Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 32: Atom & Ion Clocks and Metrology II
Q 32.4: Talk
Wednesday, March 12, 2025, 12:00–12:15, HS Botanik
Towards Miniaturized Spaceborne Rubidium Two-Photon Frequency References — •Daniel Emanuel Kohl1,2, Julien Kluge1,2, Moritz Eisebitt1,2, Janice Wollenberg1, Klaus Döringshoff1,2, and Markus Krutzik1,2 — 1Institut für Physik - Humboldt-Universität zu Berlin — 2Ferdinand-Braun-Institut (FBH)
We present the development of a miniaturized rubidium two-photon frequency reference using the 5S1/2 → 5D5/2 transition at 778.1 nm, in the context of the CRONOS project. The goal of the project is to demonstrate an optical clock on a micro-satellite in low earth orbit. Recent development of miniaturized two-photon references based on atomic vapor spectroscopy allow for the realization of compact clocks for application in next generation global navigation satellite systems.
We report on beat-note measurements between two laboratory-based references showing a fractional frequency instability below 1.7 · 10−13/√τ, reaching 6· 10−15 for an averaging time τ of 1000 s. We further present a prototype of a compact spectroscopy module achieving instabilities in the regime of 10−13/√τ. The design comprises a volume below 0.5 l, mass below 1 kg and power consumption below 10 W. We show preliminary results of a frequency reference utilizing MEMS rubidium vapor cells, as a step towards chip-scale devices.
This work is supported by the German Space Agency (DLR) with funds provided by the Federal Ministry for Economic Affairs and Climate Action (BMWK) due to an enactment of the German Bundestag under grant numbers 50RK1971, 50WM2164.
Keywords: Clock; Frequency Reference; Rubidium; Two-Photon; Space