Abstract

Effects of spherical aberrations in converging and diverging lens–axicon doublets are investigated. Intensity profiles are obtained in the line and ring focal regions by numerically solving the Fresnel–Kirchhoff integral. Comparisons with aberration-free computations show that higher peak irradiances occur for the converging doublet when spherical aberrations are included. Results are presented for axicons with small apex angles in lens–axicon combinations illuminated by collimated Gaussian 1.064-µm laser beams.

© 1997 Optical Society of America

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