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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster Quantengase
Q 27.17: Poster
Tuesday, March 11, 2008, 16:30–19:00, Poster C2
All-optical BEC for an optical lattice experiment with single site addressability — •Jacob Sherson, Oliver Loesdau, Manuel Endres, Jan Petersen, Christof Weitenberg, Immanuel Bloch, and Stefan Kuhr — Institut für Physik,Universität Mainz, Staudingerweg 7, 55128Mainz
In optical lattice experiments, ultracold atoms have to be loaded from a Bose-Einstein condensate (BEC), in order to populate the lowest energy band of the lattice. We report on the generation of a BEC in a crossed optical dipole trap. Laser cooled atoms are transferred from a double MOT system directly into the dipole trap. The dipole trap is formed by a 50 W Yb:YAG fiber laser (1070 nm). The shape of the trap can be dynamically changed by moving the foci of the laser beams. This increases the collision rate and allows for rapid evaporative cooling to the BEC transition within typically 5 s.
The BEC will then be transported by a single beam dipole trap to the experimental region. There, the atoms are transferred into an optical lattice which is placed in front of an ultrahigh resolution optical imaging system. The imaging system is designed to operate at a wavelength of 420.3 nm, corresponding to the 5S1/2 → 6P3/2 transition of 87Rb. It has a numerical aperture of NA = 0.75 yielding a diffraction-limited resolution of about 300 nm, which will allow for the detection of individual sites of the optical lattice.