Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 24: Ultrakalte Moleküle [gemeinsam mit MO]
Q 24.4: Talk
Tuesday, March 11, 2008, 17:15–17:30, 3G
Towards a BEC of Ground State Molecules — •Johann Georg Danzl, Mattias Gustavsson, Elmar Haller, Manfred Mark, and Hanns-Christoph Nägerl — Institut für Experimentalphysik und Forschungszentrum für Quantenphysik, Universität Innsbruck, Innsbruck, Austria
We report on recent progress on optical spectroscopy of ultracold Cs2 Feshbach molecules. Our ultimate goal is the production of ultracold molecules in the rovibrational ground state of the singlet molecular potential [1] and the production of a BEC of ground state molecules. Coherent state transfer with an efficiency approaching unity should be possible by means of stimulated Raman adiabatic passage (STIRAP) [2]. We plan to apply two consecutive two-photon STIRAP steps where the first step will transfer the molecules from the initial Feshbach state to an intermediate vibrational level near ν=70 of the singlet potential. As part of the first step, we have found several strong bound-bound transitions in the wavelength region 1120 nm to 1130 nm, far off resonance from the atomic D1 and D2 lines.
[1] D. Jaksch, V. Venturi, J. I. Cirac, C. J. Williams, and P. Zoller, Creation of a Molecular Condensate by Dynamically Melting a Mott Insulator, Phys.Rev. Lett. 89, 040402 (2002).
[2] K. Winkler, F. Lang, G. Thalhammer, P. v.d. Straten, R. Grimm, J. Hecker Denschlag, Coherent optical transfer of Feshbach molecules to a lower vibrational state, Phys. Rev. Lett. 98, 043201 (2007)