Abstract

A new phase zone plate with suppressed higher-order flux is proposed and optimum design calculations are made for Al. While the first-order collecting efficiency is equal to that of conventional Fresnel zone plates (∼10%), the ratio of the higher-order flux energy to the first-order energy can be suppressed to <10−3–10−6 in the 300–600-Å wavelength range.

© 1985 Optical Society of America

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