AC-Stark shift and photoionization of Rydberg atoms in an optical dipole trap
F. Markert, P. W\"urtz, A. Koglbauer, T. Gericke, A. Vogler, H. Ott
TL;DR
This study measures the AC-Stark shift and photoionization effects on a specific Rydberg state of rubidium in an optical dipole trap, confirming theoretical models and previous experimental data.
Contribution
It provides experimental validation of the ponderomotive potential model for Rydberg atoms and quantifies photoionization effects in an optical dipole trap.
Findings
Good agreement with ponderomotive potential model
Photoionization broadening observed and quantified
Cross-section consistent with previous measurements
Abstract
We have measured the AC-Stark shift of the Rydberg state of rubidium 87 in an optical dipole trap formed by a focussed CO-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. The extracted cross-section is compatible with previous measurements on neighboring Rydberg states.
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