Quantum interference effects in two-photon spectroscopy

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Abstract
Interaction of atoms with two intense coherent time-delayed short pulsed standing waves produces quantum interference effects in the atomic fluorescence. This type of quantum interference effect applied to Doppler-free two-photon spectroscopy (an extension of the Ramsey method of separated r.f. or microwave fields in atomic beam experiments) offers a number of important improvements in the presently available techniques of ultra-high-resolution spectroscopy of atoms, molecules, and crystals.