Optical transparency modes in anisotropic media
  The modes of nonlinear propagation of the two-component electromagnetic pulses through optically uniaxial media containing resonant particles are studied. The features of their manifestation in the "dense" media and in the media with expressed positive and negative birefringences are discussed. It is shown that exponentially and rationally decreasing solutions of the system of material and wave equations allow us also to describe the propagation of the self-induced transparency pulses in isotropic media in the case, when the direct electric dipole-dipole interaction between the resonant particles is taken into account. 
S. V. Sazonov, N. V. Ustinov