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By means of quantum stochastic calculus we construct a model for an atom withtwo degenerate levels and stimulated by a laser and we compute its fluorescencespectrum; let us stress that, once the model for the unitary atom-fielddynamics has been given, then the spectrum is computed without furtherapproximations. If only the absorption/emission term is included in theinteraction, we reobtain the Mollow spectrum in the case of a monochromaticlaser and the Kimble-Mandel spectrum in the case of a "phase diffusion model"for a non monochromatic laser. However, our model can describe also anothertype of light scattering, a "direct scattering" due to the response of the atomas a whole, which we expect to be small, but which interferes with thescattering due to the absorption/emission channel. When both the scatteringchannels are introduced we obtain a modification of the Mollow-Kimble-Mandelspectrum, which shares the main features with the usual case, but whichpresents some asymmetries even in the case of no detuning.Comment: 17 pages, Latex, 4 figure

A quantum stochastic approach to the spectrum of a two-level atom