Pit formation observed in a multilayer dielectric coating as a result of simulated space environmental exposure.
Appl Opt
; 41(16): 3142-9, 2002 Jun 01.
Article
em En
| MEDLINE
| ID: mdl-12064393
ABSTRACT
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 microm at the surface and extended to the substrate material, in which a 10-microm-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.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2002
Tipo de documento:
Article