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Q: Fachverband Quantenoptik und Photonik

Q 61: Poster Quanteneffekte

Q 61.10: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster C

An ultracold gas of Rydberg atoms — •Janne Denskat, Christian Giese, Thomas Amthor, Markus Reetz-Lamour, and Matthias Weidemüller — Physikalisches Institut Universität Freiburg, Hermann-Herder-Str.3, 79104 Freiburg

We report on the investigation of different interaction and excitation phenomena in ultracold Rydberg gases. With our setup we confine ⁸⁷Rb atoms in a magneto-optical trap and excite a part of the atomic cloud into Rydberg levels via a two-photon process (780 nm and 480 nm). We present experimental details and results of the latest works. These include coherent Rabi oscillations between ground and Rydberg state [1] and stimulated rapid adiabatic passage, transferring 90% of the gas into Rydberg states [2], ionization induced by van der Waals forces [3], the understanding of the coherent dynamics of resonant energy transfer processes [4] and the dipole blockade in a mesoscopic gas.

[1] M. Reetz-Lamour et al., submitted

[2] J. Deiglmayr et al., Opt. Comm. 264, 293 (2006)

[3] T. Amthor et al., Phys. Rev. Lett., in press

[4] S. Westermann et al., Eur. Phys. J. D 40, 37 (2006)