Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster VII
Q 56.32: Poster
Thursday, March 14, 2024, 17:00–19:00, KG I Foyer
A highly stable laser for quantum logic spectroscopy in an optical 27Al+ clock — •Gayatri R. Sasidharan1,2, Benjamin Kraus1,2, Fabian Dawel1,2, Lennart Pelzer1,2, Constantin Nauk1,2, Joost Hinrichs1,2, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunchweig, Germany — 2Leibniz Universität Hannover, Institut für Quantenoptiik, 30167 Hannover, Germany
Optical clocks using trapped 27Al+ clock frequency reaches a fractional frequency uncertainty below 10−18 [1]. This makes it a viable candidate in a transportable setup for relative geodesy measurements at cm height resolution. The cooling and detection transitions of Al+ ion is not directly accessible. Therefore, a co-trapped Ca+ ion is used for sympathetic cooling and state readout through quantum logic spectroscopy. Highly stable lasers are needed to address both logic transitions for 40Ca+ and 27Al+. We present a laser system operating at 729 nm and 1068 nm locked to a Fabry-Pérot cavity of length 5 cm with dual wavelength coating maintained at a pressure 3 x 10−9 mbar [2]. The 729 nm laser is used for the 40Ca+ logic transition. The 1068 nm laser is frequency quadrupled and used for 27Al+ state preparations and quantum logic operations. The results on stability measurements of two lasers onto the same cavity and correlation measurements in photo-thermal noise are shown.
[1] S. M. Brewer, et al., PRL 123, 033201(2019).
[2] Fabian Dawel, et al., arXiv:2311.11610.
Keywords: Optical clocks; Quantum Logic Spectroscopy; Fabry-Perot cavity