Constant-axial-intensity nondiffracting beam

Opt Lett. 1992 Feb 15;17(4):232-4. doi: 10.1364/ol.17.000232.

Abstract

Numerical solutions of the Fresnel diffraction integral with various apodizing filter functions are used to indicate that a so-called nondiffracting beam can be produced that maintains a constant spot size and constant axial intensity over a considerable range, approximately 30 m in our example.