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arXiv:quant-ph/0305036 · Physical Review A

Spectral dependence of coherent backscattering of light in a narrow-resonance atomic system

D. V. Kupriyanov, I. M. Sokolov, Ларионов Николай Владимирович, P. Kulatunga, Charles I. Sukenik, S. Balik, Mark D. Havey

Published Mar 1, 2004• 32 citations
arXivHTMLPDF

Abstract

We report a combined theoretical and experimental study of the spectral and polarization dependence of near-resonant radiation coherently backscattered from an ultracold gas of $^{85}\mathrm{Rb}$ atoms. Measurements in a $\ifmmode\pm\else\textpm\fi{}6\phantom{\rule{0.3em}{0ex}}\text{MHz}$ range about the $5s\phantom{\rule{0.3em}{0ex}}^{2}S_{1∕2}\ensuremath{\rightarrow}5p\phantom{\rule{0.3em}{0ex}}^{2}P_{3∕2}$, $F=3\ensuremath{\rightarrow}{F}^{\ensuremath{'}}=4$ hyperfine transition are compared with simulations based on a realistic model of the experimental atomic density distribution. In the simulations, the influence of heating of the atoms in the vapor, magnetization of the vapor, finite spectral bandwidth, and other nonresonant hyperfine transitions are considered. Good agreement is found between the simulations and measurements.

DOI
10.1103/physreva.69.033801

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Development of a theoretical treatment of multiple coherent light scattering in an ultracold atomic gas is reported. Specific application is made to coherent backscattering of a weak-radiation field from realistically modeled samples of ultracold atomic 85Rb.{}^{85}\mathrm{Rb}.85Rb. Comprehensive Monte Carlo simulations of the spatial, spectral, and polarization dependence of the backscattering line shape are made and compared with available experimental results.
This thesis reports on the experimental study of coherent radiative transport in an ultracold gas of 85Rb atoms confined in a magneto-optic trap. Measurements are made of the polarization dependence of the spatial and spectral profile of light backscattered from the sample. The results shows an interferometric enhancement sensitive to coherent multiple scattering in the atomic gas, and strong variations with the polarization of the incident and detected light. Effects due to coherent enhancement of weak non-resonant transitions are also observed. Comparison of the measurements with realistic quantum Monte Carlo simulations of Kupriyanov, et al [1] yield very good agreement.
We report a combined experimental and theoretical investigation of near-resonance light scattering from a high-density and ultracold atomic 87{}^{87}87Rb gas. The atomic sample, having a peak density $\ensuremath{\sim}$$5\ifmmode\times\else\texttimes\fi{}{10}^{13}$ atoms/cm3{}^{3}3, temperature $\ensuremath{\sim}$65 $\ensuremath{\mu}$K, and initially prepared in the F=1F=1F=1 lower-energy 87{}^{87}87Rb hyperfine component, is optically pumped to the higher-energy F=2F=2F=2 hyperfine level. Measurements are made of the transient hyperfine pumping process and of the time evolution of scattering of near-resonance probe radiation on the $F=2\ensuremath{\rightarrow}{F}^{\ensuremath{'}}=3$ transition. Features of the density, detuning, and temporal dependence of the signals are attributed to the high density and consequent large optical depth of the samples.
We report an experimental study of correlated multiple light scattering in an ultracold gas of 85Rb{}^{85}\mathrm{Rb}85Rb confined in a magneto-optic trap. Measurements are made of the polarization dependence of the spatial and spectral profile of light backscattered from the sample. The results show an interferometric enhancement sensitive to coherent multiple scattering in the atomic gas, and strong variations with the polarization of the incident and detected light. The spatial width and peak value of the enhancement are found to be dependent on the sample size. Comparison of all the measurements with realistic quantum Monte Carlo simulations yields a very good agreement.
A combined experimental and theoretical investigation of time- and alignment-dependent propagation of light in an ultracold atomic gas of atomic 85Rb^{85}\mathrm{Rb}85Rb is reported. Coherences among the scattering amplitudes for light scattering off excited hyperfine levels produce strong variations of the light polarization in the vicinity of atomic resonance. Measurements are in excellent agreement with Monte Carlo simulations of the multiple scattering process.