Stability of XeF2 passivated Al plus LiF as possible coating for HWO

Devin M. Lewis; Tanner D. Rydalch; David D. Allred; Luis Rodriguez de Marcos; Manuel A. Quijada; Javier del Hoyo; Mateo Batkis

doi:10.1117/12.3018471

26 August 2024 Stability of XeF₂ passivated Al plus LiF as possible coating for HWO

Devin M. Lewis, Tanner D. Rydalch, David D. Allred, Luis Rodriguez de Marcos, Manuel A. Quijada, Javier del Hoyo, Mateo Batkis

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131000K (2024) https://doi.org/10.1117/12.3018471
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

A new deposition method developed by Goddard Space Flight Center fluorinates Al mirrors with XeF2 followed by a LiF coating to create what they term Al+XeLiF. This in-situ, room temperature process produces mirrors with high reflectivity in a broad spectral range, from the FUV to the IR, and is reported to be stable in relative humidities of 30% and lower. These mirrors are envisioned for missions requiring sensitivity down to 100 nm wavelength such as the habitable worlds observatory. Because most mission integration and testing campaigns require prolonged exposure to lab environments, and launch sites experience high relative humidities (RH) on average, some at 80% RH. We investigate Al+XeLiF stability in a wider range of temperatures and humidities along with employing additional characterization techniques including atomic force microscopy and x-ray photoelectron spectroscopy. We found that Al+XeLiF is stable in environments up to 82%RH when kept at cooler temperatures (3°C and 21°C). However, this material is unstable when stored at 60°C, experiencing roughening and loss in reflection from resulting Al surface plasmon excitation.

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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Devin M. Lewis, Tanner D. Rydalch, David D. Allred, Luis Rodriguez de Marcos, Manuel A. Quijada, Javier del Hoyo, and Mateo Batkis "Stability of XeF₂ passivated Al plus LiF as possible coating for HWO", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131000K (26 August 2024); https://doi.org/10.1117/12.3018471

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