Abstract

A diffractive Alvarez lens is demonstrated that consists of two separate phase plates, each having complementary 16-level surface-relief profiles that contain cubic phase delays. Translation of these two components in the plane of the phase plates is shown to produce a variable astigmatic focus. Both spherical and cylindrical phase profiles are demonstrated with good accuracy, and the discrete surface-relief features are shown to cause less than $\lambda /10$ wave-front aberration in the transmitted wave front over a $40 \mathrm{mm}\times 80 \mathrm{mm}$ region.

© 2000 Optical Society of America

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