The factors affecting the polarization transformations of X-rays in Laue diffraction from crystals with dislocations

Abstract

The transformations of X-ray polarization with coherent σ-and π-components have been studied for the Laue diffraction from LiF crystals with a high dislocation density (10⁴–10⁵ mm⁻²). The dependence of the parameter characterizing the diffraction-induced birefringence and the degree of coherence of the transmitted beam on the squared reciprocal-lattice vector (H ² = 4sin²θ/λ²) is determined. It is shown that the parameter characterizing the diffraction-induced birefringence in crystals with dislocations is determined by the static Debye-Waller factor (exp(-L)) and the effective thickness Δ of the crystal. The exponent L increases and the parameter Δ decreases with the dislocation density.