Optical: systems and elements – Diffraction – From zone plate
Patent
1997-07-08
1999-11-30
Spyrou, Cassandra
Optical: systems and elements
Diffraction
From zone plate
359566, 359580, 359576, 355 53, 355 67, G02B 530, G03B 2742
Patent
active
059952857
ABSTRACT:
A binary-type optical diffraction device having the excellent capability of antireflection includes a step structure by which lens elements of a Fresnel lens are approximated. The surface of the steps formed on a substrate is entirely covered with a thin film having a flat surface. The height of each step and the refractive index of the thin film are selected so that the antireflection conditions for the respective steps are satisfied and thus the intensity of the reflected light rays is minimized.
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Pawlowski, E, et al., "Antireflection-Coated Diffractive Optical Elements Fabricated By Thin-Film Deposition", Optical Engineering, vol. 33, No. 11, pp. 3537-3646 (Nov. 1994).
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Canon Kabushiki Kaisha
Jr. John Juba
Spyrou Cassandra
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