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A: Atomphysik

A 9: Poster I: Ultrakalte Atome und BEC

A 9.8: Poster

Dienstag, 14. März 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 (ν_r=2400 Hz, ν_z=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.