Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 68: Poster – Precision Measurement (joint session Q/A)
Q 68.10: Poster
Thursday, March 5, 2026, 17:00–19:00, Philo 2. OG
Miniaturized Rubidium Two-Photon Frequency Reference Utilizing MEMS Cells — •Daniel Emanuel Kohl1,2, Julien Kluge1,2, Moritz Eisebitt1,2, Janice Wollenberg1, Klaus Döringshoff1,2, Sten Wenzel1, Andreas Wicht1, and Markus Krutzik1,2 — 1Ferdinand-Braun-Institut (FBH) — 2Institut für Physik - Humboldt-Universität zu Berlin
Optical frequency references based on frequency modulation spectroscopy of atomic vapor are promising candidates for the realization of compact optical clocks with applications including optical calibration, synchronization and navigation. We present the development of a miniaturized rubidium two-photon frequency reference using FM spectroscopy of the 5S1/2 → 5D5/2 transition at 778.1 nm. The reference features a 72 ml (67×32.5×33 mm3) spectroscopy unit utilizing microfabricated wafer-bonded rubidium vapor cells.
The spectroscopy unit is driven by a chip-scale ECDL laser as a 778.1 nm light source. We present a first demonstrator achieving short-term fractional frequency instability of 2.8 · 10−12 / √τ up to 200 s, with a flicker floor at 2 · 10−13. These results show the potential of chip-scale rubidium two-photon frequency references. We aim to further miniaturize and integrate the laser system with a microfabricated-cell spectroscopy module to realize a scalable rubidium optical clock.
This work is supported by German Federal Ministry of Research, Technology and Space, under grant number 50WM2164 and within the Research Program Quantum Systems under contract number 13N17491.
Keywords: Clock; Frequency Reference; Rubidium; Two-Photon; MEMS