Hannover 2010 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 21: Poster I
Q 21.20: Poster
Tuesday, March 9, 2010, 16:00–19:00, Lichthof
State-insensitive micro dipole trap for cesium atoms — •Piyaphat Phoonthong, Peter Douglas, Arne Wickenbrock, and Ferruccio Renzoni — Department of Physics and Astronomy, Univerity College London, WC1 5BT London, UK
We describe the experimental realization of a state-insensitive dipole trap for cesium atoms. By tightly focussing a running beam at the cesium "magic wavelength" of 935.6 nm, we demonstrate trapping of cesium atoms with lifetimes up to 2.5 s. The lifetime is strongly dependent on the actual atomic ground state, as verified with the use of a depumper to control ground state preparation. We measured a beam waist of w0 = (6.69 ± 0.05) µm. For the typical laser power used in the experiment, this results into a trap with depth of 2mK and measured oscillation frequencies equal to ωr/(2π) = (18.5± 0.1) kHz, ωz/(2π)=(550± 10) Hz.