Rostock 2019 – scientific programme
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A: Fachverband Atomphysik
A 26: Atomic systems in external fields
A 26.4: Poster
Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik
A laser system for imaging of rubidium at high magnetic fields — •Jennifer Koch1, Daniel Adam1, Quentin Bouton1, Daniel Mayer1, Jens Nettersheim1, Felix Schmidt1, and Artur Widera1,2 — 1Departmet of Physics and State Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany
Impurities in quantum systems are the origin of many fascinating phenomena such as polarons or the Kondo system, for example. Our approach to realize such a system immerses cold single cesium atoms as impurities into an ultracold quantum gas of rubidium. The interaction between the two species can be tuned by magnetic Feshbach resonances at magnetic fields of up to 350 G. In order to characterize our impurity-BEC system, absorption imaging for rubidium and fluorescence imaging for cesium is employed, where resonant light is required in both cases.
In order to allow imaging of or removing the rubidium cloud from the system at high magnetic field, we have constructed a diode-based laser system. At field strengths above 200 G, transition frequencies are shifted by the order of some GHz due to the magnetic field. The stabilization of the linear interference-filter lasers used is based on a flexible frequency offset locking scheme. We present characterization of the system and current status of the project. The system will allow high-field and in-situ imaging of cesium impurities and the rubidium BEC.