Dark resonances for ground-state transfer of molecular quantum gases

作者：Mark M J; Danzl J G; Haller E; Gustavsson M; Bouloufa N; Dulieu O; Salami H; Bergeman T; Ritsch H; Hart R; Naegerl H C

来源：Applied Physics B: Lasers and Optics , 2009, 95(2): 219-225.

DOI：10.1007/s00340-009-3407-1

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 >.

• 出版日期2009-5