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Proceedings Paper

New far-UV instrumentation enabled by recent advances in mirror coating processes
Author(s): Emily M. Witt; Brian T. Fleming; Kevin France; Manuel Quijada; John Hennessy; Arika Egan; James Wiley
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Paper Abstract

Recent technological advances have opened up new instrument capabilities for ultraviolet (UV) astronomy. Of particular interest are advanced deposition processes that have increased the performance of Lithium Fluoride (LiF) overcoated mirrors while mitigating the procedures required for their handling, raising the reflectivity from ∼ 65% to greater than 80% in the Lyman UV (λ > 1000 Å). Traditional magnesium fluride (MgF2) protected aluminum mirrors have a reflectivity truncated at 1150 Å, missing crucial tracers of warm gas and molecules. The hygroscopic sensitivity of LiF has traditionally added to mission risk and cost. The addition of a thin capping layer of another material (AlF3, MgF2) on top of the LiF has been shown to mitigate the degradation by providing a barrier against moisture. These advances open up a new paradigm in UV astronomy by enabling multi-passed optical designs without the crippling 1000 - 1150 Å throughput losses inherent to conventional mirror coatings. We present recent progress in the testing of enhanced lithium fluoride (eLiF) coated optics, and discuss potential instrument concepts for UV astronomy in the next decade.

Paper Details

Date Published: 6 July 2018
PDF: 11 pages
Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 1069904 (6 July 2018); doi: 10.1117/12.2312240
Show Author Affiliations
Emily M. Witt, Univ. of Colorado Boulder (United States)
Brian T. Fleming, Univ. of Colorado Boulder (United States)
Kevin France, Univ. of Colorado Boulder (United States)
Manuel Quijada, NASA Goddard Space Flight Ctr. (United States)
John Hennessy, Jet Propulsion Lab. (United States)
Arika Egan, Univ. of Colorado Boulder (United States)
James Wiley, Univ. of Colorado Boulder (United States)

Published in SPIE Proceedings Vol. 10699:
Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Shouleh Nikzad; Kazuhiro Nakazawa, Editor(s)

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