Polarization factors in the general case of three-wave diffraction.

The polarization properties of diffracted radiation depending on the geometry of three-wave configurations and spectral and polarization states of the incident radiation are considered on the basis of the representation of multiple diffraction geometry in the natural crystallographic coordinates. The analytical expressions, obtained earlier for the symmetric cases [Sheludko (2004). Acta Cryst. A60, 281-282], are extended for the general case of three-wave diffraction of radiation on single crystals. The problem of the description of conditions of inverse asymmetry of three-wave diffraction profiles is reduced to a classical analysis of quadratic and cubic equations.