Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 23: Ultracold Atoms: Trapping and Cooling 1 (with Q)

A 23.2: Vortrag

Donnerstag, 17. März 2011, 14:45–15:00, SCH A118

AC-Stark shift and photoionization of Rydberg atoms in an optical dipole trap — •Tobias Weber¹, Frank Markert¹, Peter Würtz¹, Andreas Koglbauer², Tatjana Gericke¹, Andreas Vogler¹, and Herwig Ott¹ — ¹Fachbereich Physik, Universität Kaiserslautern — ²Institut für Physik, Universität Mainz

We present the measurement of the AC-Stark shift of the 14D_5/2 Rydberg state of rubidium 87 in an optical dipole trap formed by a focussed CO₂-laser. We find good quantitative agreement with the model of a free electron experiencing a ponderomotive potential in the light field. In order to reproduce the observed spectra we take into account the broadening of the Rydberg state due to photoionization and extract the corresponding cross-section.