Abstract
Diffraction of a Gaussian beam passing through a circular aperture subsequently focused by a lens is investigated. An expression is derived for the amplitude distribution beyond the lens. With the aid of the axial intensity and encircled energy, the effect of the aperture-lens separation on the focal shift is obtained, and the quantitative influence of the truncation parameter and Fresnel number on the focal shift is also presented.
© 2019 Optical Society of America
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