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In addition, the algorithm enhancements allow for registration convergence at 10%-20% greater shifts.The precision and accuracy of profile measurement achieved by a point diffraction interferometer (PDI) is determined by a spherical diffraction reference wavefront whose quality is mainly controlled by the pinhole's alignment. In consideration of a Gaussian beam incidence, different diffraction wavefront errors stemming from misalignment of pinhole including lateral shift, defocus, and tilt are analyzed with the help of a proposed systema
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