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MO: Fachverband Molekülphysik
MO 5: MO Poster 1
MO 5.2: Poster
Montag, 9. März 2020, 17:00–19:00, Empore Lichthof
Small waist multimode cavity design for spatially resolved imaging of cold molecules — •Jannis Schnars1, Kai Voges1, Philipp Gersema1, Torsten Hartmann1, Alessandro Zenesini1, Klemens Hammerer2, and Silke Ospelkaus1 — 1Institut für Quantenoptik, Universität Hannover — 2Institut für Theoretische Physik, Universität Hannover
Ultracold polar molecules offer exciting research perspectives due to strong dipole-dipole interactions. Pathways for the creation of ultracold ground state molecules are nowadays well known, the most common is to cool two atomic species close to quantum degeneracy, to associate atoms into loosely bound Feshbach molecules and transfer the molecular ensemble to the ground state by a stimulated Raman adiabatic passage. However, imaging techniques for atoms cannot be applied to molecules due to their complex internal structure with rotational and vibrational degrees of freedom, which often forbids optical cycling on a closed transition. For imaging, the creation process is therefore often reversed, dissociating molecules into atoms for convenient fluorescence or absorption imaging. This technique is highly destructive. Here we present a technique that allows to directly observe the molecules inside a 2D-optical lattice. The detection scheme relies on a dispersive matter-light interaction in the low saturation regime. The interaction is enhanced by a small-waist cavity. Furthermore the cavity is pursued in the multimode regime facilitating spatial resolution of several lattice sites. We present possible resonator geometries combing both requirements of a small waist and frequency degeneracy.