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Proceedings Paper

The development and characterization of advanced broadband mirror coatings for the far-UV
Author(s): Arika Egan; Brian T. Fleming; James Wiley; Manuel Quijada; Javier Del Hoyo; John Hennessy; Brian Hicks; Kevin France; Nicholas Kruczek; Nicholas Erickson
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Paper Abstract

We present a progress report on the development of new broadband mirror coatings that demonstrate ⪆ 80% reflectivities from 1020−5000Å. Four different coating recipes are presented as candidates for future far-ultraviolet (FUV) sensitive broadband observatories. Three samples were first coated with aluminum (Al) and lithium fluoride (LiF) at the NASA Goddard Space Flight Center (GSFC) using a new high-temperature physical vapor deposition (PVD) process. Two of these samples then had an ultrathin (10−20 Å) protective coat of either magnesium fluoride (MgF2) or aluminum fluoride (AlF3) applied using atomic later deposition (ALD) at the NASA Jet Propulsion Laboratory (JPL). A fourth sample was coated with Al and a similar high temperature PVD coating of AlF3. Polarized reflectivities into the FUV for each sample were obtained through collaboration with the Synchrotron Ultraviolet Radiation Facility at the National Institute of Standards and Technology. We present a procedure for using these reflectivities as a baseline for calculating the optical constants of each coating recipe. Given these results, we describe plans for improving our measurement methodology and techniques to develop and characterize these coating recipes for future FUV missions.

Paper Details

Date Published: 31 August 2017
PDF: 11 pages
Proc. SPIE 10397, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX, 1039715 (31 August 2017); doi: 10.1117/12.2274141
Show Author Affiliations
Arika Egan, Univ. of Colorado Boulder (United States)
Brian T. Fleming, Univ. of Colorado Boulder (United States)
James Wiley, Univ. of Colorado Boulder (United States)
Manuel Quijada, NASA Goddard Space Flight Ctr. (United States)
Javier Del Hoyo, NASA Goddard Space Flight Ctr. (United States)
John Hennessy, Jet Propulsion Lab. (United States)
Brian Hicks, NASA Goddard Space Flight Ctr. (United States)
Kevin France, Univ. of Colorado Boulder (United States)
Nicholas Kruczek, Univ. of Colorado Boulder (United States)
Nicholas Erickson, Univ. of Colorado Boulder (United States)


Published in SPIE Proceedings Vol. 10397:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX
Oswald H. Siegmund, Editor(s)

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