Diffractive optical element and method of manufacture of the same
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Abstract
A diffractive optical element having plural diffraction grating surfaces accumulated, wherein a pair of diffraction grating surfaces are positioned so that a protrusion and/or a recess formed on an outside of one diffraction grating surface engages with a recess and/or a protrusion formed on an outside of the other diffraction grating surface, and wherein the pair of diffraction grating surfaces are defined on materials having different refractive indices and different dispersions and being formed into a kinoform, or a shape and a height of blazed or binary, close to it, such that a largest optical path difference to be applied to light rays passing through the diffraction grating surfaces with respect to plural wavelengths becomes equal to a multiple, by an integral number, of the wavelength.
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Citations
18 Claims
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1-14. -14. (canceled)
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15. A diffractive optical element, comprising by a diffraction grating portion which includes first and second transparent diffraction gratings, wherein the first transparent diffraction grating, a first alignment pattern and a first contact portion are integrally formed on a first substrate by molding, and wherein the second transparent diffraction grating, a second alignment pattern and a second contact portion are integrally formed on a second substrate by molding,
wherein the first and second transparent diffraction gratings are disposed opposed to each other and accumulated with an air space of a predetermined distance defined by superimposing the first and second contact portions with each other, and wherein the first alignment pattern engages with the second alignment pattern.
Specification