Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Poster Session - Atomic Physics II
A 14.17: Poster
Dienstag, 10. März 2020, 16:00–18:00, Empore Lichthof
Current status of the Al+ ion clock at PTB — •Fabian Dawel1,2, Johannes Kramer1,2, Nils Scharnhorst1,2, Ludwig Krinner1,2, Lennart Pelzer1,2, Stephan Hannig1,2, Kai Dietze1,2, Nicolas Spethmann1, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, D — 2Leibnitz-Universtität-Hannover, 30167 Hannover, D
Here we present the status of the 27Al+ clock at PTB. The Al+ ion optical clock has one of the lowest systematic uncertainties [1]. This is due to its very low sensitivity to external fields. Al+ exhibits only nuclear linear Zeeman shifts and a very small black body radiation shift which is estimated to be less than 10−19 in our trap setup. The Al+ is co-trapped with 40Ca+ in a linear Paul trap. The Ca+ ion is used for cooling and quantum logic spectroscopy (QLS) of the Al. For QLS groundstate cooling is needed and achived by DEIT which results in a fractional second order Doppler shift from residual motion of the Al+/Ca+ crystal of well below 10−18 [2]. We present coherent excitation of the 1S0 to 3P1 transition of Al+ with a contrast of around 90%. We also present a scheme for phase-stabilising the clock laser light paths from the IR-laser to the ion to achieve long probe times on the clock transition 1S0 to 3P0 at 267 nm.
[1]*Brewer et al. Phys. Rev. Lett. 123, 033201 (2019)
[2]*Scharnhorst et al., Phys. Rev. A 98, 023424 (2018)