Abstract

Apodizers designed to increase focal depth have been conveniently interpreted as the Fourier spectra of certain objects, which then exhibit high focal depth. These objects were employed to create self-images with high focal depth.¹ Now we identify circular symmetrical objects that show low sensitivity to spherical aberration. Based on this interpretation, we propose zone plate profiles that will create self-images beyond the paraxial approximation.

© 1986 Optical Society of America