Gerchberg-Saxton algorithm (Tutorial)

Gerchberg-Saxton is a phase retrieval algorithm, which attempts to retrieve the phase corresponding to two intensity images taken in the near and far-field respectively. It can also be used for calculating computer-generated holograms (phase masks) that generate a desired intensity/field in the far-field (Fourier plane).

00:00 Introduction
02:30 Phase retrieval example
09:03 Calculating a phase mask to generate a desired intensity in the Fourier plane.
09:45 Calculating a phase mask to generate a desired field (amplitude and phase) in the Fourier plane
14:55 Limits of efficiency for field generation
16:15 Example of calculating phase masks for the first 55 Laguerre-Gaussian modes.