Methods of defining circular off-axis aspheric mirrors

Jeong-Yeol Han; Sukmock Lee

doi:10.1117/1.JATIS.4.4.044002

19 October 2018 Methods of defining circular off-axis aspheric mirrors

Jeong-Yeol Han, Sukmock Lee

Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, Issue 4, 044002 (October 2018). https://doi.org/10.1117/1.JATIS.4.4.044002

Abstract

We investigated the definition for circular off-axis aspheric mirrors (COAMs). The clear opening of the COAM obtained by projecting a circular aperture on the aspheric surface does not form a plane but a curved surface. To solve this problem, we propose to use a plane to cut the aspheric surface to obtain a COAM. The COAM has three characteristics: (i) an elliptical opening; (ii) the major axis of the opening lies on the meridional plane containing the original optical axis of the aspheric surface and the minor axis lies on the sagittal plane perpendicular to the meridian plane; and (iii) it is not deepest at the center of the ellipse. The third characteristic suggests two methods for defining the COAM using a plane: (i) with the center of the elliptical opening as a reference and (ii) with the deepest point of the mirror as a reference. All the formulas required to obtain the desired COAM using the two methods are presented.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Jeong-Yeol Han and Sukmock Lee "Methods of defining circular off-axis aspheric mirrors," Journal of Astronomical Telescopes, Instruments, and Systems 4(4), 044002 (19 October 2018). https://doi.org/10.1117/1.JATIS.4.4.044002

Received: 1 June 2018; Accepted: 26 September 2018; Published: 19 October 2018

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KEYWORDS

Mirrors

Aspheric lenses

Aspheric optics

James Webb Space Telescope

Mirror pointing

Telescopes

Solids

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