DICKE COHERENT NARROWING IN TWO-PHOTON AND RAMAN SPECTROSCOPY OF THIN VAPOUR CELLS

Gabriel Dutier (1) , Petko Todorov (1) , Ismahène Hamdi (1) , Isabelle Maurin (1) , Solomon Saltiel (1) , Daniel Bloch (1) , Martial Ducloy (1)

1 LPL - Laboratoire de Physique des Lasers

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.

Mots clés: spectroscopy; sub-Doppler spectroscopy; thin cell; nanocell; two-photon spectroscopy; Raman spectroscopy

Domaines: Physique Atomique [physics.atom-ph]

Gabriel Dutier, Petko Todorov, Ismahène Hamdi, Isabelle Maurin, Solomon Saltiel, et al.. DICKE COHERENT NARROWING IN TWO-PHOTON AND RAMAN SPECTROSCOPY OF THIN VAPOUR CELLS. 2005. ⟨hal-00005127⟩