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Apochromat

About: Apochromat is a research topic. Over the lifetime, 642 publications have been published within this topic receiving 7934 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a diffractive optical element (DOE) was used to correct the axial chromatic aberration in the 8- to 10-mm IR wavelength of the FLIR system.
Abstract: We realize for the first time a forward-looking IR (FLIR) sys- tem using a diffractive optical element (DOE) in its optics made of ger- manium in the 8- to 10-mm IR wavelength. We describe the design and the performance of the DOE optics. The IR diffractive lens made of ger- manium is proposed to correct the axial chromatic aberration in optics of the FLIR system. Compared with conventional optics of an FLIR system the optics using a DOE singlet instead of ZnSe achromat, we have a DOE system modulation transfer function (MTF) that is almost equal to the conventional one. The DOE singlet instead of ZnSe achromat ap- pears to be enough to compensate for the chromatic aberration of the optical system. Using the DOE system, the numbers of lens elements, the mass, and the cost are reduced. © 2002 Society of Photo-Optical Instrumen- tation Engineers. (DOI: 10.1117/1.1487365)

16 citations

Patent
28 Aug 1996
TL;DR: An objective lens system comprising at least one diffractive optical element, having a high magnification and a large numerical aperture, and capable of favorably correcting aberrations, in particular, longitudinal chromatic aberration and lateral chromatic abnormality as discussed by the authors.
Abstract: An objective lens system comprising at least one diffractive optical element, having a high magnification and a large numerical aperture, and capable of favorably correcting aberrations, in particular, longitudinal chromatic aberration and lateral chromatic aberration.

16 citations

01 Jan 1989
TL;DR: It is suggested that good forms for intraocular lenses range from plano-convex (curved surface facing cornea) to equi-convesx, with the more curved surface facing the cornea.
Abstract: The effect of intraocular lens shape on off-axis performance of model pseudophakic eyes was investigated. Image quality criteria included an optimization procedure, spot diagrams, and the modulation transfer function (MTF). The optimum lens shape varies with lens fitting position, corneal asphericity, and pupil size. An earlier investigation showed that the optimum lens shape for on-axis imagery is approximately plano-convex, with the more cured surface facing the cornea. In this investigation, optimum lens shapes for a 10° off-axis position ranged from near this shape to near the reversed shape, i.e., the more curved surface facing the retina. Because the on-axis case should carry more weight and because conditions favoring the reverse form include small pupils for which image quality is fairly insensitive to variations in lens shape, it is suggested that good forms for intraocular lenses range from plano-convex (curved surface facing cornea) to equi-convex.

16 citations

Journal ArticleDOI
TL;DR: The test results verify the generation of field curvature and longitudinal chromatic aberration in a family of diffractive lenses.
Abstract: The optical characteristics of a family of diffractive lenses, called staircase lenses, are discussed. These lenses contribute no optical power and the fourth-order wave aberrations Petzval field curvature, distortion, and chromatic aberrations when collimated illumination is used. A diamond-turned staircase lens comprising 150 steps was manufactured. The test results verify the generation of field curvature and longitudinal chromatic aberration.

16 citations

Patent
07 May 1990
TL;DR: In this paper, a family of achromatic lens triplets and an apochromatic lens triplet are described, each of which consists of a fluidal liquid lens element (viz, Cargille 550206 liquid) contained between a Schott BK 7 glass lens element and Schott F2 glass element.
Abstract: A family of achromatic lens triplets and an apochromatic lens triplet are described, each of which consists of a fluidal liquid lens element (viz, Cargille 550206 liquid) contained between a Schott BK 7 glass lens element and a Schott F2 glass lens element

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20214
20204
20196
20188
201716
201625