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Q: Fachverband Quantenoptik und Photonik
Q 61: Matter Wave Interferometry and Metrology III
Q 61.2: Vortrag
Donnerstag, 5. März 2026, 14:45–15:00, P 11
A compact, highly stable dual-laser system for quantum logic spectroscopy of 27Al+ — •Gayatri R. Sasidharan1,2, Sofia Herbers1, Constantin Nauk1,2, Joost Hinrichs1,2, Fabian Dawel1, Benjamin Kraus1, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz Universität Hannover, Institut für Quantenoptik, 30167 Hannover, Germany
Optical clocks using trapped 27Al+ reach a fractional frequency uncertainty below 10−18 [1]. For coherent manipulation of trapped ions, lasers with long coherence time and narrow linewidth are needed. The best stationary laser systems reach an instability of 4 x10−17 [2] and transportable systems 1.6 x 10−16 [3]. This is achieved by stabilizing the laser frequency to a optical cavity. A dual wavelength coated optical cavity is a practical solution addressing space limitations in transportable setups. In this talk, we present a compact, highly-stable dual-laser system for quantum logic spectroscopy. The 729 nm and 1068 nm transitions on 27Ca+ and 27Al+, respectively, are needed to perform quantum logic spectroscopy on the clock ion 27Al+. We report on photothermal and vibrational noise affecting the instability of the cavity. This work shows that a dual wavelength coating can be used for highly stable laser applications making it viable tool for precision spectroscopy experiments.
[1] Marshall, et al., PRL 135, 033201 (2025)
[2] D. G. Matei, et al., PRL 118, 263202 (2017)
[3] S. Herbers, Opt. Lett., OL 47, 5441-5444 (2022)
Keywords: Optical clocks; laser frequency stability