to kHz scale [1]. We have improved upon these measurements by increasing the intra-cavity optical lattice power to perform spectroscopy in a 50   E_r deep lattice. Reduced tunneling along with improved detection efficiency further allowed us to operate at lower excitation fields to achieve a linewidth below 50 Hz. With the reduced linewidth, we have performed our first systematic shift measurements with an overall error budget in the 10⁻¹⁵ regime. The fiber link setup by the group of G. Grosche between IQ, Hannover and PTB, Braunschweig [2] allowed us to compare the Mg lattice clock against the frequency references at PTB. In this contribution, we discuss our systematic shift measurements, as well as our efforts towards further improving the line-Q factor of the clock transition.

[1] A. Kulosa et al., Phys. Rev. Lett. 115, 240801 (2015).

[2] G. Grosche, Opt. Lett. 39, 2545 (2014).