Diffractive optical element and optical head using the same

Details Diffractive optical element and optical head using the same Diffractive optical element and optical head using the same

2006-01-17

2006-01-17

Chang, Audrey (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S566000, C369S112040, C369S109010, C369S044230, C369S103000

Reexamination Certificate

active

06987615

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 λ1satisfying the relationship: 0.35 μm≦λ1≦0.45 μm is incident and emits substantially first-order diffracted light when light with a second wavelength λ2satisfying the relationship: 0.6 μm≦λ2≦0.7 μm is incident.

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