Comparison of Quasi-Isotropic Approximations of the Coupling Ray Theory with the Exact Solution in the 1-D Anisotropic “Oblique Twisted Crystal” Model

Abstract

The coupling ray theory bridges the gap between the isotropic and anisotropic ray theories, and is considerably more accurate than the anisotropic ray theory. The coupling ray theory is often approximated by various quasi-isotropic approximations.