Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 41: Poster – Quantum Technologies II & Laser Technology

Q 41.21: Poster

Wednesday, March 4, 2026, 17:00–19:00, Philo 2. OG

KOAQS -- novel design for compact cold-atom sources — •Constantin Avvacumov, Alexander Herbst, Wei Liu, Ashwin Rajagopalan, Knut Stolzenberg, Daida Thomas, Ernst M. Rasel, and Dennis Schlippert — Leibniz Universität Hannover, Institut für Quantenoptik

Atom interferometers are powerful instruments for fundamental research and geodesy, including applications such as gravimetry. Quantum projection noise and the demand for high sampling rates motivate the development of new high-flux sources of cold atoms. The typical first atom cooling stage of atom interferometers is a two-dimensional magneto-optical trap (2D-MOT). Recent efforts to reduce the SWaP (size, weight and power) of 2D-MOTs have raised questions about the feasibility of integrating optics more closely into the vacuum chamber and the long-term compatibility of high-reflectivity optical coatings exposed to alkali vapor such as potassium or rubidium.

In this poster, we present KOAQS (Kompakte Atomquelle für Quantensensoren) -- a novel high-flux 2D-MOT design with improved SWaP characteristics. To ensure long-term performance, we conduct a systematic analysis of the interaction between Rb vapor and various highly reflective coating materials using accelerated aging tests. The best-performing mirror type is implemented in our 2D-MOT, and we present its functionality and characterization of its performance.

Keywords: 2D-MOT; coating; mirror reflectivity; rubidium; potassium