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A: Fachverband Atomphysik

A 27: Poster III

A 27.10: Poster

Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof

Rydberg spectroscopy in the strong driving limit for atoms and molecules — •Florian Binoth, Tanita Klas, Jana Bender, Patrick Mischke, Thomas Niederprüm, and Herwig Ott — Department of Physics and Research center OPTIMAS, RPTU Kaiserslautern-Landau

We experimentally deform the 5S-6P potential of Rubidium atoms at large interatomic distances. This deformation leads to a potential shape that supports bound molecular states. To achieve this, we couple off-resonantly to an ultra-long range Rydberg molecule potential using strong laser driving. Properties that are commonly associated with Rydberg molecules are optically admixed to the 5S-6P pair state.

We spectroscopically observe the photoassociated 5S-6P molecules. The change in binding energy for different experimental coupling parameters is in qualitative agreement with a simple theoretical model.

Another effect we investigate is the Autler-Townes splitting in multilevel systems. The strong coupling lifts degeneracies and mixes closely-spaced states. This results in complex spectra deviating from the symmetrical two-level Autler-Townes splitting.

We experimentally investigate these spectra in a thermal cloud of ⁸⁷Rb atoms by resonantly coupling the 6P3/2, F=3 state to a Rydberg state with varying Rabi frequency. Our experiments confirm that multilevel effects have to be considered in the Autler-Townes regime.