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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.
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TL;DR: In this paper, an incoherent method for aberration measurement of micro cylindrical lenses is presented, where the aberration is retrieved from the intensity distribution of a light beam passing through the sample and the accuracy and the spatial resolution of the measurement are discussed.
07 Jan 2015
TL;DR: In this paper, possible solutions to problems related to polishing aspherical lenses applying CNC technology and to spherical lenses applying classical technology are discussed, by combining various conditions it is possible to achieve required roughness an d shape of the lens surface.
Abstract: Chromatic distortion represents a limit parameter for many optical systems. For telescope objectives low chromatic aberration is especially importa nt. The choice of appropriate materials is therefore crucial for the production of optical elements. The S-FPL-53 glass produced by Ohara Corporation is a re adily available material with low dispersion. Its high Abbe number indicates low achromatism, therefore it is used in all the above-mentioned designs to achieve good correction. On the other hand, this fluorite glass is quite soft and has a high thermal expansion coefficient, so it is really difficult to polish. In this paper possible solutions to problems related to polishing aspherical lenses applying CNC technology and to polishing spherical lenses applying cl assical technology are discussed. By combining various conditions it is possible to achieve required roughness an d shape of the lens surface. Keywords: polishing, asphere, S-FPL-53, aspherical surface 1. INTRODUCTION
TL;DR: Spherical and chromatic aberration as functions of lens magnification have been computed for an immersion lens with a ''bell-shaped'' axial field distribution as mentioned in this paper, and the results show that the aberration is proportional to the diameter of the lens.
Abstract: Spherical and chromatic aberration as functions of lens magnification have been computed for an immersion lens with a ``bell‐shaped'' axial field distribution.
Patent•
13 Mar 2008TL;DR: In this paper, the authors propose an aberration correcting structure enabling both a long-focus aberration correction function and a short-focus correction function by using a conventional aberration corrector structure disposing two rotation-symmetry lenses between two multi-pole lenses.
Abstract: PROBLEM TO BE SOLVED: To provide an aberration correcting structure enabling both a long-focus aberration correcting function and a short-focus aberration correcting function. SOLUTION: By using a conventional aberration corrector structure disposing two rotation-symmetry lenses between two multi-pole lenses, this aberration corrector disposes three rotation symmetry lenses between an objective lens and the multi-pole lens instead of the conventional arrangement in which two rotationally symmetric lenses are disposed therebetween. When the focal length of the objective lens is long, a set of two of the three rotation symmetry lenses disposed between the objective lens and the multi-pole lens is used for correction of aberration. Further, when the focal length of the objective lens is short for high resolution observation, etc, another set of two of the three rotation symmetry lenses disposed between the objective lens and the multi-pole lens which is different from the set of two rotation symmetry lenses used for longer focal length is used for correction of aberration. COPYRIGHT: (C)2010,JPO&INPIT
TL;DR: In this article, the relations between aberration coefficients for different object position have been obtained in electron optics either by direct use of the eikonal or by examining the aberration integrals.