Dark resonances for ground-state transfer of molecular quantum gases

Mark, M. J. and Danzl, J. G. and Haller, E. and Gustavsson, M. and Bouloufa, N. and Dulieu, O. and Salami, H. and Bergeman, T. and Ritsch, H. and Hart, R. and Nägerl, H.-C. (2009) Dark resonances for ground-state transfer of molecular quantum gases. Applied Physics B: Lasers and Optics, 95 (2). pp. 219-225. ISSN 0946-2171

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Abstract

One possible way to produce ultra-cold, high-phase-space-density quantum gases of molecules in the rovibronic ground state is given by molecule association from quantum-degenerate atomic gases on a Feshbach resonance and subsequent coherent optical multi-photon transfer into the rovibronic ground state. In ultra-cold samples of Cs(2) molecules, we observe two-photon dark resonances that connect the intermediate rovibrational level vertical bar v=73,J=2 > with the rovibrational ground state vertical bar v=0,J=0 > of the singlet X (1) I pound (g) (+) ground-state potential. For precise dark resonance spectroscopy we exploit the fact that it is possible to efficiently populate the level vertical bar v=73,J=2 > by two-photon transfer from the dissociation threshold with the stimulated Raman adiabatic passage (STIRAP) technique. We find that at least one of the two-photon resonances is sufficiently strong to allow future implementation of coherent STIRAP transfer of a molecular quantum gas to the rovibrational ground state vertical bar v=0,J=0 >.