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Literature mentions only incidentally a sub-Doppler contribution in theexcitation spectrum of the backward fluorescence of a dense vapor. Thiscontribution is here investigated on Cs vapor, both on the first resonance line(894 nm) and on the weaker second resonance line (459 nm). We show that in astrongly absorbing medium, the quenching of excited atoms moving towards awindow irradiated under near normal incidence reduces the fluorescence on thered side of the excitation spectrum. Atoms moving slowly towards the windowproduce a sub- Doppler velocity-selective contribution, whose visibility ishere improved by applying a frequency-modulation technique. This sub-Dopplerfeature, induced by a surface quenching combined with a short absorption lengthfor the incident irradiation, exhibits close analogies with the narrow spectraappearing with thin vapor cells. We also show that a normal incidenceirradiation is essential for the sub-Doppler feature to be observed, while itshould be independent of the detection geometry

Backward-emitted sub-Doppler fluorescence from an optically thick atomic vapor