  We study the spectra of emission of a system composed by an atom, tightly
confined inside a high-finesse resonator, when the atom is driven by a laser
and is at steady state of the cooling dynamics induced by laser and cavity
field. In general, the spectrum of resonance fluorescence and the spectrum at
the cavity output contain complementary information about the dynamics
undergone by the system. In certain parameter regimes, quantum interference
effects between the scattering processes induced by cavity and laser field lead
to the selective suppression of features of the resonance fluorescence
spectrum, which are otherwise visible in the spectrum of laser-cooled atoms in
free space.
