Scalar Wave Diffraction From A Circular Aperture
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Scalar Wave Diffraction from a Circular Aperture
The scalar wave theory is used to evaluate the expected diffraction patterns from a circular aperture. The standard far-field Kirchhoff approximation is compared to the exact result expressed in terms of oblate spheroidal harmonics. Deviations from an expanding spherical wave are calculated for circular aperture radius and the incident beam wavelength using suggested values for a recently proposed point diffractin interferometer. The Kirchhoff approximation is increasingly reliable in the far-field limit as the aperture radius is increased, although significant errors in amplitude and phase persist.
Selected Papers on Scalar Wave Diffraction
Author: Kurt Edmund Oughstun
language: en
Publisher: SPIE-International Society for Optical Engineering
Release Date: 1992