Frankfurt 2006 – wissenschaftliches Programm

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A: Atomphysik

A 3: Ultrakalte Atomphysik I: Plasmen und Rydbergsysteme

A 3.3: Vortrag

Montag, 13. März 2006, 17:15–17:30, H6

High-Resolution Rydberg-spectroscopy on ultracold Rubidium atoms — •Rolf Heidemann, Axel Grabowski, Vera Bendkowsky, Eva Kuhnle, Jürgen Stuhler, and Tilman Pfau — Universität Stuttgart, 5. Physikalisches Institut, Pfaffenwaldring 57, 70550 Stuttgart

Rydberg atoms can have - depending on the state - huge static electric dipole moments, so they are perfectly suited for the investigation of electric dipole-dipole interaction. The project is also devoted to the investigation of the interaction between Rydberg atoms and ground-state atoms of a BEC [1].

The starting point of our Rydberg spectroscopy measurements is a cloud of magneto-optically trapped ⁸⁷Rb-atoms. Using two narrow band, frequency stabilized cw laser systems, we perform two-photon excitation via the 5P_3/2-level of ground state (5S_1/2) Rb atoms to Rydberg states.

For our objectives, we need high spectral resolution and precise control of the Rabi-frequencies on both of the transitions. To demonstrate the spectral resolution and stability of our system, we investigated the Stark splitting of the two 41D-finestructure-states by measuring the number of Rydberg atoms as a function of the excitation frequency and the electric fields. We found it to be in excellent agreement with our calculations using perturbation theory on the Rb-wavefunctions. The Rabi-frequencies were measured by observation of the Autler-Townes-splitting while driving one of the transitions strongly and probing the other one [2].

[1] Chris H. Greene et al., PRL 85 (2000) 2458

[2] Axel Grabowski et al., arXiv:quant-ph/0508082 v1