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Figure 6
Fraunhoffer diffraction pattern of a square aperture (a) and circular aperture (b) as calculated by the ffresnel2d post-processor. A coherent Monte Carlo source of 1024 rays of 1 nm wavelength was sent to illuminate the 4 µm-wide slit. The detector is placed 100 m downstream from the slit. The image on the detector is sampled by 128 × 128 pixels. The SHADOW results of averaging 64 runs (dotted line), from which standard deviations are calculated, have been compared with the analytic theoretical pattern (solid line) with excellent agreement.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 18| Part 5| September 2011| Pages 708-716
https://doi.org/10.1107/S0909049511026306
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