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Proceedings Paper

Mirror coatings for large aperture UV optical infrared telescope optics
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Paper Abstract

Large space telescope concepts such as LUVOIR and HabEx aiming for observations from far UV to near IR require advanced coating technologies to enable efficient gathering of light with important spectral signatures including those in far UV region down to 90nm. Typical Aluminum mirrors protected with MgF2 fall short of the requirements below 120nm. New and improved coatings are sought to protect aluminum from oxidizing readily in normal environment causing severe absorption and reduction of reflectance in the deep UV. Choice of materials and the process of applying coatings present challenges. Here we present the progress achieved to date with experimental investigations of coatings at JPL and at GSFC and discuss the path forward to achieve high reflectance in the spectral region from 90 to 300nm without degrading performance in the visible and NIR regions taking into account durability concerns when the mirrors are exposed to normal laboratory environment as well as high humidity conditions. Reflectivity uniformity required on these mirrors is also discussed.

Paper Details

Date Published: 5 September 2017
PDF: 13 pages
Proc. SPIE 10398, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VIII, 103980X (5 September 2017); doi: 10.1117/12.2274794
Show Author Affiliations
Kunjithapatham Balasubramanian, Jet Propulsion Lab. (United States)
John Hennessy, Jet Propulsion Lab. (United States)
Nasrat Raouf, Jet Propulsion Lab. (United States)
Shouleh Nikzad, Jet Propulsion Lab. (United States)
Javier Del Hoyo, NASA Goddard Space Flight Ctr. (United States)
Manuel Quijada, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 10398:
UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VIII
Howard A. MacEwen; James B. Breckinridge, Editor(s)

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