Dark resonances for ground state transfer of molecular quantum gases

Details Dark resonances for ground state transfer of molecular quantum gases Dark resonances for ground state transfer of molecular quantum gases

2008-11-05

arxiv.org/abs/0811.0695v1

Appl. Phys. B 95, 219-225 (2009)

Physics

Quantum Physics

7 pages, 4 figures

Scientific paper

10.1007/s00340-009-3407-1

One possible way to produce ultracold, 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 ultracold samples of Cs_2 molecules, we observe two-photon dark resonances that connect the intermediate rovibrational level |v=73,J=2> with the rovibrational ground state |v=0,J=0> of the singlet $X^1\Sigma_g^+$ ground state potential. For precise dark resonance spectroscopy we exploit the fact that it is possible to efficiently populate the level |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 |v=0,J=0>.

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