Düsseldorf 2007 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Poster I - Ultra-cold atoms, ions and BEC
A 14.9: Poster
Dienstag, 20. März 2007, 16:30–18:30, Poster B
All-Optical Realization of a Bose-Einstein Condensation in a Dipole Trap — •Christoph Käfer, Riad Bourouis, Jürgen Eurisch, Maryam Roghani, and Hanspeter Helm — Department of Molecular and Optical Physics, Stefan-Meier-Straße 19, 79104 Freiburg, Germany
We trap up to 3 · 108 87Rb atoms in a conventional 3D-MOT, which is fed from a high pressure 2D-MOT source. The 3D-MOT overlaps spatially with the tight focus of a 27 Watt CO2 laser (initial trap frequencies: vr= 2400 Hz, vz= 160 Hz). The loading of the dipole trap is accomplished in a 60 ms molasses phase with strongly detuned trap laser beams. After transferring about 1 % of the atoms into the dipole trap, we start a phase sequence, where forced evaporation leads to a cold sample of atoms within 5-9 s. Optimizing the last step, a Bose-Einstein Condensate of typically 30000 atoms at densities exceeding 2 · 1013 atoms/cm3 is formed. We discuss the technical setup and give a detailed characterization of the trapped gas throughout the experimental cycle as well as effects of inhomogeneous magnetic fields.