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Q: Fachverband Quantenoptik und Photonik

Q 8: Quantum Gases (Bosons) II

Q 8.5: Vortrag

Montag, 14. März 2022, 17:30–17:45, Q-H10

High signal to noise imaging of potassium at high magnetic fields — •Maurus Hans, Celia Viermann, Marius Sparn, Nikolas Liebster, Helmut Strobel, and Markus K. Oberthaler — Kirchhoff-Institut für Physik, Universität Heidelberg, Deutschland

In 39K a broad Feshbach resonance at 560G allows for the tuning of the atomic interaction over a wide range. To detect the in-situ atomic density with high spatial resolution, direct imaging at this field is necessary. However, for the F=1 ground state manifold a closed optical transistion does not exist. In this talk, we present an imaging scheme that utilises four atomic levels and two laser frequencies to get an approximately closed optical cycle [1]. It allows for a drastic enhancement of the number of scattered photons. We demonstrate the extraction of the atomic column density of a 39K Bose-Einstein condensate with absorption imaging and show the suitability of the scheme for fluorescence imaging of few atoms per detection volume.

[1] Hans, M. et al., Rev. Sci. Instrum. 92, 023203 (2021)