Optical: systems and elements – Holographic system or element – For synthetically generating a hologram
Patent
1998-05-05
2000-09-12
Spyrou, Cassandra
Optical: systems and elements
Holographic system or element
For synthetically generating a hologram
359 15, 359566, 359569, 359599, 359900, G03H 108, G02B 532
Patent
active
061185590
ABSTRACT:
A broadband diffractive diffuser contains at least three levels, with approximately a phase shift of .pi. between at least two of the at least three levels. Such a diffuser provides light with more than two phasor vectors at the zero order. The presence of the more than two phasor vectors reduces the zero order diffraction efficiency at non-design wavelength, increasing the usefulness of the diffuser at wavelengths other than the design wavelength. Preferably, the diffractive diffuser includes a plurality of regions, approximately 50% of an area of the plurality of regions presenting a phase shift of .pi. at a design wavelength, approximately 25% of the area of the plurality of regions presenting a phase shift of 2.pi. at the design wavelength, and approximately 25% of the area of the plurality of regions presenting a phase shift of 0 at the design wavelength. Such a diffractive diffuser may be formed by logical operations between two diffractive diffuser patterns, by adding two diffractive diffuser patterns, or by pixel-by-pixel scanning.
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Fedor Adam S.
Johnson Eric G.
Kathman Alan D.
Morris, Jr. James E.
Digital Optics Corporation
Jr. John Juba
Morse Susan S.
Spyrou Cassandra
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