Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster Ultrakalte Atome
Q 62.14: Poster
Donnerstag, 22. März 2007, 16:30–18:30, Poster C
A Rod in the MOT – Influence of an Ultra-Thin Optical Fiber on a Cold Atom Cloud — •Eugen Vetsch1,2, Guillem Sagué1,2, Wolfgang Alt1, Dieter Meschede1, and Arno Rauschenbeutel1,2 — 1Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, 53115 Bonn — 2Institut für Physik, Universität Mainz, Staudingerweg 7, 55128 Mainz
We inserted a sub-wavelength diameter optical fiber into a standard magneto-optical trap (MOT), in order to couple cold Caesium atoms to the guided mode of this ultra-thin fiber. The atoms are probed with a laser launched through the fiber while temporarily switching off all MOT laser beams. The presence of the fiber has no significant influence on the global shape or size of the MOT. In the immediate vicinity of the fiber surface, the density of the freely expanding cloud of cold atoms is however strongly modified through light-induced dipole forces and the van der Waals force. The predictions of a numerical model taking into account these forces are in excellent agreement with our experimental observations.
We acknowledge financial support by the DFG research unit 557.