28 July 2014 Fluoride damage to substrates during stripping of mirrors
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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.
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Andrew C. Phillips, Andrew C. Phillips, Brian DuPraw, Brian DuPraw, David Hilyard, David Hilyard, Donald Gavel, Donald Gavel, Daren Dillon, Daren Dillon, Renate Kupke, Renate Kupke, } "Fluoride damage to substrates during stripping of mirrors", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91515I (28 July 2014); doi: 10.1117/12.2056887; https://doi.org/10.1117/12.2056887
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