Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 65: Quantum gases: Bosons III
Q 65.7: Talk
Friday, March 22, 2013, 15:45–16:00, F 342
Coherence properties of Bose-Einstein condensates in an optical storage ring — •Johannes Küber1, Thomas Lauber1, Felix Schmaltz1, Jordi Mompart2, and Gerhard Birkl1 — 1Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt — 2Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain
We present experiments with Bose-Einstein condensates (BEC) performed in an optical storage ring.
The optical storage ring is a combination of a blue detuned double-ring trapping potential which is formed by conical refraction and a red detuned lightsheet potential which supports the atoms against gravity. The ring shaped trapping potential is created by a birefringent crystal which is appropriately polished and aligned along one of the optical axes. The resulting image in the focal plane resembles two bright rings with a dark ring in between. The trapping potential is loaded with an all-optical BEC created with an multi-mode fiber laser at 1070nm.
The experiments performed in the optical trapping potential show that a coherent transport in this novel structure is possible. The measured coherence length of (2.53 ± 0.75) µ m of a wave packet traveling in the potential resembles the coherence length of a BEC at rest after condensation. Additionally we show different loading techniques of the ring and ongoing analysis of interferometric measurements of BEC in our ring shaped potential.