Collective atomic scattering and motional effects in a dense coherent medium

S. L. Bromley, B. Zhu, M. Bishof, X. Zhang, T. Bothwell, J. Schachenmayer, T. L. Nicholson, R. Kaiser, S. F. Yelin, M. D. Lukin, A. M. Rey () and J. Ye ()
Additional contact information
S. L. Bromley: JILA, University of Colorado
B. Zhu: JILA, University of Colorado
M. Bishof: JILA, University of Colorado
X. Zhang: JILA, University of Colorado
T. Bothwell: JILA, University of Colorado
J. Schachenmayer: JILA, University of Colorado
T. L. Nicholson: JILA, University of Colorado
R. Kaiser: Université de Nice Sophia Antipolis, CNRS, Institut Non-Linéaire de Nice
S. F. Yelin: University of Connecticut
M. D. Lukin: Harvard University
A. M. Rey: JILA, University of Colorado
J. Ye: JILA, University of Colorado

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract We investigate collective emission from coherently driven ultracold 88Sr atoms. We perform two sets of experiments using a strong and weak transition that are insensitive and sensitive, respectively, to atomic motion at 1 μK. We observe highly directional forward emission with a peak intensity that is enhanced, for the strong transition, by >103 compared with that in the transverse direction. This is accompanied by substantial broadening of spectral lines. For the weak transition, the forward enhancement is substantially reduced due to motion. Meanwhile, a density-dependent frequency shift of the weak transition (∼10% of the natural linewidth) is observed. In contrast, this shift is suppressed to

Date: 2016
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DOI: 10.1038/ncomms11039

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