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

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

2005-06-03

arxiv.org/abs/physics/0506025v1

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevA.72.040501

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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