Topic
Apochromat
About: Apochromat is a research topic. Over the lifetime, 642 publications have been published within this topic receiving 7934 citations.
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TL;DR: In this article, a method of designing lenses for minimum spherical aberration has been extended and applied to the design of thin-film waveguide lenses, with apertures up to f/3.
Abstract: A classical method of designing lenses for minimum spherical aberration has been extended and applied to the design of thin-film waveguide lenses. The multielement lenses, with apertures up to f/3, consist entirely of planar structures. Computed performance shows good resolution over a wide range of input angles.
19 citations
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TL;DR: In this paper, the third-order aberration coefficients for a thick lens in air were calculated and the dependence of individual aberration coefficient on a lens thickness was analyzed, making it possible to analyze an influence of the lens thickness on lens aberration properties and the replacement of a thick optical system by a thin lens model.
Abstract: In this paper, formulas are described for the calculation of the third-order aberration (Seidel) coefficients for a thick lens in air. The explicit analytic dependence of individual aberration coefficients on a lens thickness is presented. Such formulas make it possible to analyze an influence of the lens thickness on lens aberration properties and the replacement of a thick lens optical system by a thin lens model.
19 citations
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26 Nov 1997TL;DR: An F-theta scan lens for a dual beam, dual wavelength raster output scanning system (ROS) has four lens elements with the third and fourth lenses forming a doublet having a negative refractive power as discussed by the authors.
Abstract: An F-theta scan lens for a dual beam, dual wavelength raster output scanning system (ROS) has four lens elements with the third and fourth lenses forming a doublet having a negative refractive power. This four-element F-theta scan lens corrects for axial chromatic aberration and lateral chromatic aberration for both wavelengths and provides scan linearity.
19 citations
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04 Jun 2010TL;DR: In this article, an ophthalmic lens includes an optical filter operable to filter out at least visible light having a wavelength less than 450 nm, and a first diffractive structure adapted to produce a focus for visible light in a first wavelength range above 550 nm and to reduce longitudinal chromatic aberration to less than one diopter for incoming visible light.
Abstract: An ophthalmic lens includes an optical filter operable to filter out at least visible light having a wavelength less than 450 nm. The lens also includes a first diffractive structure adapted to produce a focus for visible light in a first wavelength range above 550 nm and to reduce longitudinal chromatic aberration to less than one diopter for incoming visible light in the first wavelength range. The lens also includes a second diffractive structure outside the first diffractive structure in a radial direction and adapted to produce a focus for visible light in a second wavelength range between 450 nm and 550 nm. The second diffractive structure is also adapted to reduce longitudinal chromatic aberration for incoming visible light in the second wavelength range to less than one diopter while allowing longitudinal chromatic aberration in the first wavelength range in an amount greater than the first diffractive structure.
18 citations
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TL;DR: Closed-form solutions are provided that show that the focal length of the lens is dependent on the presence of defocus, x-astigmatism, and spherical aberration and are applicable to Gaussian beams in the absence of arbitrary-sized apertures.
Abstract: We outline an approach for the calculation of the mean focal length of an aberrated lens and provide closed-form solutions that show that the focal length of the lens is dependent on the presence of defocus, x-astigmatism, and spherical aberration. The results are applicable to Gaussian beams in the presence of arbitrary-sized apertures. The theoretical results are confirmed experimentally, showing excellent agreement. As the final results are in algebraic form, the theory may readily be applied in the laboratory if the aberration coefficients of the lens are known.
18 citations