Raman laser spectroscopy of Wannier Stark states

Gunnar Tackmann (1) , Bruno Pelle (1) , Adèle Hilico (1) , Quentin Beaufils (1) , Franck Pereira dos Santos (1)

1 SYRTE - Systèmes de Référence Temps Espace

Raman lasers are used as a spectroscopic probe of the state of atoms confined in a shallow 1D vertical lattice. For long enough laser pulses, resolved transitions in the bottom band of the lattice between Wannier Stark states corresponding to neighboring wells are observed. Couplings between such states are measured as a function of the lattice laser intensity and compared to theoretical predictions, from which the lattice depth can be extracted. Limits to the linewidth of these transitions are investigated. Transitions to higher bands can also be induced, as well as between transverse states for tilted Raman beams. All these features allow for a precise characterization of the trapping potential and for an efficient control of the atoms external degrees of freedom.

Mots clés: cold atoms; optical lattice; Raman spectroscopy; Wannier Stark states

Domaines: Physique Atomique [physics.atom-ph]

Gunnar Tackmann, Bruno Pelle, Adèle Hilico, Quentin Beaufils, Franck Pereira dos Santos. Raman laser spectroscopy of Wannier Stark states. 2011. ⟨hal-00629340v2⟩