Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster: Quantum Optics and Photonics II
Q 27.35: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
QUANTUS-2 - towards a dual species matter wave interferometer in free fall — •Christoph Grzeschik1, Markus Krutzik1, Achim Peters1,2, and THE QUANTUS Team1,2,3,4,5,6,7 — 1Institut für Physik, Humboldt-Universität zu Berlin — 2Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Berlin — 3Institut für Quantenoptik, Leibniz Universität Hannover — 4ZARM, Universität Bremen — 5Institut für Physik, Johannes Gutenberg Universität Mainz — 6Institut für Quantenphysik, Universität Ulm — 7Institut für angewandte Physik, TU Darmstadt
QUANTUS-2 is a mobile high-flux Rb-87 BEC source used for experiments in microgravity in the Bremen drop tower. To further decrease the residual expansion rate of the BEC, magnetic lensing - also known as delta-kick cooling - is crucial for observations after long evolution times in the range of seconds. Here we present our results of a lens, which leads to an observability of the BEC of up to 2.7 s after free expansion, only limited by the microgravity-duration in the drop tower. Anharmonicities of the magnetic lensing potential can introduce distortions of the BEC's shape. We discuss the neccessary steps towards harmonic lensing and report our results. This will - in the future - allow us to demonstrate atom interferometry with unprecedented sensitivity on time scales on the order of seconds.
The QUANTUS project is supported by the German Space Agency DLR with funds provided by the Federal Ministry for Economic Affairs and Energy (BMWi) under grant number DLR 50WM1553.