Abstract

Sub-Doppler signals of the hyperfine $\mathrm{Cs}[6^2{P}_{3∕2}\left(F_e\right)\to 6^2{S}_{1∕2}\left(F_g\right)]$ transition lines in a diode laser-induced retro- fluorescence spectrum at the interface between glass and Cs vapor are, for the first time to our knowledge, experimentally identified and phenomenologically investigated. We propose a qualitative explanation of the origin of the sub-Doppler hyperfine line, based on kinematic effects of the population of the excited $6^2{P}_{3∕2}\left(F_e\right)$ atoms of the laser-pumped velocity classes confined in the near-field region of the interface. The role played by different relaxation processes contributing to the retrofluorescent atomic linewidth has been characterized. The effective decay rate of the atomic hyperfine level $6^2{P}_{3∕2}(F_e=5)$ near a metallic thin film has been measured by using both sub-Doppler retrofluorescence and frequency-modulated selective reflection spectroscopies. For a saturated Cs vapor in a glass cell at a temperature of 130°C, the effective nonradiative relaxation rate of the $6^2{P}_{3∕2}(F_e=5)$ energy hyperfine level due to the coupling with a metallic film is estimated to be $A_{F_e=5\to F_g=4}^{\mathrm{nf}}\approx {3.10}^8{\mathrm{s}}^{-1}$.

© 2005 Optical Society of America

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