%0 Journal Article
%T Dicke Coherent Narrowing in Two-Photon and Raman Spectroscopy of Thin Vapour Cells
%A Gabriel Dutier
%A Petko Todorov
%A Ismah¨¨ne Hamdi
%A Isabelle Maurin
%A Solomon Saltiel
%A Daniel Bloch
%A Martial Ducloy
%J Physics
%D 2005
%I arXiv
%R 10.1103/PhysRevA.72.040501
%X The principle of coherent Dicke narrowing in a thin vapour cell, in which sub-Doppler spectral lineshapes are observed under a normal irradiation for a l/2 thickness, is generalized to two-photon spectroscopy. Only the sum of the two wave vectors must be normal to the cell, making the two-photon scheme highly versatile. A comparison is provided between the Dicke narrowing with copropagating fields, and the residual Doppler-broadening occurring with counterpropagating geometries. The experimental feasibility is discussed on the basis of a first observation of a two-photon resonance in a 300 nm-thick Cs cell. Extension to the Raman situation is finally considered.
%U http://arxiv.org/abs/physics/0506025v1