Diffractive multifocal optical device

Optical: systems and elements – Diffraction – From zone plate

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351161, 359569, 359571, 623 6, G02B 2744, G02C 704, A61F 216

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active

051444836

ABSTRACT:
A bifocal lens of the Cohen lens design utilizing phase zone plate optics and a facet depth of one-half wavelength of the design wavelength, where the primary focal points are at two orders, specifically the 0.sup.th and 1.sup.st orders, and the brightness at each primary focal point is equal at about 0.40.

REFERENCES:
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patent: 4210391 (1980-07-01), Cohen
patent: 4338005 (1982-07-01), Cohen
patent: 4340283 (1982-07-01), Cohen
patent: 4637697 (1987-01-01), Freeman
patent: 4641934 (1987-02-01), Freeman
patent: 4642112 (1987-02-01), Freeman
patent: 4881804 (1989-11-01), Cohen
patent: 4881805 (1989-11-01), Cohen
patent: 4995714 (1991-02-01), Cohen
patent: 4995715 (1991-02-01), Cohen
patent: 5056908 (1991-10-01), Cohen
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