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Evaluation of the focusing performance of bent Laue crystals using wave‐optical theory
Author(s) -
Nesterets Ya. I.,
Wilkins S. W.
Publication year - 2008
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889808000617
Subject(s) - bent molecular geometry , formalism (music) , optics , diffraction , geometrical optics , physics , fresnel diffraction , crystal (programming language) , materials science , computer science , art , musical , visual arts , composite material , programming language
Quantitative analysis of the focusing performance of bent Laue crystals is carried out using the rigorous wave‐optical formalism. Via numerical solution of the Takagi equations and the Fresnel integral, the influence of diffraction on the formation of the image of an X‐ray source is analysed. The results are compared with those obtained using a formalism based on the geometrical optics approximation and significant differences are found. A formula for the geometrical aberration of a cylindrically bent crystal is derived. The effect of the aberration on image formation is analysed.