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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 19, Iss. 12 — Dec. 2, 2002
  • pp: 2852–2862

Laser energy-pooling processes in an optically thick Cs vapor near a dissipative surface

Jean-Marie Gagné, Karine Le Bris, and Marie-Claude Gagné  »View Author Affiliations


JOSA B, Vol. 19, Issue 12, pp. 2852-2862 (2002)
http://dx.doi.org/10.1364/JOSAB.19.002852


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Abstract

We characterize, for the first time to our knowledge, the laser-induced backward fluorescence (retrofluorescence) spectra that result from energy-pooling collisions between Cs atoms near a dissipative thin Cs layer on a glass substrate. We resolve, experimentally and theoretically, the laser spectroscopic problem of energy-pooling processes related to the nature of the glass–metallic vapor interface. Our study focused on the integrated laser-induced retrofluorescence spectra for the 455.5-nm (72P3/2–62S1/2) and 852.2-nm (62P3/2–62S1/2) lines as a function of laser scanning through pumping resonance at the 852.2-nm line. We experimentally investigate the retrofluorescence from 420 to 930 nm, induced by a diode laser tuned either in the wings or in the center of the pumping resonance line. We present a detailed theoretical model of the retrofluorescence signal based on the radiative transfer equation, taking into account the evanescent wave of the excited atomic dipole strongly coupled with a dissipative surface. Based on theoretical and experimental results, we evaluate the effective nonradiative transfer rate Ā62P3/2→62S1/2sf for atoms in the excited 62P3/2 level located in the near-field region of the surface of the cell. Values extracted from the energy-pooling process analysis are equivalent to those found directly from the 852.2-nm resonance retrofluorescence line. We show that the effective energy-pooling coefficients k̃72P3/2 and k̃72P1/2 are approximately equal. The agreement between theory and experiment is remarkably good, considering the simplicity of the model.

© 2002 Optical Society of America

OCIS Codes
(020.2070) Atomic and molecular physics : Effects of collisions
(240.6490) Optics at surfaces : Spectroscopy, surface
(290.2200) Scattering : Extinction
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6490) Spectroscopy : Spectroscopy, surface
(350.2450) Other areas of optics : Filters, absorption

Citation
Jean-Marie Gagné, Karine Le Bris, and Marie-Claude Gagné, "Laser energy-pooling processes in an optically thick Cs vapor near a dissipative surface," J. Opt. Soc. Am. B 19, 2852-2862 (2002)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-19-12-2852

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