Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster Ultrakalte Atome
Q 62.11: Poster
Donnerstag, 22. März 2007, 16:30–18:30, Poster C
A combined trap for Rb and Yb atoms — •Sven Kroboth, Nils Nemitz, Florian Baumer, Claudia Höhl, and Axel Görlitz — Institut für Experimentalphysik, Universität Düsseldorf
On this poster, we report on technical aspects of the trap used for our experiments on mixtures of ultracold Ytterbium (Yb) and Rubidium (Rb) atoms.
The different magnetic and electronic properties allow for a combined trap in which the two species can be manipulated independently. The trap consists of a Ioffe-Pritchard-type magnetic trap (MT) for Rb and a bichromatic optical dipole trap (ODT) for Yb employing two copropagating laser beams with wavelengths of 1064 nm and 532 nm and beam waists of 15 µm. By choosing the proper laser power ratio the effect of the light field on Rb can be cancelled to first order. To ensure the spatial overlap of the two ODT trapping beams with the required accuracy better than 1 µm, their positions have to be actively stabilized. To suppress losses during the preparation process the MT and the ODT are initially separated by 700 µm and are loaded consecutively from corresponding MOTs.
With this novel type of combined trap and by means of evaporative and sympathetic cooling, we have successfully prepared a mixture of about 3× 106 87Rb and 2× 105 174Yb atoms at a temperature of 20 µK.