16 November 1999 Geometrical optics of x-ray asymmetric Bragg reflection
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kenji Tamasaku, Tetsuya Ishikawa, "Geometrical optics of x-ray asymmetric Bragg reflection", Proc. SPIE 3773, X-Ray Optics Design, Performance, and Applications, (16 November 1999); doi: 10.1117/12.370093; https://doi.org/10.1117/12.370093
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