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Proceedings Paper

Impact of surface roughness on the scatter losses and the scattering distribution of surfaces and thin film coatings
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Paper Abstract

The estimation of the impact of surface roughness on the light scattering losses and the scattering distribution is of crucial importance for deriving roughness specifications for optical surfaces. A detailed roughness analysis should always be based on surface Power Spectral Density functions and the band-limited roughness relevant for the application at hand. The scattering from single surfaces can easily be estimated using rather simple formulas. The most commonly used expression to estimate the total scattering, however, is only valid if the roughness is small and the correlation width is large compared to the wavelength of light. A special expression has been used in the thin film community for surface structures with short correlation lengths. It will be demonstrated that distinguishing between these limiting cases is unnecessary simply by using the concept of band-limited roughness. Different models are compared to results of scatter measurements and discussed with respect to their ranges of validity.

Paper Details

Date Published: 30 September 2011
PDF: 8 pages
Proc. SPIE 8169, Optical Fabrication, Testing, and Metrology IV, 81690R (30 September 2011); doi: 10.1117/12.896989
Show Author Affiliations
Sven Schröder, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Tobias Herffurth, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Angela Duparré, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
James E. Harvey, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 8169:
Optical Fabrication, Testing, and Metrology IV
Angela Duparré; Roland Geyl, Editor(s)

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