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Proceedings Paper

Sub-Doppler optical resolution by confining a vapour in a nanostructure
Author(s): Philippe Ballin; Elias Moufarej; Isabelle Maurin; Athanasios Laliotis; Daniel Bloch
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Paper Abstract

We show that a thermal vapor confined in a nanostructure is of spectroscopic interest. We perform reflection spectroscopy on a Cs vapour cell whose window is covered with a thin opal film (typically, 10 or 20 layers of ~ 1μm diameter spheres). Sub-Doppler structures appear in the optical spectrum in a purely linear regime of optical excitation and the signal is shown to originate from the interstitial regions of the opal. These narrow spectral structures, observable for a large range of oblique incidence angles (~ 30-50°), are an original feature associated to the 3-D vapor confinement. It remembers a Dicke narrowing, i.e. a Doppler broadening suppression when the atomic motion is sub-wavelength confined. This narrowing, commonly observed in the r.f. domain when a buffer gas ensures a collision confinement effect, had remained elusive in the optical frequency. Also, we describe preliminary experiments performed in a pump-probe technique, intended to elucidate the spatial origin of the narrow contribution. We finally discuss how our results allow envisioning micron-size references for optical frequency clocks, and high resolution spectroscopy of weak and hard-to-saturate molecular lines.

Paper Details

Date Published: 15 March 2013
PDF: 6 pages
Proc. SPIE 8770, 17th International School on Quantum Electronics: Laser Physics and Applications, 87700J (15 March 2013); doi: 10.1117/12.2014735
Show Author Affiliations
Philippe Ballin, Lab. de Physique des Lasers, CNRS, Univ. Paris 13 (France)
Elias Moufarej, Lab. de Physique des Lasers, CNRS, Univ. Paris 13 (France)
Isabelle Maurin, Lab. de Physique des Lasers, CNRS, Univ. Paris 13 (France)
Athanasios Laliotis, Lab. de Physique des Lasers, CNRS, Univ. Paris 13 (France)
Daniel Bloch, Lab. de Physique des Lasers, CNRS, Univ. Paris 13 (France)


Published in SPIE Proceedings Vol. 8770:
17th International School on Quantum Electronics: Laser Physics and Applications
Tanja N. Dreischuh; Albena T. Daskalova, Editor(s)

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