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Q: Fachverband Quantenoptik und Photonik
Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects
Q 26.32: Poster
Dienstag, 11. März 2025, 14:00–16:00, Tent
Numerical simulations and differential wavefront analysis for a Ramsey-Bordé interferometry based optical clock — •Levi Wihan1, Oliver Fartmann1, Amir Mahdian1, Vladimir Schkolnik1, Ingmari Tietje1, and Markus Krutzik1,2 — 1Humboldt-Universität, Inst. f. Physik, Newtonstr. 15, 12489 Berlin — 2Ferdinand-Braun-Institut (FBH), Gustav-Kirchhoff-Straße 4, 12489 Berlin
We develop a compact optical atomic clock based on Ramsey-Bordé interferometry (RBI) with a thermal strontium beam. This atomic beam clock leverages the narrow 1S0 → 3P1 intercombination line at 689 nm, offering enhanced stability compared to vapour cell clocks and greater simplicity than cold atom clocks, making it well-suited for field applications and clock networks. Given RBI’s sensitivity to the wavefront of the interrogating laser, we investigated the impact of wavefront aberrations by adapting a numerical RBI model to include Gaussian beam effects, traditionally neglected in plane-wave approximations. The model guided the optimization of key beam parameters such as waist size and position. To mitigate wavefront aberrations in the portable setup, which is in development, wavefront analysis of the used optical elements is necessary. Therefore, we developed a workflow using a Shack-Hartmann wavefront sensor which is independent of the beam’s position on the detector. Using differential wavefront analysis we identify sources of aberrations, which helps to ensure consistent beam quality throughout the interferometer.
Keywords: Clock; Atom interferometer; Wavefront analysis; Gaussian beam; Strontium