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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, the problem of the best balancing of secondary spherical aberration (sixth-power aberration) in photographic lenses was investigated computationally with the help of modulation transfer functions (ct-functions).
Abstract: The problem of the best balancing of secondary spherical aberration (sixth-power aberration) in photographic lenses by controlled amounts of primary spherical aberration and defocusing is investigated computationally with the help of modulation transfer functions (ct-functions). Monochromats with 4, 6 and 12 wavelengths of sixth-power aberration are examined, each over a range of fine-corrections and of focal settings and each working at an arbitrary focal ratio F R 2. In each case the image is received on four different model emulsions and the image quality is evaluated in two different ways, namely by means of its photographic Strehl definition and by means of its photographic structural resolution. The aerial images are also considered. It appears that in images with four wavelengths of sixth-power aberration (the Rayleigh tolerance limit) the best image quality is obtained sufficiently well for practical purposes in an ‘edge-corrected’ system, that is to say one in which the balancing fourth-power abe...
Patent
25 Nov 2015
TL;DR: In this paper, a method of detecting an included angle between an optical axis and a mechanical axis of an optical lens was proposed, where a linear guide rail with a high-precision rotary table and an apochromatic microscope were used to detect the included angle.
Abstract: The invention discloses a method of detecting an included angle between an optical axis and a mechanical axis of an optical lens The method includes the steps: placing a target generator on a focal plane of a collimator, connecting a linear guide rail with a high-precision rotary table, placing a three dimensional adjusting rack and an apochromatic microscope on the linear guide rail, placing the above established devices on an optical path of an off-axis collimator, fixing a to-be-tested optical lens to the three dimensional adjusting rack, and tightly combining a flat mirror with the mechanical reference surface of the optical lens An included angle between an optical axis and a mechanical axis of an optical lens is detected through device adjustment The problems of determination and correction of the optical axis when the optical lens and a photoelectric device are assembled are solved Operation convenience is brought for operators
Patent
28 Sep 2016
TL;DR: In this article, a refractive afocal optical system for correction of the chromatic aberration of diffractive imaging elements, more particularly the refractive optic system with angular magnification for medium wavelength, was proposed.
Abstract: A refractive afocal optical system for correction of the chromatic aberration of diffractive imaging elements, more particularly the refractive afocal optical system (1) with angular magnification “ med for medium wavelength » med , for correction of the chromatic aberration of the diffractive imaging element (2), particularly for correction of the dispersion effects of the diffractive imaging element (2) of focal length f' diff,med and in combination with the diffractive optical element (2) for realization of an achromatic or apochromatic imaging system in the spectral band from the shortest wavelength » short to the longest wavelength » long , which includes m optical members (10, 20), wherein each of the optical members (10, 20) consists of a pair of refractive optical elements of focal lengths f' I,med , f' II,med , made from refractive optical materials, whose generalized Abbe numbers v I and v II are bound by the equation 1 v I ˆ’ 1 v II = ˆ’ » short ˆ’ » long » med f €² I , med mf €² diff , med , wherein the relative dispersion of all refractive optical materials used ranges from 0.49 to 0.51, and the focal length of the other member of the pair f' II,med is selected that the optical member is afocal for the medium wavelength » med . List of Reference Marks 1 optical system 2 diffractive imaging element 10 member I 11 lens I 12 lens II 20 member II 21 lens III 22 lens IV 101 surface I 102 surface II 103 surface III 104 surface IV 201 surface V 202 surface VI 203 surface VII 204 surface VIII
Journal ArticleDOI
TL;DR: In this paper, the refractor-objective apochromat was used to generate a chromatic error of longitudinal aberration that is only a small fraction of that of the progenitor refractor objective alone.
Abstract: After the more than six decades since D. D. Maksutov introduced his aplanatic, catadioptric camera with the meniscus corrector plate and spherical-mirror objective, the system and its variants are well familiar within the design community. But it would have achieved limited enthusiasm had it not been for the singlet corrector's propensity for achromatization, since no balancing aberration is available in the objective. However, the refractor-objective apochromat possesses balancing, chromatic residuals that may be coupled with a Maksutov-like corrector plate to provide improved correction for chromatic aberration. The combination may be further optimized to generate a chromatic error of longitudinal aberration that is only a small fraction of that of the progenitor refractor objective alone. Examples are provided with one and two corrector elements. Caveats are discussed.

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