Effective surface PSD for bare hot-isostatic-pressed beryllium mirrors

Cynthia L. Vernold; James E. Harvey

doi:10.1117/12.50504

1 December 1991 Effective surface PSD for bare hot-isostatic-pressed beryllium mirrors

Cynthia L. Vernold, James E. Harvey

Proceedings Volume 1530, Optical Scatter: Applications, Measurement, and Theory; (1991) https://doi.org/10.1117/12.50504
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Our understanding of the relationship between optical surlace topography and scattering behavior has improved in recent years to the point where the scattering characteristics of optical systems are routinely controlled by placing specifications upon the root-mean--square (rms) surface roughness. Bare polished hot isostatic pressed (HIP) beryllium (Be) has consistently failed to obey the established topographic surface scatter models. Surface scatter in the form of the Bidirectional Reflectance Distribution Function (BRDF) from bare beryllium mirrors using several test wavelengths will be presented in this paper. This experimental data indicates that non-topographic scattering effects are significant for bare beryllium mirrors. An empirical "effective" surface power spectral density (PSD) function will be developed that can be used to predict the scattering behavior of bare polished HIP Be from topographic rms surface roughness data.

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Cynthia L. Vernold and James E. Harvey "Effective surface PSD for bare hot-isostatic-pressed beryllium mirrors", Proc. SPIE 1530, Optical Scatter: Applications, Measurement, and Theory, (1 December 1991); https://doi.org/10.1117/12.50504

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KEYWORDS

Beryllium

Bidirectional reflectance transmission function

Scattering

Surface finishing

Mirrors

Surface roughness

Scatter measurement

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