Compatibility of temporal multiplexed spatial light modulator with optical image processing |
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Authors: | Morgan Madec Wilfried Uhring Pascal Joffre |
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Institution: | a Institut d’électronique du Solide et des Systèmes, 23, rue du Loess, 67037 Strasbourg, France b Institut de Recherche sur le Cancer de l’Appareil Digestif, Hôpital Civil, 67091 Strasbourg, France c Micromodule, 38, rue Jim Sévéllec, 29200 Brest, France |
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Abstract: | The tendency today is to replace high-dynamic light modulators by high-speed binary ones (of which the micromirror is the best example). This kind of spatial light modulators (SLM) fulfils all the present needs in displays. They are used in optical communications as binary systems and also in display applications (video projectors) with temporal multiplexing, in order to generate greyscale or colour images. In optical processing, and in the majority of coherent applications, temporal dithering introduces some distortions. In this paper, this point is studied with simulations. We point out that temporal multiplexing cannot be used in the Fourier plane. In the imaging plane, the distortion is weak if the filter has a positive impulse response. |
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Keywords: | Spatial light modulator Light modulation Ferroelectric liquid crystal Temporal multiplexing Coherent light Image processing Optical correlator Optical image processing |
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