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arXiv:1706.04868 · Physical Review A

Two-photon excitation of rubidium atoms inside porous glass

Lucía Amy, L. Lenci, S. Villalba, H. Failache, A. Lezama

Published Oct 10, 2017• 3 citations
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Abstract

We study the two-photon laser excitation to the $5{D}_{5/2}$ energy level of $^{85}\mathrm{Rb}$ atoms contained in the interstices of a porous material made from sintered ground glass with typical pore dimensions in the 10--100 $\ensuremath{\mu}\mathrm{m}$ range. The excitation spectra show unusual flat-top line shapes, which are shown to be the consequence of wave-vector randomization of the laser light in the porous material. For large atomic densities, the spectra are affected by radiation trapping around the ${D}_{2}$ transitions. The effect of the transient atomic response limited by the time of flight between pores walls appears to have a minor influence in the excitation spectra. It is however revealed by the shortening of the temporal evolution of the emitted blue light following a sudden switch-off of the laser excitation.

DOI
10.1103/physreva.96.043819

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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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