Dresden 2011 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Gases: Bosons 1

Q 2.3: Talk

Monday, March 14, 2011, 11:00–11:15, HÜL 386

Bose-Einstein condensates in optical micro-potentials — •Johannes Küber, Thomas Lauber, Martin Hasch, Oliver Wille, and Gerhard Birkl — Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt

Our experiment provides an approach for the coherent manipulation and transport of atoms in optical potentials. We prepare an all-optical Bose-Einstein Condensate (BEC) of 25000 Rb atoms in a crossed optical dipole trap at 1070nm.

Our experiment allows us to create different attractive and repulsive trapping potentials by using miniaturized lenses. Furthermore we can combine these potentials to complex geometries like one dimensional resonators, disk-shaped potentials or toroidal potentials. A one-dimensional optical lattice gives us the ability to control the momentum of atoms loaded into these guiding structures.

In a first set of experiments we demonstrated an interferometer in a one-dimensional waveguide. Therefore we stored the atoms in the waveguide and create a coherent superposition of momentum states with the 1D lattice. In another set of experiments we loaded a BEC in a ring shaped attractive potential and used the ring as a guiding structure for accelerated atoms.