Photon Transport through Dense Atomic Vapor

Two- and three-pulse photon echo spectroscopy in a dense potassium vapor reveals a non-Markovian correlation function of frequency fluctuations. Through comparison with calculations using an exciton picture a slowly-decaying component of the correlation function is attributed to long-range resonant interactions. A time-resolved photon echo experiment shows the photon-echo-like behavior at short timescales.

Laser PhysicsApr 1, 20091 citation

Photon Transport through Dense Atomic Vapor

Nabraj Bhattarai, A. Sieradzan

Published Jun 29, 2015• 0 citations

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We have experimentally studied the nonradiative transport of excitation in a dense

[N

=(0.3-2.5)\ifmmode\times\else\texttimes\fi{}${10}^{17}{\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}]$ potassium vapor. We show that in such a high-density vapor the diffusive nonradiative transport of excitation via ``hopping'' of excitation in dipole-dipole collisions between excited- and ground-state atoms is dominant over the radiative transport through photons. The nonradiative transport mechanism becomes visible in the fluorescence-excitation spectrum signal as a sharp dip close to the resonance frequency. The appearance of the dip, its shape, width, and density dependence can all be explained in terms of a simple diffusion model for the nonradiative transport. This yields values for the diffusion coefficient and the resonance-exchange rate coefficient.

We have experimentally investigated the selective reflection of the $P\ensuremath{-}D$ transition in a high-density rubidium vapor and shown it to be sensitive to the exact spatial distribution of

P

-state atoms near the dielectric-vapor interface. This distribution results from the radiative and nonradiative transport of excitation and from wall-quenching collisions of excited-state atoms and is highly inhomogeneous. Selective reflection thus acts as a probe of the spatial dispersion in the vapor. The resulting spectra have been analyzed to show that the broadening due to $S\ensuremath{-}D$ collisions contributes considerably to the self-broadened linewidth of the $P\ensuremath{-}D$ transition.