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John Hall Symposium

SPECTROSCOPY IN EXTREMELY THIN VAPOR CELLS: SENSITIVITY ISSUES

M. Ducloy, Daniel Bloch

Published Mar 28, 2006• 0 citations
Publisher

Abstract

This communication focuses on sensitivity issues - a long-time concern of J. Hall- in the spectroscopic analysis of Extremely Thin Cell of dilute vapor. With these small and often submicrometric slices of vapor, the most uncommon features are the relatively small number of interacting atoms, and the fact that essential results are already obtained in the frame of linear spectroscopy.

DOI
10.1142/9789812773845_0021

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This communication focuses on sensitivity issues - a long-time concern of J. Hall- in the spectroscopic analysis of Extremely Thin Cell of dilute vapor. With these small and often submicrometric slices of vapor, the most uncommon features are the relatively small number of interacting atoms, and the fact that essential results are already obtained in the frame of linear spectroscopy.
We compare the behavior of absorption and of resonance fluorescence spectra in an extremely thin Rb vapor cell as a function of the ratio of $L∕\ensuremath{\lambda}$, with LLL the cell thickness $(L\ensuremath{\sim}150--1800\phantom{\rule{0.3em}{0ex}}\mathrm{nm})$ and $\ensuremath{\lambda}$ the wavelength of the Rb D2{D}_{2}D2​ line $(\ensuremath{\lambda}=780\phantom{\rule{0.3em}{0ex}}\mathrm{mn})$. The Dicke-type coherent narrowing [G. Dutier et al., Europhys. Lett. 63, 35 (2003)] is observed only in transmission measurements, in the linear regime, with its typical collapse and revival, which reaches a maximum for $L=(2n+1)\ensuremath{\lambda}∕2$ (nnn integer). It is shown not to appear in fluorescence, whose behavior-amplitude, and spectral width, is more monotonic with LLL. Conversely, at high-intensity, the sub-Doppler saturation effects are shown to be the most visible in transmission around $L=n\ensuremath{\lambda}$.
The high resolution spectroscopy of nanometric-thin alkali-vapor layers was made possible through the development of extremely thin cell.We have investigated the behavior of the extremely thin cell fluorescence spectra both experimentally and theoretically.Experiment is performed on the D 2 line of Cs-vapor-layer with thickness L = mλ, where m = 0.5, 0.75, 1, 1.25.For open optical transitions, the fluorescence spectra shows narrow dip on the top of the sub-Doppler-width fluorescence profile, at L ≥ λ.In case of closed transition, an extremely small feature in the fluorescence slightly shifted from its maximum is observed at L = (5/4)λ.The used theoretical model, based on the optical Bloch equations is in qualitative agreement with the experimental observations.