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A: Atomphysik
A 9: Poster I: Ultrakalte Atome und BEC
A 9.8: Poster
Tuesday, March 14, 2006, 16:30–18:30, Labsaal
Bose-Einstein Condensation in a far detuned dipole trap — •Riad Bourouis, Ajay Tripathi, Christoph Kaefer, Morten Franz, and Hanspeter Helm — Physikalisches Institut Albert-Ludwigs Universitaet Freiburg
We employ a double-MOT system where atoms are first collected and precooled in 3D-geometry in a high pressure region. From this source region the atoms are efficiently transferred into a conventional MOT inside a UHV chamber with capture rates exceeding 108 atoms/s. After a loading time of 1s and a molasses phase of 60 ms about 1% of the atoms are trapped in a tight CO2 Laser focus (νr=2400 Hz, νz=150 Hz). Evaporative Cooling is optimized by lowering the dipole trap depth over a 7s period, leading to condensates of typically 30000 atoms at densities exceeding 2 1013 atoms/cm3. We present a detailed characterization of the system and its diagnostic tools.