Title

Balancing detector effects with aberrations in the design of wide-field grazing incidence x-ray telescopes

Authors

Authors

J. E. Harvey; M. Atanassova;A. Krywonos

Comments

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Abbreviated Journal Title

Opt. Eng.

Keywords

detector effects; wide-field imaging systems; grazing incidence x-ray; telescopes; I TELESCOPE; SYSTEMS; ASTRONOMY; Optics

Abstract

Most imaging systems today include a mosaic detector array in the focal plane. Optical designers of astronomical telescopes typically produce a design that yields a superb on-axis aerial image in the focal plane, and detector effects are included only in the analysis of the final system performance. Aplanatic optical designs (corrected for spherical aberration and coma) are widely considered to be superior to nonaplanatic designs. However, there is little merit in an aplanatic design for wide-field applications because one needs to optimize some field-weighted-average measure of resolution over the desired operational field of view (OFOV). Furthermore, when used with a mosaic detector array in the focal plane, detector effects eliminate the advantage of the aplanatic design even at small field angles. For wide fields of view, the focal plane is frequently despaced to balance field curvature with defocus thus obtaining better overall performance. We will demonstrate that including detector effects in the optical design process results in a different optimal (nonaplanatic) design for each OFOV that is even superior to an optimally despaced aplanatic design. (c) 2006 Society of Photo-Optical Instrumentation Engineers.

Journal Title

Optical Engineering

Volume

45

Issue/Number

6

Publication Date

1-1-2006

Document Type

Article; Proceedings Paper

Language

English

First Page

10

WOS Identifier

WOS:000239345200009

ISSN

0091-3286

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