Signal window minimum average error algorithm for multi-phase level computer-generated holograms
Résumé
This paper extends the article ''Signal window minimum average error algorithm for computer-generated holograms'' Ž. JOSA A 1998 to multi-phase level CGHs. We show that using the same rule for calculating the complex error diffusion Ž weights, iterative-algorithm-like low-error signal windows can be obtained for any window shape or position on-or. off-axis and any number of CGH phase levels. Important algorithm parameters such as amplitude normalisation level and phase freedom diffusers are described and investigated to optimize the algorithm. We show that, combined with a suitable diffuser, the algorithm makes feasible the calculation of high performance CGHs far larger than currently practical with iterative algorithms yet now realisable with modern fabrication techniques. Preliminary experimental optical reconstructions are presented. q