OPTICAL METHOD FOR CHARACTERISING A DIFFRACTIVE SURFACE AND APPARATUS FOR IMPLEMENTING SUCH A METHOD

摘要

An optical method for characterising a diffractive surface (SD) having a crystal grain structure, comprising the steps consisting of: a) successively illuminating said surface with a plurality of light beams (Fi) having propagation directions inclined by a same angle Θ; relative to the normal to the surface and of which the projections on the surface form azimuth angles &phgr;&idigr; that are different relative to a reference direction; b) acquiring an image of said surface corresponding to each of said light beams; and c) digitally processing said images to obtain at least one item of information on at least one property of said surface chosen from: the grain structure, texture and level of ordering thereof. An optical head (TO) and apparatus for implementing such a method.