Abstract
We know that when a converging spherical wave is focused by an aberration-free system, the point of maximum intensity is not at the geometrical focus but lies closer to the exit pupil. It is apparent that the whole 3-D intensity distribution in the focal region is changed due to the shift of the intensity maximum from the geometrical focus to an ascertainable place in front of the exit pupil.1
© 1987 Optical Society of America
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