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.
© 2013 Optical Society of America
Original Manuscript: September 26, 2012
Revised Manuscript: December 12, 2012
Manuscript Accepted: December 12, 2012
Published: January 11, 2013
Vol. 8, Iss. 2 Virtual Journal for Biomedical Optics
S. Villalba, H. Failache, A. Laliotis, L. Lenci, S. Barreiro, and A. Lezama, "Rb optical resonance inside a random porous medium," Opt. Lett. 38, 193-195 (2013)