Resonance Fluorescence

Yu-xi Liu, Chang-qi Cao, Hui W. Cao

The effect of the exciton-exciton interaction on the resonance fluorescence of quantum-well excitons is studied. At relative low exciton density, the resonance fluorescence exists only when the exciton-exciton interaction is not negligible. The fluorescence spectrum changes from one peak to two peaks when the pump light intensity is increased beyond a critical value. The fluorescence light is antibunching when the mean exciton number in the quantum well is more than 0.5. The difference between exciton resonance fluorescence and two-level atom resonance fluorescence is presented.

Miguel Orszag

W. J. Mielniczuk

The spectrum of a resonance fluorescence emitted by a four-level atomic system interacting with three intense laser beams is calculated analytically. The ratios of areas under peaks of the spectrum are obtained as functions of the Rabi frequencies of incident laser beams and Einstein coefficients of the atomic system. Expressions for positions of peaks are given as well. Differences between the double resonance fluorescence spectrum and the triple resonance fluorescence spectrum are indicated.

Vitalii I Gol'danskiĭ

Moorad Alexanian, Subir K. Bose

We present a theory of two-photon resonance fluorescence of an atom or molecule in which the excitation by an external electromagnetic field as well as fluorescence emission is mediated by two-photon processes. The treatment is based on first dressing the atom or molecule by the external field and then evaluating perturbatively the effect of the interaction with the vacuum or fluorescent field and so resonance fluorescence can be considered as spontaneous emission from the dressed atom. The introduction of the combined system of atom and external field via dressed states leads to simpler calculations and more transparent physics. The fluorescence spectrum derived by us has similarities as well as differences with that of one-photon resonance fluorescence and earlier theoretical predictions for the two-photon case.

Miguel Orszag