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Related Experiment Video

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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

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Rb optical resonance inside a random porous medium.

S Villalba¹, H Failache, A Laliotis

¹Instituto de Física, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay.

|March 5, 2013

Summary

We investigated laser light interacting with rubidium (Rb) atoms in porous glass. At low densities, fluorescence balances absorption, but higher densities lead to nonradiative decay through atom-wall collisions.

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Area of Science:

Atomic physics
Laser-matter interactions
Condensed matter physics

Background:

Understanding light propagation in disordered media is crucial.
Atomic interactions within confined spaces present unique phenomena.
Porous materials offer novel environments for atomic studies.

Purpose of the Study:

To investigate resonant laser interaction with rubidium (Rb) atoms in porous glass.
To analyze the interplay between atomic absorption, fluorescence, and light diffusion.
To determine the influence of atomic density and radiation trapping on optical properties.

Main Methods:

Studied resonant laser interaction with Rb atoms.
Confined atoms within the interstitial cavities of random porous glass.
Analyzed diffusive light propagation and its effects on scattered light.
Investigated atomic fluorescence and absorption yields.

Main Results:

At low atomic densities, atomic fluorescence nearly compensates for absorption due to diffusive light propagation.
At higher densities, radiation trapping enhances nonradiative decay via atom-wall collisions.
A direct relationship between fluorescence/absorption yield and sample porosity was established.

Conclusions:

The optical properties of Rb atoms in porous glass are strongly influenced by atomic density and confinement.
Radiation trapping and atom-wall collisions play significant roles at higher atomic densities.
The study provides a method to link optical measurements to the porosity of the material.