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 >.
Original language | Undefined/Unknown |
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Pages (from-to) | 219-225 |
Number of pages | 7 |
Journal | Applied Physics B: Lasers and Optics |
Volume | 95 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Feb 2009 |
Keywords
- molecular quantum gases
- dark resonances
- optics