Zone plates with cells apodized by Legendre profiles
- 20 March 1990
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 29 (9) , 1299-1303
- https://doi.org/10.1364/ao.29.001299
Abstract
By apodizing the cells of a zone plate and changing the opening ratio, it is possible to shape the relative power spectrum of its foci. We describe a novel procedure that leads to an analytical formula for shaping the focus power spectrum by using apodizers expressible as the Legendre series; these act on cells of arbitrary opening ratio. Our general result is used to design zone plates that have missing foci and to discuss a synthesis procedure using apodizers with various opening ratios. Our applications can also be used for shaping the power spectrum of 1-D gratings.Keywords
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