Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster II
Q 30.18: Poster
Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster
Towards Continuous Loading of an Optical Dipole Trap with Magnetically Guided Ultra Cold Atoms — •Anoush Aghajani-Talesh, Markus Falkenau, Peter Christian, Axel Griesmaier, and Tilman Pfau — Universität Stuttgart, 5. Physikalisches Institut
Using a Cr BEC the first dipolar quantum gas was investigated recently [1]. So far, however, chromium experiments suffer from low atom numbers below 105 in a single BEC. To substantially improve this number, we develop a novel loading scheme for an optical dipole trap (ODT) using a magnetic guide as source of cold atoms. In this poster we present the status of our experiment: our system is capable of producing a flux of 6.3 · 109 guided atoms/s. To load the ODT, which is formed by a 300 W fiber laser, from this flux, a dissipative process in the ODT region is required. This can be implemented by combining a magnetic field barrier with optical pumping in the trap region. This continuous loading process was studied numerically. Our calculations show, that further reducing the transverse temperature of the guided atoms from currently 1.5 mK can appreciably enhance the ODT loading efficiency. Currently, the feasibility of transverse Doppler cooling in a compressed region in the guide is investigated experimentally.
[1] Lahaye et al., Nature 448 , 672 (2007)