Measurement of the Rb D2 transition linewidth at ultralow temperature
Physics Dept., Petrie Bldg., York University, 4700 Keele St., M3J 1P3, Toronto, Canada
Corresponding author: a firstname.lastname@example.org
Revised: 8 March 2008
Published online: 6 June 2008
The Rb D2 linewidth was studied using atoms cooled to a temperature of 50 μK that were contained in a magneto-optical trap. The transmission of a probe laser through the atom cloud was monitored using a CCD detector. The frequency of the probe laser was scanned across the resonance using an acousto-optic modulator. The observed lineshape was very well fitted by a Lorentzian function. The full width half maximum linewidth was examined as a function of the optical depth and the probe laser intensity. The extrapolated value at zero optical depth 6.062 ± 0.017 MHz corresponds to a 5P3/2 lifetime of 26.25 ± 0.07 ns. This result agrees with lifetimes found in experiments that measured the temporal decay of fluorescence or photoassociation spectroscopy and is somewhat below the result of a relativistic many body perturbation calculation.
PACS: 32.70.Jz – Line shapes, widths, and shifts / 32.70.Cs – Oscillator strengths, lifetimes, transition moments
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008