Abstract
Relative specular reflectance R is defined as R = Rs/Rw, where Rs and Rw are absolute reflectances of a sample material s and a material w for which the index of refraction nw and the extinction coefficient kw are known quantities. An algorithm was developed for computing ns and ks from the sample’s R spectrum measured for radiant flux polarized perpendicular to the plane of incidence and reflected at oblique angle θ. Kramers-Kronig analysis of the R spectrum provides Δϕ the difference between phase shifts for electromagnetic waves reflected at the surfaces of materials s and w. Real and imaginary parts of a Fresnel equation for relative reflectivity provide equations for computing ns and ks when θ, Δϕ, nw, and kw. are known quantities. Optical constants for aqueous solutions containing NaCl were computed in this manner; distilled water was the reflectance standard.
© 1973 Optical Society of America
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