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Proceedings Paper

Manufacture of ISO mirrors
Author(s): Eric Ruch
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Paper Abstract

The three mirrors comprising the Infrared Space Observatory telescope are discussed. The mirrors are made of fused silica substrate using a Ritchey-Chretien configuration. The primary mirror is aspherical, has an aperture diameter of 640 mm, and a fast F number of F/1.6. The mirror is mechanically lightweighted to a ratio of 70 per cent and is figured to lambda/90 RMS at the specified wavelength of 5 microns. The aspherical secondary mirror has a diameter of 90 mm. The pyramidal mirror's four sides reflect the incoming light in four perpendicular directions toward the scientific instruments. Consideration is given to the manufacturing steps of these mirrors, including the lightweighting process, the thermal and mechanical interface machining, the acid etching, the aspherical grinding and polishing, the coating, and the assembly on their support structure. Wavefront error measurements show diffraction-limited performance for each mirror as well as for the whole telescope.

Paper Details

Date Published: 1 September 1991
PDF: 14 pages
Proc. SPIE 1494, Space Astronomical Telescopes and Instruments, (1 September 1991); doi: 10.1117/12.46730
Show Author Affiliations
Eric Ruch, SA Recherches et Etudes d'Optique et de Sciences Connexes (France)


Published in SPIE Proceedings Vol. 1494:
Space Astronomical Telescopes and Instruments
Pierre Y. Bely; James B. Breckinridge, Editor(s)

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