Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster II

Q 30.16: Poster

Tuesday, March 3, 2009, 16:30–19:00, VMP 9 Poster

Combining a magnetic Feshbach resonance with an optical bound-to-bound transition — •Christoph Vo, Dominik Bauer, Matthias Lettner, Gerhard Rempe, and Stephan Dürr — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany

We use optical coupling between bound molecular states to control the properties of a magnetic Feshbach resonance in ⁸⁷Rb. For far detuned light the coupling causes an ac-Stark shift of the molecular states. This shifts the position of the magnetic Feshbach resonance which couples an incoming atomic state to the ground state of the optical transition. In this way we can shift the resonance away from 1007.4 G by ∼0.5 G, which is more than the width of the resonance. Application of the light can change the scattering length by an amount comparable to the background value. The light induces two-body loss with a rate coefficient of ∼10⁻¹²cm³/s, which is much less than for an optical Feshbach resonance.

With the light close to resonance we observe an Autler-Townes doublet which is probed by the magnetic Feshbach resonance. We measure the two-body loss coefficient as a function of magnetic field for different optical detunings to obtain the transition frequency, the transition dipole matrix element, the excited state’s magnetic moment and its lifetime.