Physics – Quantum Physics
Scientific paper
2004-02-20
Revista Mexicana de Fisica 49 (2003) 91-100
Physics
Quantum Physics
17 pages, 5 figures. Didactic article
Scientific paper
Two-photon absorption is theoretically analyzed within the semiclassical formalism of radiation-matter interaction. We consider an ensemble of inhomogeneously broadened three-level atoms subjected to the action of two counterpropagating fields of the same frequency. By concentrating in the limit of large detuning in one-photon transitions, we solve perturbatively the Bloch equations in a non-usual way. In this way we derive an analytical expression for the width of the two-photon resonance that makes evident sub-Doppler two--photon spectroscopy. We also derive an analytical expression for the Stark shift of the two-photon resonance.
de Valcarcel German J.
Perez-Arjona Isabel
Roldan Eugenio
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