Optical system and method of designing optical system
First Claim
1. An optical system comprising:
- a refractive optical element; and
a diffractive optical element,wherein a diffractive portion of said diffraction optical element corrects a chromatic aberration flare component of wavelengths other than a predetermined wavelength remaining in said refractive optical element by means of an aspherical component given by a grating pitch of a diffraction grating that constitutes said diffractive portion, and a refractive portion of said diffractive optical element has a shape so as to correct an aberration component as a composite of an aberration component of said predetermined wavelength of said diffractive optical element shifted by the aforementioned correction and an aberration component of said predetermined wavelength of said refractive optical element.
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Abstract
An optical system includes a diffractive optical element and a refractive optical element. The diffractive optical element corrects a chromatic aberration flare component of wavelengths other than a predetermined wavelength (a design wavelength) remaining in the refractive optical element by means of an aspherical component given by the grating pitch of a diffraction grating included in a diffractive portion of the diffractive optical element. In addition, a refractive portion of the diffractive optical element is adapted to correct an aberration component as a composite of the aberration component of the design standard wavelength shifted by the correction and the aberration component of the design standard wavelength of the refractive optical element.
9 Citations
5 Claims
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1. An optical system comprising:
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a refractive optical element; and a diffractive optical element, wherein a diffractive portion of said diffraction optical element corrects a chromatic aberration flare component of wavelengths other than a predetermined wavelength remaining in said refractive optical element by means of an aspherical component given by a grating pitch of a diffraction grating that constitutes said diffractive portion, and a refractive portion of said diffractive optical element has a shape so as to correct an aberration component as a composite of an aberration component of said predetermined wavelength of said diffractive optical element shifted by the aforementioned correction and an aberration component of said predetermined wavelength of said refractive optical element. - View Dependent Claims (2, 3, 4)
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5. A method of designing an optical system having a refractive optical element and a diffractive optical element comprising:
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a first step to correct a chromatic aberration flare component of wavelengths other than a predetermined wavelength remaining in said refractive optical element by means of an aspherical component given by a grating pitch of a diffraction grating that constitutes a diffractive portion of said diffractive optical element; and a second step to correct an aberration component as a composite of an aberration component of said predetermined wavelength shifted by the correction of said first step and an aberration component of said predetermined wavelength of said refractive optical element by means of a refractive portion of said diffractive optical element.
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Specification