BS ISO 19986:2020 pdf free.Lasers and laser-related equipment一Test method for angle resolved scattering. BS ISO 19986 This document describes procedures for the determination of the angle resolved scattering by optical components such as coated or uncoated optical elements, photonic structures, and materials that can be transparent, translucent, or opaque. It comprises scattering into the scattering sphere around the specimen usually...