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Q: Quantenoptik und Photonik

Q 34: Poster Quantengase

Q 34.7: Poster

Dienstag, 14. März 2006, 16:30–18:30, Labsaal

Detection of Bose-Einstein condensates with partially incoherent light — •Lars Neumann, Christoph Becker, Jochen Kronjäger, Kai Bongs, and Klaus Sengstock — Institut für Laserphysik, Luruper Chaussee 149, Gebäude 69, 22761 Hamburg

When imaging the time evolution of eg 87Rb Bose-Einstein condensates often low optical densities are to be detected with high precision. Interference effects within the detection system, such as parasitic optical resonators together with mechanical oscillations, may impose fringes on the images which are of comparable length and brightness as the structures of interest in the condensate. The fringes can be subtracted by post processing with a set of reference images. However, this procedure is strongly limited if the optical densities of fringes and components are on the same scale. To improve the resolution of our detection system, an offset-locked tunable high power laser is set up. Subsequently the laser light is scattered by a diffusive liquid to remove spatial coherence. The detection of BEC with scattered, partially incoherent light eliminates spurious fringe patterns at the cost of speckle patterns. Our detection set up may allow a resolution of down to 2µm.