Diffractive optical element and optical system having the same

Details Diffractive optical element and optical system having the same Diffractive optical element and optical system having the same

2005-03-29

2005-03-29

Boutsikaris, Leo (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S565000, C359S569000, C359S570000, C359S571000, C359S575000, C359S576000

Reexamination Certificate

active

06873463

ABSTRACT:
Disclosed is a diffractive optical element which is made of at least two materials of different dispersions and which includes at least two diffraction gratings being accumulated one upon another, wherein each diffraction grating is formed on a curved surface of a substrate, and wherein a diffraction grating, of the at least two diffraction gratings, in which a curvature radius of the curved surface and a curvature radius of a grating surface in a portion where a grating pitch is largest, have different signs, is one of the at least two diffraction gratings which has a smallest grating thickness.

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