Resolution Limit of Photorefractive Spatial Light Modulators,
ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND)
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The experimental set-up of our photorefractive incoherent to coherent converter is shown in figure 1. With two interfering argon-ion-laser beams Lambda514.5 nm we write a phase hologram into a photorefractive KNbO3 crystal. Using anisotropic Bragg diffraction 2 we choose the direction of the diffracted beam lambda632.8 nm perpendicular to the crystal surface. The input image is projected into the crystal plate anti-parallel to the diffracted beam. A short wavelength transmitting dichroitic beam splitter is used to separate the incoherent light from the diffracted beam.