Multifocal diffractive lens generating several fixed foci at different design wavelengths

Leonid L. Doskolovich, Evgeni A. Bezus, Andrey A. Morozov, Vladimir Osipov, James S. Wolffsohn & Boris Chichkov
We propose a method for designing multifocal diffractive lenses generating prescribed sets of foci with fixed positions at several different wavelengths. The method is based on minimizing the difference between the complex amplitudes of the beams generated by the lens microrelief at the design wavelengths, and the functions of the complex transmission of multifocal lenses calculated for these wavelengths. As an example, a zone plate generating three fixed foci at three different wavelengths was designed,...
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