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We report the development of quantum microscopic theory of quasi-resonantdipole-dipole interaction in the ensembles of impurity atoms imbedded intotransparent dielectric and located into Fabry-Perot cavity. On the basis of thegeneral approach we study the simultaneous influence of the cavity and resonantdipole-dipole interaction on the shape of the line of atomic transition as wellas on light trapping in dense impurity ensembles. We analyze this influencedepending on the size of the ensemble, its density, as well as on r.m.s.deviation of the transition frequency shifts caused by the symmetry disturbanceof the internal fields of the dielectric medium. Obtained results are comparedwith the case when the cavity is absent. We show that the cavity canessentially modify cooperative polyatomic effects.

Light trapping in an ensemble of point-like impurity centers in Fabry-Perot cavity