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Light scattering characterization of optical components - BRDF, BTDF and scatter losses

机译：光学组件的光散射特性-BRDF，BTDF和散射损耗

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Light scattering caused by imperfections of optical components can critically affect the performance of optical systems in terms of losses and image degradation. Because of the numerous potential sources of scattering such as roughness, surface and sub-surface defects, bulk inhomogeneities, as well as coatings, scattering properties must be carefully specified and measured at the wavelengths of application. Bidirectional Reflectance and Transmittance Distribution Functions (BRDF / BTDF) are used to quantify the angle resolved scattering properties. The data can be used as an input for optical engineering software just as FRED, ASAP, ZEMAX for stray light modeling. In addition, analyzing the scattered light can provide valuable information about the relevant imperfections. The presentation provides an overview of instrumentation for light scattering measurements at wavelengths ranging from the visible to the extreme ultraviolet and the infrared spectral regions. Examples of applications will be discussed ranging from superpolished mirrors to diffraction gratings, interference coatings, and black absorbing coatings.
机译：由光学部件的缺陷引起的光散射会严重影响光学系统的性能，包括损耗和图像质量下降。由于存在大量潜在的散射源，例如粗糙度，表面和亚表面缺陷，整体不均匀性以及涂层，因此必须仔细指定散射特性，并在应用波长下对其进行测量。双向反射率和透射率分布函数（BRDF / BTDF）用于量化角度分辨散射特性。数据可以用作光学工程软件的输入，就像FRED，ASAP和ZEMAX用于杂散光建模一样。另外，分析散射光可以提供有关相关缺陷的有价值的信息。该演示文稿概述了用于从可见光到极紫外和红外光谱区域的波长的光散射测量的仪器。将讨论应用实例，范围从超抛光镜到衍射光栅，干涉膜和黑色吸收膜。

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