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Effects of long term space environment exposure on optical substrates and coatingsAt the time of our Second LDEF Post-Retrieval Symposium report, we had completed cleaning and measuring the post flight spectral performance of all of the samples except for the fused silica substrate with an antireflection (SiO2/TiO2) coating. As was documented in that report, after cleaning, all of the samples returned to their original pre-flight performance, with the exception of the fused silica anti-reflectance coated sample, which had significant degraded performance. All normal methods of removing the contaminant from the surface of this sample failed except for oxygen plasma etch. At the time of the previous report, we had only exposed the sample to three hours of plasma etch. We have since continued the plasma etch for a total of 32 hours, after which time, the transmission of the sample almost reached its pre-flight values. The peak areas of the transmission curves remained shifted approximately 150 nm. Of interest is the fact that the control samples, which hadn't flown, did not exhibit any spectral shifting. In summary, after the 6 yr exposure to the space environment, all of the coatings and substrates returned to their pre-flight performance after cleaning, with the exception of the antireflection coated fused silica sample. On this sample, the spectral transmission curves shifted approximately 150 nm.
Document ID
19950021232
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Vallimont, John
(Eastman Kodak Co. Rochester, NY, United States)
Brandt, E. Steven
(Eastman Kodak Co. Rochester, NY, United States)
Havey, Keith
(Eastman Kodak Co. Rochester, NY, United States)
Mustico, Arthur
(Eastman Kodak Co. Rochester, NY, United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1995
Publication Information
Publication: NASA. Langley Research Center, LDEF: 69 Months in Space. Third Post-Retrieval Symposium, Part 3
Subject Category
Optics
Accession Number
95N27653
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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