Local field effects and multimode stimulated light scattering in a   two-level medium
  Scattering of a short (much shorter then the spontaneous lifetime) laser pulse has been considered in a dense resonant medium subject to local field effects. The system was studied in the limit of Hartree-Fock approximation for Bogolubov-Born-Green-Kirkwood-Yvon (BBGKY) hierarchy of equations for reduced density operators. A closed set of equations for atomic and field density operators was derived to describe stimulated scattering of radiation. Numerically as well as theoretically the capability of multicomponent spectrum with maximums multiple to Rabi frequency has been demonstrated. Relative line intensities in the spectrum were found in the limit of low density. 
Vl. K. Roerich, A. A. Panteleev, M. G. Gladush