Wavelength dependence of scatter from O-50 grade Beryllium mirrors

Charles M. Egert; John C. Stover; Marvin L. Bernt

doi:10.1117/12.162649

1 December 1993 Wavelength dependence of scatter from O-50 grade Beryllium mirrors

Charles M. Egert, John C. Stover, Marvin L. Bernt

Proceedings Volume 1995, Optical Scattering: Applications, Measurement, and Theory II; (1993) https://doi.org/10.1117/12.162649
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

A set of O-50 grade beryllium mirrors, removed from the polishing process at regular intervals, were subjected to a study of the wavelength dependence of scatter in the visible to infra-red. Analysis of these scatter measurements showed that the roughness calculated from the scatter measurements exhibited a parabolic wavelength dependence. The slope of the calculated roughness as a function of (lambda) ^1/2 (the parabolic slope) was taken as a measure of this anomalous scatter wavelength dependence. Mirrors with significant surface pitting were found to have the largest parabolic slopes; while unpitted beryllium mirrors, exhibited similar, though still significant parabolic slopes, indicating that the wavelength scaled as expected. Scatter measurements made on two key beryllium mirrors partially coated with a thin aluminum film further confirmed that surface pitting and intrinsic optical properties of beryllium both contributed to anomalous scatter.

Citation Download Citation

Charles M. Egert, John C. Stover, and Marvin L. Bernt "Wavelength dependence of scatter from O-50 grade Beryllium mirrors", Proc. SPIE 1995, Optical Scattering: Applications, Measurement, and Theory II, (1 December 1993); https://doi.org/10.1117/12.162649

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available