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Correlation method for testing optical surfaces

Our paper describes a relatively simple method for testing a general shape of optical surfaces (i.e. flat, spherical or aspherical surfaces). The aim of this work is to propose a simple evaluation method that will enable to speed up the testing process of optical surfaces. The proposed method does not require to make a detail analysis of the interference field, i.e. determination of the shape and orders of interference fringes as it is necessary with existing interferometric methods. The deviation of the tested surface from its nominal shape is characterized by a correlation coefficient between the tested wave field and reference wave field that corresponds to the nominal shape of surface. By minimization of the correlation coefficient, one can obtain information about the deviation of the tested optical surface from its nominal shape. The evaluation method is universal and can be used for testing flat, spherical or aspherical optical surfaces.