Abstract

The influence that Seidel spherical aberration has on the irradiance distribution along the optical axis, or the Strehl ratio versus defocus, is expressed in terms of a differential operator. This permits us to describe separately the following two effects: a focal shift and a shape variation. We analyze two annular apodizers that reduce the shape variation of the Strehl ratio versus defocus.

© 1988 Optical Society of America

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