Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 43: Precision spectroscopy of atoms and ions VI (with Q)
A 43.3: Vortrag
Freitag, 22. März 2013, 11:45–12:00, B 305
Optical Clock with a Generalized Ramsey Scheme — •Nils Huntemann, Burghard Lipphard, Christian Tamm, and Ekkehard Peik — Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
We experimentally investigate a recently proposed optical excitation scheme [1] that is a generalization of Ramsey’s method of separated oscillatory fields. The excitation pulse sequence is tailored to produce a resonance signal that is immune to the light shift and other shifts of the transition frequency that are correlated with the interaction of the atomic system with the probe light field. We investigate the scheme using a single trapped 171Yb+ ion and perform spectroscopy on the highly forbidden 2S1/2−2F7/2 electric-octupole transition that exhibits a strong light shift. This transition serves as a reference in an optical clock, whose accuracy critically depends on the degree of light shift suppression [2]. Our experiments on the new excitation method clearly show a suppression of the light shift by four orders of magnitude and an immunity against its fluctuations [3]. The superior performance of the new technique is demonstrated in a frequency ratio measurement with another optical clock.
V. I. Yudin et al., PRA 82, 011804 (2010)
N. Huntemann et al., PRL 108, 090801 (2012)
N. Huntemann et al., PRL 109, 213002 (2012)