Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster Quantengase
Q 64.21: Poster
Donnerstag, 22. März 2007, 16:30–18:30, Poster C
Transport of an ultracold gas of atoms into an ultrahigh-finesse optical cavity — •Ferdinand Brennecke, Tobias Donner, Stephan Ritter, Anton Öttl, Thomas Bourdel, Michael Köhl, and Tilman Esslinger — Institut für Quantenelektronik , ETH Zürich, 8093 Zürich, Schweiz
The combination of Bose-Einstein condensation and cavity quantum electrodynamics in the strong coupling regime opens the possibility to study the interaction of matter fields with a single light field mode in a highly controllable way. Here we report on the first step toward this goal which consists in the controlled transport of an ultracold gas of 87Rb atoms into the mode of a Fabry-Perot type optical resonator of ultrahigh finesse. Our starting point is a Bose-Einstein condensate of about 106 atoms trapped in a magnetic trap located 36 mm above the cavity. We load the atoms into a vertically aligned optical standing wave potential which can be moved with a micrometer resolution by detuning the frequency difference of the two counter-propagating laser beams. Ending up with an ultracold cloud of about 5 × 105 atoms in a crossed beam optical dipole trap intersecting the resonator mode, we reach the regime of very strong coupling in cavity quantum electrodynamics characterized by a cooperativity parameter larger than 106. By optically pumping this coupled atom-cavity system and analyzing the resulting cavity-light spectrum we study cavity enhanced Rayleigh scattering off the atoms and the excitation properties of the system.