Repartition angulaire de la lumiere diffusee par un echantillon poli du super-alliage CoCr2WNi (Alacrite XSH); application a la determination des parametres statistiques caracterisant la rugosite superficielle

摘要

A quasi-monochromatic light beam (λ = 632, 8 nm), polarized either P or S, is directed under oblique incidence towards a small surface element of a mirror-polished XSH alacrite sample. Measurements of light scattering angular distribution are made at several sites (site area ≈ 1 mm~2) on the sample surface. Then, angle-resolved scattering theory is used to evaluate surface roughness parameters: root-mean square hight δ and correlation length σ. For S-polarized incident light, cross-polarization scattering is observed in disagreement with the theoretical calculations. The phenomenon takes place in the case where the roughness is high. The quantitative effect of this depolarization on the values of parameters δ and σ is examined.