Chock refraction of electromagnetic waves in absorbing crystals

The topological peculiarities of the wave surfaces self-intersection near the singular optical axes of the absorbing crystal are studied. The complex polarization fields distributions in the vicinity of the degenerated directions are identified. It is shown that the polarization ellipses rotation during the m wave normal passing round the optical axis is characterized by the Poincare index n = 1/4. The chock refraction of the electromagnetic waves on the line of the hollows intersection of the refraction indexes surface is forecasted and theoretically studied (by the rhombic crystal example). It is shown that the P-bar± energy average fluxes only in the central chock area are close by direction to the n± normals to the refraction surface, i.e. only there, where polarization is almost linear and the waves group velocity is well determined. The possibilities of the chock refraction observation are analyzed