Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster Quantengase
Q 64.18: Poster
Donnerstag, 22. März 2007, 16:30–18:30, Poster C
A new generation all-optical Cesium BEC — •Manfred Mark, Gabriel Rojas-Kopeinig, Anton Flir, Elmar Haller, Mattias Gustavsson, and Hanns-Christoph Nägerl — Institut für Experimentalphysik, Universität Innsbruck, Austria
We report on producing a BEC with Cs atoms in a new generation setup. The condensate with 105 atoms is formed every 8 sec in a glass cell apparatus with maximum optical access and fast magnetic field control.
A BEC of Cs atoms with tunable s-wave scattering length and several Feshbach resonances at low magnetic fields represents an ideal starting point for experiments in which the interaction properties are to be tuned and for the production of ultracold molecules.
After optical pre-cooling we load 107 atoms at a temperature of 1 µK into a large-volume crossed optical dipole trap generated by a high power fiber laser. To reach degeneracy the atoms are transferred to a focused crossed ”dimple” trap where the density is high enough to allow for efficient evaporation.
Here we report on our progress with setting up an atom interferometer in the non-interacting limit to determine the fine structure constant α via a measurement of the photon recoil frequency* without perturbing mean-field shifts.
* S. Gupta et al., Phys. Rev. Lett. 89 140401 (2002)