Contamination Sensitivity Of Typical Mirror CoatingsÃ¢â‚¬â€?A Parametric Study

John F. Osantowski

doi:10.1117/12.933641

12 April 1983 Contamination Sensitivity Of Typical Mirror Coatings - A Parametric Study

John F. Osantowski

Proceedings Volume 0338, Spacecraft Contamination Environment; (1983) https://doi.org/10.1117/12.933641
Event: 1982 Technical Symposium East, 1982, Arlington, United States

Abstract

Contamination budgeting for space optical systems basically starts at understanding the sensitivity of component performance, e.g. mirror reflectance, window transmittance, etc., to surface deposits. To evaluate contamination sensitivity for mirror coatings, eight types representative of those used in the vacuum ultraviolet, visible, and infrared were modeled assuming that the contaminant is uniformly deposited on the mirror surface. Parametric studies over a range of complex refractive indices combined with an examination of optical data available for several organic materials suggested division of the contaminant layer index into three categories, N = 1.5 + 0.1i, N = 1.5 + 0.5i, and N = 1.5 + 2.0i. Contaminant thickness sensitivity curves were then calculated for each of the selected mirror coatings. For comparative purposes, critical thicknesses for each type were extracted, assuming a reflectance loss of 10 percent was allowable. Critical thicknesses ranged from about 10Å. to 1000Å depending on the specifics of coating design and spectral region.

Citation Download Citation

John F. Osantowski "Contamination Sensitivity Of Typical Mirror Coatings - A Parametric Study", Proc. SPIE 0338, Spacecraft Contamination Environment, (12 April 1983); https://doi.org/10.1117/12.933641

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