Physics – Optics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apopt..41.3142f&link_type=abstract
Applied Optics, vol. 41, iss. no. 16, p. 3142-3149
Physics
Optics
Aerospace Environments, Dielectrics, Electron Beams, Optical Materials, Protons, Radiation Effects, Spaceborne Telescopes, Thin Films, Topography
Scientific paper
Certain spaceborne telescope designs require that dielectric-coated lenses be exposed to the energetic electrons and protons associated with the space environment. Test coupons that were exposed to a simulated space environment showed extensive pitting as a result of dielectric breakdown. A typical pit was 50-100 mum at the surface and extended to the substrate material, in which a 10-mum-diameter melt region was found. Pitting was not observed on similar samples that had also been overcoated with a transparent conductive thin film. Measurement of the bidirectional reflectance distribution transfer function showed that pitting caused a fivefold to tenfold increase in the scattering of visible light.
Barrie James D.
Coleman Dianne J.
Fuqua Peter D.
Meshishnek Michael J.
Presser Nathan
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