This paper describes the digital retrieval of a wave aberration when the modulus of pupil function and the point spread function (psf) are known. The Gerchberg-Saxton algorithm is used as the iterative retrieval method with an additional
a priori information. Computer simulation in the case of 3rd-order spherical aberration is performed and some effects with regard to the measurement of the psf on the algorithm are demonstrated. It has been shown that the algorithm is considerably influenced by the accuracy of the measurement of the psf.
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