Light-shift tomography in an optical-dipole trap for neutral atoms

Abstract : We report on light-shift tomography of a cloud of 87 Rb atoms in a far-detuned optical-dipole trap at 1565 nm. Our method is based on standard absorption imaging, but takes advantage of the strong light-shift of the excited state of the imaging transition, which is due to a quasi-resonance of the trapping laser with a higher excited level. We use this method to (i) map the equipotentials of a crossed optical-dipole trap, and (ii) study the thermalisation of an atomic cloud by following the evolution of the potential-energy of atoms during the free-evaporation process.
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Jean-Philippe Brantut, Jean-François Clément, Martin Robert-De-Saint-Vincent, Gaël Varoquaux, Robert Nyman, et al.. Light-shift tomography in an optical-dipole trap for neutral atoms. Physical Review A, American Physical Society, 2008, 78, pp.031401 (R). ⟨10.1103/PhysRevA.78.031401⟩. ⟨hal-00303321⟩

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