title: Diffraction from a circular aperture: on-axis field strength.
abstract: A useful, analytical result for the on-axis field strength from a uniformly illuminated circular aperture is derived. Also, new calculations for circular apertures with tapered illuminations are presented.
authors.forename: R E
authors.initials: RE
authors.lastname: English
authors.forename: N
authors.initials: N
authors.lastname: George