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Q: Fachverband Quantenoptik und Photonik
Q 32: Atom & Ion Clocks and Metrology II
Q 32.2: Vortrag
Mittwoch, 12. März 2025, 11:30–11:45, HS Botanik
Ramsey-Bordé atom interferometry with a thermal strontium beam for a compact optical clock — •Oliver Fartmann1, Marc Christ2, Amir Mahdian1, Vladimir Schkolnik1, Ingmari C. Tietje1, 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 have become increasingly important in field applications and clock networks. Systems based on Ramsey-Bordé interferometry (RBI) with a thermal atomic beam offer higher stability than optical vapour cell clocks while being less complex than cold atom clocks.
Here, we demonstrate RBI with strontium atoms, utilizing the narrow 1S0 → 3P1 intercombination line at 689 nm, yielding a 60 kHz broad spectral feature [1].
The obtained Ramsey fringes for varying laser power are analyzed and compared with a numerical model. The atomic state is detected via fluorescence either on the 1S0 → 1P1 transition at 461 nm or on the 3P1 → 3P0 transition at 483 nm, limited by atomic shotnoise.
We present the experimental setup, our clock stability measurements and our progress towards more compact systems for mobile and space applications.
[1] Fartmann et al. "Ramsey-Borde Atom Interferometry with a Thermal Strontium Beam for a Compact Optical Clock." arXiv preprint arXiv:2409.05581 (2024).
Keywords: Clock; Ramsey; Atom interferometer; Strontium; Cavity