Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics I

Q 31.6: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1+2

Loading and in-situ fluorescence imaging of ultracold potassium in an optical trap — •Tobias Wintermantel, Henrik Hirzler, Alda Arias, Stephan Helmrich, Graham Lochead, and Shannon Whitlock — Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg

Ultracold atoms provide a versatile toolbox to study many-body physics with full access to the underlying microscopic properties. We are currently setting up an experiment for potassium atoms confined to reduced dimensions to study the effect of long-range interactions introduced by Rydberg excitation.

We report on a major upgrade of the experimental apparatus to include gray molasses cooling and a quantum gas microscopy setup. Applying gray molasses cooling in a tight optical trap enhances the direct loading from a compressed magneto-optical trap. Low temperatures and high phase-space densities are reached combined with fast experimental cycle times of 1 s. To image the atoms we placed an aspheric objective lens inside the vacuum chamber, which allows direct access to the spatial correlations between atoms. We present the first fluorescence images of potassium-39 atoms in the dipole trap using gray molasses.