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Dicke Coherent Narrowing in Two-Photon and Raman Spectroscopy of Thin Vapour Cells

Gabriel Dutier·Petko Todorov·Ismahène Hamdi·Isabelle Maurin·Solomon Saltiel·Daniel Bloch·Martial Ducloy
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Abstract

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.

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Gabriel Dutier, Petko Todorov, Ismahène Hamdi, Isabelle Maurin, Solomon Saltiel, Daniel Bloch, Martial Ducloy. 2005-06-03. Dicke Coherent Narrowing in Two-Photon and Raman Spectroscopy of Thin Vapour Cells. https://doi.org/10.1103/physreva.72.040501

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