Erlangen 2022 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 24: Precision spectroscopy of atoms and ions III (joint session A/Q)
A 24.4: Vortrag
Donnerstag, 17. März 2022, 11:30–11:45, A-H3
Investigation of frequency shifts induced by thermal radiation for an 88Sr+ optical clock — •Martin Steinel1, Hu Shao1, Thomas Lindvall2, Melina Filzinger1, Richard Lange1, Burghard Lipphardt1, Tanja Mehlstäubler1, 3, Ekkehard Peik1, and Nils Huntemann1 — 1Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — 2VTT Technical Research Centre of Finland, National Metrology Institute VTT MIKES, P.O. Box 1000, 02044 VTT, Finland — 3Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
To realize transition frequencies in optical clocks with high accuracy, a careful investigation of all frequency shifts is required. For most systems operated at room temperature, the AC Stark shift induced by thermal radiation is important. It shows a T4-dependence, and is proportional to the differential polarizability of the states. For an ion in a radiofrequency (rf) trap, it is challenging to determine the effective temperature T of blackbody radiation, if the trap assembly is heated by rf-losses. Temperature sensors and infrared cameras can be employed to determine T from FEM simulations. Because of the low thermal conductivity of our trap assembly, we expect large uncertainties from such investigations. Thus, we determine the frequency shift from thermal radiation by measuring the clock transition frequency of a single 88Sr+ ion at three different trap drive powers using our 171Yb+ clock as the reference. Using the known polarizability of 88Sr+, we find a temperature uncertainty of only 4 K and determine the ratio of the unperturbed transition frequencies with 6 × 10−17 fractional uncertainty.