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Proceedings Paper

Geometrical optics of x-ray asymmetric Bragg reflection
Author(s): Kenji Tamasaku; Tetsuya Ishikawa
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Paper Abstract

We present geometrical analysis on optics of x-ray asymmetric reflection in Bragg geometry. For a monochromatic light case, ignoring higher order terms of small deviations from the optical axis introduces Gaussian optics to asymmetric reflection, which is consistent with the conventional picture. It is, however, found that asymmetric reflection has large wave aberration and the wavefront does not transform as expected from Gaussian optics. A complex coherence factor is calculated numerically for Young's interference experiment, revealing the spatial coherence after asymmetric reflection can be explained by introducing an effective distance between the virtual source and the observing point. When x-rays have a finite wavelength spread, chromatic aberration emerges under Gaussian optics and prevents a sharp imaging. Multiple asymmetric reflections might cancel lateral chromatic aberration.

Paper Details

Date Published: 16 November 1999
PDF: 9 pages
Proc. SPIE 3773, X-Ray Optics Design, Performance, and Applications, (16 November 1999); doi: 10.1117/12.370093
Show Author Affiliations
Kenji Tamasaku, RIKEN--The Institute of Physical and Chemical Research (Japan)
Tetsuya Ishikawa, RIKEN--The Institute of Physical and Chemical Research (Japan)

Published in SPIE Proceedings Vol. 3773:
X-Ray Optics Design, Performance, and Applications
Ali M. Khounsary; Andreas K. Freund; Tetsuya Ishikawa; George Srajer; Jonathan C. Lang, Editor(s)

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