Knowledge of bidirectional reflectance angular distribution of low reflectivity surfaces is important for predicting stray light in optical systems. We have performed bidirectional reflectance distribution measurements at wavelengths of 633 nm and 850 nm for surfaces coated with Z302, a commercial optical coating material widely used in optical instruments. The bidirectional reflectance properties of these surfaces depend on surface topology characterized by thickness and roughness parameters. To explain our results, we have employed directional scatter analysis of the experimental data that can be represented by a linear combination of diffuse, glossy, and specular, components. Modeling the bidirectional reflectance distribution in the context of a ray-trace can provide important information of stray light, coated surfaces, and their impact on performance of optical instruments.

Date Published: 11 September 2019
PDF: 7 pages
Proc. SPIE 11103, Optical Modeling and System Alignment, 111030I (11 September 2019); doi: 10.1117/12.2529629

Published in SPIE Proceedings Vol. 11103:
Optical Modeling and System Alignment
Mark A. Kahan; José Sasián; Richard N. Youngworth, Editor(s)