Effective Fresnel-number concept for evaluating the relative focal shift in focused beams
- 1 February 1998
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America A
- Vol. 15 (2) , 449-455
- https://doi.org/10.1364/josaa.15.000449
Abstract
We report on an analytical formulation, based on the concept of effective Fresnel number, to evaluate in a simple way the relative focal shift of rotationally nonsymmetric scalar fields that have geometrical focus and moderate Fresnel number. To illustrate our approach, certain previously known results and also some new focusing setups are analytically examined.Keywords
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