A NEW METHOD FOR PHASE RETRIEVAL IN THE OPTICAL-SYSTEM

In this letter, a new recursive algorithm to implement phase retrieval from two intensities in the two-dimensional Fourier transform domain is presented. In terms of the cascading property and additivity of the order of the fractional Fourier transform, a set of convolution equat ions is exactly derived. Applying recursive algorithm, these equations can be easily solved. This approach simplifies significantly computat ional manipulations comparing with conventional iterative algorithms a nd does not need initial phase distribution.