Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2005-01-04
2005-01-04
Assaf, Fayez (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S569000, C359S571000, C359S576000
Reexamination Certificate
active
06839173
ABSTRACT:
A reflection type diffraction grating according to the present invention has a structure in which a metal film as a first layer with reflectance not lower than 30% with respect to the wavelength of incident light and a transparent dielectric film as a second layer are laminated successively on the surface of the reflection type diffraction grating. With respect to the wavelength of incident light, the metal film has a refractive index selected to be not higher than 1.5 and an extinction coefficient selected to be not smaller than 6.0. The transparent dielectric film has a refractive index selected to be in a range of from 1.30 to 1.46, both inclusively, with respect to the wavelength of incident light and has an optical film thickness selected to be in a range of from 0.20λ to 0.38λ, both inclusively, when λ is the wavelength of incident light.
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Kawamoto Shinji
Kunisada Terufusa
Nakama Kenichi
Shimmo Katsuhide
Assaf Fayez
Nippon Sheet Glass Co. Ltd.
Whitham Curtis & Christofferson, P.C.
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