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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07 Mar 2001TL;DR: In this article, an apochromatic triplet can be designed without employing special glasses, and its spherochromatic aberration is determined and compared with that of a conventional glass triplet.
Abstract: In this paper, it has been shown an apochromatic triplet can be designed without employing special glasses. This possibility is offered when optical system is composed of two lenses, i.e., hybrid and glass ones. Such a system is proposed and its spherochromatic aberration is determined. Aberration characteristic of the system is compared with that of conventional glass apochromat.
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TL;DR: The analysis of the transform aberration shows that the even aberrations, e.g., spherical aberration and field curvature, do not degrade the cosine transform and need not be corrected, which permits us to design systems with good performance and uncomplicated lens structures.
Abstract: We describe the lens design for a twin-imaging white-light interferometer in which the interference pattern at the exit-pupil plane is the cosine transform of the spatial-intensity distribution of the object. The achromatic condition in terms of optical power is derived. The analysis of the transform aberration shows that the even aberrations, e.g., spherical aberration and field curvature, do not degrade the cosine transform and need not be corrected. This significant simplification permits us to design systems with good performance and uncomplicated lens structures. We present a lens design with three elements and a length of 320 mm. The system is capable of resolving more than 106 pixels with an operating spectral bandwidth of 100 nm. The results of an experiment with an early four-element design are also presented.
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03 Dec 2007TL;DR: In this article, a simple F-theta lens is introduced, whose image height is proportional to its field view angle through introducing reasonable barrel distortion so as to scan or mark linearly.
Abstract: The lens, whose image height is proportional to its field view angle through introducing reasonable barrel distortion so as to scan or mark linearly is called F-theta lens. Design of F-theta lens is introduced in the paper. The design idea and method are illustrated in detail through the analysis of two systems with working area of 200×200mm 2 and 500×500mm 2 . They're simple and compact. Both of them are composed of only three spherical lenses with two kinds of common optical glasses. Their tube length (from the front surface of the first lens to the back surface of the last one) is far less than 100mm. Remarkably, such simple lenses are able to obtain diffraction-limited focusing performances and low distortions less than 0.5 percent relative to F-Theta linear relation.
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