  A quantum model of Bose-Einstein condensation based on processes involving
polaritons excited in an intracavity absorbing cell with resonance atoms, which
is manifested in the spectral characteristics of the system, is considered. It
is shown that the spectral 'condensation' appears which is directly related to
the degeneracy of a weakly interacting gas of polaritons resulting in
quasi-condensation at room temperature. The possibility of obtaining polariton
condensation as a new phase state by using the confinement of polaritons in an
atomic optical harmonic trap is discussed.
