This paper presents a method of measuring the roughness of a reflecting surface by studying the contrast ratio of a holographic interference pattern of this surface. A practical experimental configuration is illus-trated along with the measurement results obtained for a set of lapped steel specimens. In addition, an approximate scalar theory is presented that correlates well with experiment.
W. B. Ribbens, "Surface Roughness Measurement by Holographic nterferometry," Appl. Opt. 11, 807-810 (1972)