DIFFRACTIVE OPTICAL ELEMENT AND METHOD OF MANUFACTURE OF THE SAME
First Claim
1. A diffractive optical element having plural diffraction grating surfaces accumulated, characterized in that:
- 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
that 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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Accused Products
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.
44 Citations
14 Claims
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1. A diffractive optical element having plural diffraction grating surfaces accumulated,
characterized in that: - 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
that 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. - View Dependent Claims (5, 6, 9, 10, 13, 14)
- 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
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2. A diffractive optical element having plural diffraction grating surfaces accumulated,
characterized In that: - a pair of diffraction grating surfaces are positioned so that a protrusion and/or a recess formed outside an optically effective region of one diffraction grating surface engages with a recess and/or a protrusion formed outside an optically effective region of the other diffraction grating surface; and
that 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 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 each of plural wavelengths becomes equal to a multiple, by an integral number, of the wavelength.
- a pair of diffraction grating surfaces are positioned so that a protrusion and/or a recess formed outside an optically effective region of one diffraction grating surface engages with a recess and/or a protrusion formed outside an optically effective region of the other diffraction grating surface; and
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3. A diffractive optical element having plural diffraction grating surfaces accumulated,
characterized in that: - 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
that 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 close to it, such that a diffraction efficiency of diffraction light of a particular order, such as one of positive and negative first order, with respect to plural wavelengths, becomes equal to or nearly equal to 100%.
- 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
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4. A diffractive optical element having plural diffraction grating surfaces accumulated,
characterized in that: - a pair of diffraction grating surfaces are positioned so that a protrusion and/or a recess formed outside an optically effective region of one diffraction grating surface engages with a recess and/or a protrusion formed outside an optically effective region of the other diffraction grating surface; and
that 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 close to it, such that a diffraction efficiency of diffraction light of a particular order, such as one of positive and negative first order, with respect to plural wavelengths, becomes equal to or nearly equal to 100%.
- a pair of diffraction grating surfaces are positioned so that a protrusion and/or a recess formed outside an optically effective region of one diffraction grating surface engages with a recess and/or a protrusion formed outside an optically effective region of the other diffraction grating surface; and
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7. A diffractive optical element having plural diffraction grating surfaces accumulated,
characterized in that: - a pair of diffraction grating surfaces are mutually positioned so that a protrusion, and/or a recess having a sectional shape of one of a triangular shape, a trapezoidal shape, and a semi-circular shape, formed on one diffraction grating surface, engages with a recess and/or a protrusion having a sectional shape of one of a triangular shape, a trapezoidal shape, and a semi-circular shape, formed on the other diffraction grating surface.
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8. A diffractive optical element having plural diffraction grating surfaces accumulated,
characterized in that: - a pair of diffraction grating surfaces are mutually positioned so that a protrusion and/or a recess having a sectional shape of one of a triangular shape, a trapezoidal shape, and a semi-circular shape, formed outside an optically effective region of one diffraction grating surface engages with a recess and/or a protrusion having a sectional shape of one of a triangular shape, a trapezoidal shape, and a semi-circular shape, formed outside an optically effective region of the other diffraction grating surfaces.
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11. A method of manufacturing a diffractive optical element, comprising the steps of:
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forming, upon a substrate, a first diffraction grating and a recess and/or a protrusion;
preparing a mold having a protrusion and/or a recess to be engaged with the recess and/or the protrusion formed on the substrate, as well as a second diffraction grating pattern; and
positioning the diffraction grating on the substrate and the diffraction grating pattern with each other by engaging the recess and/or the protrusion of the substrate with the protrusion and/or the recess of the mold. - View Dependent Claims (12)
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Specification