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Bulletin of the American Physical Society

Time-dependent electromagnetic wave dynamics in ultracold, high-density Rb vapor

Mark D. Havey, Salim Balik, Charles I. Sukenik, Dmitriy V. Kupriyanov, Igor M. Sokolov

Published Mar 9, 2007• 0 citations
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We investigate the time dynamics of light-induced desorption of Rb atoms in hollow-core photonic-band-gap fibers and demonstrate all-optical generation of precisely controlled Rb-vapor densities. We also compare the performance of the desorption process in an unmodified fiber with one with an organosilane-coated core, and based on the vapor depletion and recovery behavior, we propose a mechanism to describe the desorption processes. We further demonstrate that high densities of Rb vapor can be generated after the desorption beam is switched off and use it to realize $\ensuremath{\Lambda}$-scheme electromagnetically induced transparency at control powers as low as 80 nW.
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 85Rb atoms. Measurements in an approximate 6 MHz range about the 5s 2S1/2 → 5p2P3/2, F=3 → F' =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.