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Proceedings Paper

Fluoride damage to substrates during stripping of mirrors
Author(s): Andrew C. Phillips; Brian DuPraw; David Hilyard; Donald Gavel; Daren Dillon; Renate Kupke
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Paper Abstract

Fluorides are useful low-index materials that can be used to enhance reflectivity of over-coated metallic films. In particular, YF3 has been suggested as a useful low-stress low-index material in the IR where film layers must be thicker, and it has also been found to enhance durability in silver-based mirrors. However, if these mirrors need to be stripped for recoating, care must be taken with the stripping process to avoid damaging a silica-based substrate through production of hydrofluoric acid. We present data that such damage can occur, and discuss empirically-derived alternative stripping processes in place of the normal acid-based approach to mitigate the danger.

Paper Details

Date Published: 28 July 2014
PDF: 6 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91515I (28 July 2014); doi: 10.1117/12.2056887
Show Author Affiliations
Andrew C. Phillips, Univ. of California Observatories (United States)
Brian DuPraw, Univ. of California Observatories (United States)
David Hilyard, Univ. of California Observatories (United States)
Donald Gavel, Univ. of California Observatories (United States)
Daren Dillon, Univ. of California Observatories (United States)
Renate Kupke, Univ. of California Observatories (United States)


Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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