Optical: systems and elements – Diffraction – From zone plate
Patent
1991-04-09
1993-10-26
Arnold, Bruce Y.
Optical: systems and elements
Diffraction
From zone plate
359576, 359589, G02B 518
Patent
active
052571327
ABSTRACT:
A broadband diffractive lens or imaging element produces a sharp focus and/or a high resolution image with broad bandwidth illuminating radiation. The diffractive lens is sectored or segmented into regions, each of which focuses or images a distinct narrowband of radiation but all of which have a common focal length. Alternatively, a serial stack of minus filters, each with a diffraction pattern which focuses or images a distinct narrowband of radiation but all of which have a common focal length, is used. The two approaches can be combined. Multifocal broadband diffractive elements can also be formed. Thin film embodiments are described.
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Ceglio Natale M.
Hawryluk Andrew M.
London Richard A.
Seppala Lynn G.
Arnold Bruce Y.
Gaither Roger S.
Moser William R.
Ryan J. P.
Sartorio Henry P.
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