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Bulletin of the American Physical Society

Atom Counting by Hyperfine Raman Optical Pumping in Cold Rubidium 87

Joshua A. Carter, Brent Manley Jones, S.J. Roof, Kasie Kemp, Mark D. Havey, Igor M. Sokolov, Dmitriy V. Kupriyanov

Published May 28, 2019• 0 citations
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We observe a density-dependent collective suppression of optical pumping between the hyperfine ground states in an array of submicrometer-sized clouds of dense and cold rubidium atoms. The suppressed Raman transition rate can be explained by strong resonant dipole-dipole interactions that are enhanced by increasing atom density, and are already significant at densities of $\ensuremath{\gtrsim}0.1{k}^{3}$, where kkk denotes the resonance wave number. The observations are consistent with stochastic electrodynamics simulations that incorporate the effects of population transfer via internal atomic levels embedded in a coupled-dipole model.
We have measured light shifts, also known as the A.C. Stark effect, in cold Rubidium atoms using pump-probe spectroscopy.The measurement was made both for atoms in a magneto optical trap (MOT) and for atoms that were in an optical molasses.We show that while the measured light shifts agree with theory for optical molasses there are additional Zeeman shifts in the MOT that the theory does not account for.To the best of our knowledge, this is the first time a careful systematic measurement has been performed in cold atoms of light shift as a function of intensity.
We study optical gain in a gas of cold 39K^{39}\mathrm{K}39K atoms. The gain is observed during operation of a conventional magneto-optical trap without the need for additional fields. Measurements of transmission spectra from a weak probe show that the gain is due to stimulated Raman scattering between hyperfine ground states. The experimental results are reproduced by a simplified six-level model, which also helps explain why such gain is not observed in similar experiments with rubidium or cesium.