Collisional Effects in Resonance Fluorescence
The collisional redistribution of near resonant scattered light has been extensively studied both experimentally  and theoretically [2 to 16]. The usual perturbative picture given for such a redistribution is sketched on Fig. 1. In the absence of collisions and at the lowest order in the laser intensity, the fluorescence spectrum is given by the elastic Rayleigh scattering process of Fig. la. Collisions are responsible for the appearance of a new fluorescence line around ω0 which can be interpreted as due to collision induced transitions populating the excited atomic level e from the “virtual” level reached after the absorption of a laser photon (dotted line of Fig. lb).
KeywordsDetailed Balance Condition Bare Atom Collisional Relaxation Optical Bloch Equation Impact Regime
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