Diffractive optical element and optical system including the same
First Claim
1. An optical system for use in a predetermined wavelength range, said optical system comprising:
- at least one diffractive optical element having a given wavelength dependency of diffraction efficiency so as to have a first spectral transmittance; and
at least one optical element having a second spectral transmittance characteristics which, together with said first spectral transmittance, provides a desired overall spectral transmittance which is flatter over said predetermined wavelength range than either said first spectral transmittance or said second spectral transmittance.
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Abstract
An optical system for use in a relatively wide wavelength range including a plurality of diffractive optical elements whose diffraction efficiencies are optimized for different wavelengths within said predetermined wavelength range. A diffractive optical element for use in a wide wavelength range includes a light transmissive substrate having a plurality of surface regions and a plurality of surface relief diffractive gratings are formed in said surface regions such that diffraction efficiencies of these gratings are optimized for different wavelengths within said predetermined wavelength range. A diffractive optical element is formed by a single optical element having a light transmissive substrate which reveals a given spectral transmittance and a surface relief diffractive grating formed in a surface of said substrate such that a wavelength dependency of said grating provides a desired spectral transmittance together with said spectral transmittance of the substrate.
52 Citations
7 Claims
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1. An optical system for use in a predetermined wavelength range, said optical system comprising:
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at least one diffractive optical element having a given wavelength dependency of diffraction efficiency so as to have a first spectral transmittance; and at least one optical element having a second spectral transmittance characteristics which, together with said first spectral transmittance, provides a desired overall spectral transmittance which is flatter over said predetermined wavelength range than either said first spectral transmittance or said second spectral transmittance. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification