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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Patent•
17 Jul 1990
TL;DR: A diffraction bifocal lens or lens system, comprising two profiled surfaces or interfaces or a linear combination thereof, wherein one profile provides for the bifocality of the lens and the other profile compensates for chromatic aberration, is described in this paper.
Abstract: A diffraction bifocal lens or lens system, comprising two profiled surfaces or interfaces or a linear combination thereof, wherein one profile provides for the bifocality of the lens and the other profile compensates for chromatic aberration. These lenses or lens systems exhibit two focal points, one which exhibits positive chromatic aberration and the other which exhibits negative chromatic aberration.
113 citations
TL;DR: Split beams of varying separations from a helium-neon laser were directed through the crystalline lenses of a number of vertebrates to indicate the extent to which the refractive index variation of the lens and lens shape control spherical aberration.
110 citations
TL;DR: Experimental results confirmed that this lens performed well over a 14-deg field of view, and a new airspaced system is described which avoids introducing unwanted transverse color.
Abstract: Optical systems for correcting the axial chromatic aberration of the eye are studied theoretically. Compact(cemented) doublets or triplets for this cannot avoid introducing unwanted transverse color. A new air-spaced system is described which avoids this problem. Experimental results confirmed that this lens performed well over a 14-deg field of view.
108 citations
Patent•
21 Sep 2001
TL;DR: In this article, the authors proposed multifocal ophthalmic lenses that have zones of more than one optical power, or focal length, correct for high order optical aberrations in more than a single field of gaze.
Abstract: The invention provides multifocal ophthalmic lenses that have zones of more than one optical power, or focal length. The lenses correct for high order optical aberrations in more than one field of gaze.
106 citations
TL;DR: A significant improvement of the linear contrast transfer can be demonstrated and this work might be useful to others in understanding the process of image formation in a Cc /Cs-corrected transmission electron microscope.
Abstract: For the transmission electron aberration-corrected microscope (TEAM) initiative of five U.S. Department of Energy laboratories in the United States, a correction system for the simultaneous compensation of the primary axial aberrations, the spherical aberration Cs, and the chromatic aberration Cc has been developed and successfully installed. The performance of the resulting Cc /Cs-corrected TEAM instrument has been investigated thoroughly. A significant improvement of the linear contrast transfer can be demonstrated. The information about the instrument one obtains using Young's fringe method is compared for uncorrected, Cs-corrected, and Cc /Cs-corrected instruments. The experimental results agree well with simulations. The conclusions might be useful to others in understanding the process of image formation in a Cc /Cs-corrected transmission electron microscope.
102 citations