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Q: Quantenoptik

Q 1: Poster: Atom Optics

Q 1.13: Poster

Monday, April 2, 2001, 12:30–15:00, AT2

Experimental Studies of Bose-Einstein Condensates in 1D and Quasi-1D Geometries — •Dirk Hellweg, Stefanie Dettmer, Markus Kottke, Holger Schmaljohann, Jan Arlt, Kai Bongs, Sven Burger, Wolfgang Ertmer, and Klaus Sengstock — Institut für Quantenoptik, Universität Hannover, Welfengarten 1, 30167 Hannover

The realization of Bose-Einstein condensation in dilute atomic gases strongly stimulates both experimental and theoretical work in the field of degenerate quantum gases. Of particular interest are low dimensional systems, such as 1D or quasi-1D geometries for cold quantum gases, where a wealth of new phenomena is predicted by theory. To realize these systems experimentally, we have developed a waveguide geometry for atoms based on blue-detuned doughnut light fields. They allow for a strong radial confinement and are open or – in combination with magenetic potentials – closed geometries in the pure 1D or in the so called quasi-1D regime.

We present experimental results on the evaporative cooling of ⁸⁷Rb into a new ’hybrid trap’ (2D optical dipole + 3D magnetic trap) and the subsequent evolution in the ’blue’ dipole trap. The coherence properties of the ensemble during various stages of the experiment are studied by Bragg interferometry.