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Rb otical resonance inside a random porous medium

S. Villalba, H. Failache, Athanasios Laliotis, L. Lenci, S. Barreiro, A. Lezama

Published Jan 15, 2013• 0 citations
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Abstract

We studied resonant laser interaction with Rb atoms confined to the interstitial cavities of a random porous glass. Due to diffusive light propagation, the effect of atomic absorption on the light scattered by the sample is almost entirely compensated by atomic fluorescence at low atomic densities. For higher densities, radiation trapping increases the probability of non-radiative decay via atom-wall collisions. A simple connection of the fluorescence/absorption yield to the sample porosity is given.

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We studied resonant laser interaction with Rb atoms confined to the interstitial cavities of a random porous glass. Due to diffusive light propagation, the effect of atomic absorption on the light scattered by the sample is almost entirely compensated by atomic fluorescence at low atomic densities. For higher densities, radiation trapping increases the probability of non-radiative decay via atom-wall collisions. A simple connection of the fluorescence/absorption yield to the sample porosity is given.
We studied resonant laser interaction with Rb atoms confined to the interstitial cavities of a random porous glass. Due to diffusive light propagation, the effect of atomic absorption on the light scattered by the sample is almost entirely compensated by atomic fluorescence at low atomic densities. For higher densities, radiation trapping increases the probability of nonradiative decay via atom-wall collisions. A simple connection of the fluorescence/absorption yield to the sample porosity is given.
We report on the observation of sub-Doppler resonances on the backscattered light from a random porous glass medium with rubidium vapor filling its interstices. The sub-Doppler spectral lines are the consequence of saturated absorption where the incident laser beam saturates the atomic medium and the backscattered light probes it. Some specificities of the observed spectra reflect the transient atomic evolution under confinement inside the pores. Simplicity, robustness, and potential miniaturization are appealing features of this system as a spectroscopic reference.
We studied spectroscopicaly the fluorescence of a long-lived state of Rubidium for the atomic vapor confined to the micrometric interstices of porous glass cells.The system is studied with the aim of investigating the spectroscopic consequences of the confinement of atoms.The exited level is reached through atom-photon transition.Radiation fields interacting with the atoms in the pores of glass are diffuse due to the propagation in this highly scattering medium.The fluorescence spectra obtained have unusual lineshapes that are well described with a simple theoretical model, considering the diffuse characteristic of the light field.The fluorescence spectra lineshape measured do not exhibit effects due to the three dimensional confinement, however, this effect is noticeable when the fluorescence decay time curves are observed.They show a reduction in its decay time compared with the signal in a cell without confinement.
We have studied the pump-probe spectroscopy of rubidium vapor confined to the micrometric interstices of a random porous glass. Due to the propagation in the highly scattering medium, the light fields are randomized inside the sample with significant consequences for the atomic spectra. A two-frequency modulation technique was used to isolate the atomic response proportional to the product of the intensities of the pump and probe fields. Unusual line shapes were observed which include relatively narrow structures that are present in spite of the Doppler broadening due to the atomic velocity distribution. A simple theoretical modeling of the light-atom interaction that assumes statistical isotropy of the diffuse light field and mutual temporal incoherence of the pump and probe fields is presented. Using a single adjustable parameter to account for the atomic confinement, the model successfully describes the diversity of the observed spectral line shapes.
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