Patent ID: 6339469
Filing Date: 2002-01-15
Classification: G01J,G03H

Abstract:
An iterative method of determining the intensity and phase distribution of a coherent light beam (4), in a plane, comprising the steps of:measuring the intensity Ii, i=1 . . . N, of the beam, in N planes, N&gE;3, including the plane wherein intensity and phase distribution is to be determined, choosing, for plane i=1, an initial phase matrix &phgr;1 and calculating a complex amplitude matrix, by term-wise multiplying the phase matrix ei&phgr;1 by the corresponding amplitude matrix A1, for each plane j>1: determining a propagated complex matrix Bâ€²j from the measured amplitude matrix Ajâˆ’1 of plane jâˆ’1 and the phase matrix &phgr; of plane jâˆ’1, extracting, from Bâ€²j, a phase matrix of plane j, iterating the method up to convergence, with j=1 when jâˆ’1=N.