Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2007-09-11
2007-09-11
Chang, Audrey Y. (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S566000, C369S112030, C369S109010, C369S044230, C369S103000
Reexamination Certificate
active
11049232
ABSTRACT:
A diffractive optical element emits substantially zero order diffracted light when light with a wavelength of 0.35 μm to 0.45 μm is incident and emits substantially first-order diffracted light when light with a wavelength of 0.6 μm to 0.7 μm is incident. The diffractive optical element includes a substrate and a grating portion formed on the substrate. The grating portion has a step-wise cross section with any one of levels selected from four levels, five levels and six levels. The diffractive optical element emits substantially zero-order diffracted light when light with a first wavelength λ1 satisfying the relationship: 0.35 μm≦λ1≦0.45 μm is incident and emits substantially first-order diffracted light when light with a second wavelength λ2 satisfying the relationship: 0.6 μm≦λ2≦0.7 μm is incident.
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Nishino Seiji
Shiono Teruhiro
Wada Hidenori
Chang Audrey Y.
Hamre Schumann Mueller & Larson P.C.
Matsushita Electric - Industrial Co., Ltd.
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