Dressed atom approach to collisional redistribution

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Abstract
The dressed atom approach to resonance fluorescence is extended to include collisional effects. These effects appear as a collision induced modification of the radiative cascade of the dressed atom. All the characteristics of absorption and emission spectra are expressed in terms of the T1 and T2 type relaxation parameters of the dressed atom. The domain of validity of this approach is investigated and is shown to be larger than that of the optical Bloch equations. The relaxation parameters are related to the collision S matrix. By using a spin representation, they are also expressed in terms of the Fourier transform of some correlation function of the collisional perturbation