Frankfurt 2006 – scientific programme
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Q: Quantenoptik und Photonik
Q 21: Ultrakalte Moleküle
Q 21.1: Talk
Tuesday, March 14, 2006, 10:40–10:55, HII
Coherent control of the manipulation of ultracold rubidium molecules — •J. Eng1, W. Salzmann1, U. Poschinger1, R. Wester1, M. Weidemüller1, A. Merli2, S. Weber2, F. Sauer2, M. Plewicki2, F. Weise2, A. Mirabal Esparza2, L. Wöste2, and A. Lindinger2 — 1Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str.3, 79104 Freiburg — 2Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin
We investigate a new scheme for the production of ultracold molecules by manipulating wavepacket dynamics [1]. A pair of ultracold rubidium atoms is excited by a shaped femtosecond (fs) laser pulse creating a molecular wavepacket. The wavepacket is transferred to the electronic groundstate by a second laser pulse. The process is expected to be greatly enhanced by coherent control techniques [2].
Precursor experiments are presented which explore the interaction of fs-pulses with weakly bound Rb molecules in the electronic groundstate. We observe molecular fragmentation through one-photon processes. To demonstrate the applicability of coherent control techniques to ultracold molecules we performed an iterative closed loop experiment aiming to increase this molecule fragmentation by fs-pulses [3]. We achieved an increase in molecular fragmentation by shaped laser pulses compared to transform-limited pulses by 30%.
[1] C. Koch et.al., /physics/0511235
[2] S. Vajda et.al., Chem.Phys. 267,231-239,(2001)
[3] W. Salzmann et. al., /physics/0509056