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

Abstract : Literature mentions only incidentally a sub-Doppler contribution in the excitation spectrum of the backward fluorescence of a dense vapor. This contribution 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 a strongly absorbing medium, the quenching of excited atoms moving towards a window irradiated under near normal incidence reduces the fluorescence on the red side of the excitation spectrum. Atoms moving slowly towards the window produce a sub- Doppler velocity-selective contribution, whose visibility is here improved by applying a frequency-modulation technique. This sub-Doppler feature, induced by a surface quenching combined with a short absorption length for the incident irradiation, exhibits close analogies with the narrow spectra appearing with thin vapor cells. We also show that a normal incidence irradiation is essential for the sub-Doppler feature to be observed, while it should be independent of the detection geometry
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Physical Review A, American Physical Society, 2017, 〈10.1103/PhysRevA.96.043405〉
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https://hal.archives-ouvertes.fr/hal-01610869
Contributeur : Daniel Bloch <>
Soumis le : jeudi 5 octobre 2017 - 10:05:29
Dernière modification le : jeudi 11 janvier 2018 - 06:18:12

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João Carlos de Aquino Carvalho, Athanasios Laliotis, Martine Chevrollier, Marcos Oriá, Daniel Bloch. Backward-emitted sub-Doppler fluorescence from an optically thick atomic vapor. Physical Review A, American Physical Society, 2017, 〈10.1103/PhysRevA.96.043405〉. 〈hal-01610869〉

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