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Q: Quantenoptik

Q 22: Poster: Quantum Effects

Q 22.4: Poster

Thursday, April 5, 2001, 12:30–15:00, AT2

Parametric Dispersion in a Coherent Population System — •Mario Müller, Rolf-Hermann Rinkleff, and Karsten Danzmann — Institut für Atom-und Molekülphysik, Universität Hannover, Callinstr. 38, D-30167 Hannover, Germany

We report on recent experiments on the investigation of absorptive and dispersive properties of a coherently prepared medium, that shows electromagnetically induced transparency on a extremely narrow dark resonance. We have carried out the experimental study of a two photon excitation via quantum interference in a three level cesium atomic system. The phase shift of the coupling laser field was measured with a three beam heterodyne interferometer [1] relative to an off-resonant reference laser field in dependence of the frequency of the probe laser field acting on the second transition. The power of the coupling and the probe field was varied over several orders of magnitude. Even with coupling powers in the nW-range the interferometer shows a good signal-to-noise ratio. The obtained parametric phase shifts are in good agreement with a semiclassical model.

This work was supported by SFB407 of the Deutsche Forschungsgemeinschaft.

[1] M. Müller, F. Homann, R.-H. Rinkleff, A. Wicht, K. Danzmann, Phys, Rev. A 62, 060501(R) (2000)