Gerchberg–Saxton algorithm
Gerchberg Saxton Algorithm
The Gerchberg Saxton (GS) algorithm is an algorithm used for retrieving the phase of a pair light distributions (or any other mathematically valid distribution) related via Fourier transform if their intensities at their respective optical planes are known.
It is often necessary to know only the phase distribution from one of the planes, since the phase distribution on the other plane can be obtained by performing a Fourier transform on the plane whose phase is known. (Although often used for two dimensional signals the GS algorithm is also valid for 1-d signals)
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Graphical explanatory material by Kevin Cowtan [1]