Open-channel fluorescence imaging of atoms in high-gradient magnetic fields
FOCUS Center, Physics Department, University of Michigan, 450 Church Street, Ann Arbor, Michigan, 48109-1120, USA
Corresponding author: a email@example.com
Revised: 20 June 2006
Published online: 10 November 2006
A method of imaging distributions of cold atoms under the presence of large trapping-field-induced level shifts is investigated. By utilizing a probe laser tuned to an open transition, the fluorescence yield per atom is largely fixed throughout the trap volume, independent of the trapping field. This enables a reliable conversion of fluorescence images into atomic-density profiles. The method is applied to measure distributions of 87Rb atoms in a high-gradient (2.7 kG/cm) magnetic atom guide. We characterize the parameters for which the open-channel imaging method performs best. Results of quantum Monte Carlo simulations verify the underlying assumptions of the method.
PACS: 32.50.+d – Fluorescence, phosphorescence (including quenching) / 32.80.-t – Photon interactions with atoms
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006