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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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Patent
06 Aug 1987
TL;DR: In this paper, an achromatic lens with a corrector for reducing the secondary spectrum and a plane image field is presented. But the free diameter of the crystal lens in the corrector amounting to only 50% of the free diameters of the objective lens, is achieved by the system being constructed from two optical members, one lens of the correctedor consisting of BaF2 or SrF2 and being embedded between glass lenses.
Abstract: The invention relates to an achromatic lens with a corrector for reducing the secondary spectrum and can be used for achieving apochromatic, diffraction-limited correction and a plane image field. The aim of producing an apochromatic system with diffraction-limited representation, 100 mm diameter and 1000 mm focal length, the free diameter of the crystal lens in the corrector amounting to only 50% of the free diameter of the objective lens, is achieved by the system being constructed from two optical members, one lens of the corrector consisting of BaF2 or SrF2 and being embedded between glass lenses.

1 citations

Proceedings ArticleDOI
27 Aug 1999
TL;DR: In this paper, a study of aplanatic cemented doublets acromatized with normal glasses in the visible spectrum in order to answer some questions concerned with residual aberrations such as zonal spherical aberration and spherochromatism is presented.
Abstract: This paper presents a systematic study of aplanatic cemented doublets acromatized with normal glasses in the visible spectrum in order to answer some questions concerned with residual aberrations such as zonal spherical aberration, oblique spherical aberration, spherochromatism and secondary spectrum. Two of the questions concerned with these residual aberrations are: (1) is it possible to reduce even by a small amount any of these aberrations by selecting an appropriate pair of glasses, and (2) is there any advantage in having the crown in front of the flint when designing a doublet. To answer these questions a study is being carried out for a doublet with an aperture of 2.0 inches and a semi- field of view of 1 degrees. The doublets are designed for six f-numbers: f/5.6, f/4.0, f/2.8, f/2.6, f/1.8 and f/1.6 when the crown is in front of the flint. All solutions have the same thickness on axis for the flint and the same thickness on the edge for the crown. This analysis is also performed for a double having the flint in front of the crown. The results are presented and discussed.

1 citations

Patent
14 Apr 2020
TL;DR: In this paper, a compact orthoscopic lens is corrected for monochromatic and chromatic aberrations over wavelengths from 450 to 2450 nm with an angular FOV of 5.56° vertical and 66° horizontal.
Abstract: A compact orthoscopic lens is corrected for monochromatic and chromatic aberrations over wavelengths from 450 to 2450 nm with an angular FOV of 5.56° vertical and 66° horizontal. The 4.36″ effective focal length lens with f-number of 4 is compact measuring 5.2″ from the first optical surface to the image. The lens includes, in order from object to image, a first optical group having a negative optical power; a second optical group having a positive optical power and a third optical group having a negative optical power. The first optical group consists of two elements, the second optical group consists of three elements, one a doublet, and the third optical group consists of two elements. A physical aperture stop is positioned inside the second optical group. Powers of groups and elements, shapes, refractive indices, Abbe numbers and partial dispersions of glasses are selected so the lens is apochromatic and orthoscopic.

1 citations

Journal ArticleDOI
TL;DR: An algorithm for designing objectives with separated components for telescopic and collimation systems is described and it is confirmed that inexpensive, easy-to-manufacture glasses can be used to obtain apochromatic correction of the image.
Abstract: This paper describes an algorithm for designing objectives with separated components for telescopic and collimation systems. Combinations of various types of optical glasses are presented for objective–apochromats obtained using this algorithm. It is confirmed that inexpensive, easy-to-manufacture glasses can be used to obtain apochromatic correction of the image.

1 citations


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