  Additional high-frequency components of the pulsar radiation in Crab Nebula
are considered as a result of the resonance with the surface electromagnetic
wave at nonlinear reflection from of the neutron star surface.This stimulated
scattering consists in generation of a surface periodic relief by an incident
field and diffraction on that relief the radiation of relativistic positrons,
which fly from the magnetosphere to the star in the accelerating electric field
of a polar gap.
