Abstract

A simple modification of the known Maréchal intensity formula is proposed. It enables one to evaluate the near-the-diffraction-focus intensity distribution for well-corrected optical systems with small Fresnel numbers of the focusing geometry. As an example, the focal-shift effect in perfect systems is briefly reexamined.

© 1983 Optical Society of America

Three-dimensional intensity distribution near the focus in systems of different Fresnel numbers

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