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A: Fachverband Atomphysik
A 39: Poster – Precision Measurement (joint session Q/A)
A 39.11: Poster
Donnerstag, 5. März 2026, 17:00–19:00, Philo 2. OG
Portable implementation of a Ramsey Bordé atom interferometer with a thermal strontium beam for compact optical clocks — •Amir Mahdian1,2, Oliver Fartmann1, Marc Christ2, Levi Wihan1, and Markus Krutzik1,2 — 1Humboldt-Universität, Inst. f. Physik, Newtonstr. 15, 12489 Berlin — 2Ferdinand-Braun-Institut (FBH), Gustav-Kirchhoff-Straße 4, 12489 Berlin
Compact optical atomic clocks based on Ramsey Bordé interferometry (RBI) with thermal atomic beams promise higher stability than optical vapor-cell clocks at substantially reduced complexity compared to cold-atom systems. Building on our previous demonstration[1] on the narrow 1S0→3P1 line of strontium at 689 nm, and using the 3P1→3P0 at 483 nm as an alternative for electron shelving detection, we now report our progress towards a portable RBI clock package. The portable apparatus features an integrated thermal atomic source and vacuum system with an in-vacuum micro-integrated retroreflector, as well as a compact spectroscopy setup. We have performed spectroscopy on the 461 nm transition and implemented frequency-modulation spectroscopy with the portable hardware. We will present the latest status of our setup, including initial stability characterization, and the roadmap to full RBI operation and field deployment. These results outline a path to robust, mobile, and ultimately space-qualified optical frequency references based on thermal-beam interferometry.
[1] O. Fartmann et al., EPJ Quantum Technol. 12, 31 (2025).
Keywords: Clock; Ramsey; Atom interferometer; Strontium; Cavity