Efficient image projection by Fourier electroholography |
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Authors: | Makowski Michał Ducin Izabela Kakarenko Karol Kolodziejczyk Andrzej Siemion Agnieszka Siemion Andrzej Suszek Jaroslaw Sypek Maciej Wojnowski Dariusz |
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Affiliation: | Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00 662 Warsaw, Poland. michal.makowski@if.pw.edu.pl |
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Abstract: | An improved efficient projection of color images is presented. It uses a phase spatial light modulator with three iteratively optimized Fourier holograms displayed simultaneously--each for one primary color. This spatial division instead of time division provides stable images. A pixelated structure of the modulator and fluctuations of liquid crystal molecules cause a zeroth-order peak, eliminated by additional wavelength-dependent phase factors shifting it before the image plane, where it is blocked with a matched filter. Speckles are suppressed by time integration of variable speckle patterns generated by additional randomizations of an initial phase and minor changes of the signal. |
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