Spatial Filtering In Photorefractive Materials

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Abstract
Spatial filtering and hologram formation using coherent and incoherent imaging techniques are investigated experimentally in photorefractive materials. Spatial filtering involves imaging appropriate filter designs into a BaTiO3 crystal in which a Fourier-transform hologram has already been written. White-light filter images erase selected frequency components of the hologram preventing them from appearing in the reconstruction. A similar imaging technique is also used to create holograms in photorefractive materials. Standard computer-generated holograms are imaged into the crystal, changing the index of refraction of the material by the photorefractive effect in proportion to the local intensity. The resulting index modulation pattern forms a phase hologram with the imaging and spatial frequency characteristics of the original computer-generated transmittance. Because the spatial filters and holograms used in these experiments may be electronically produced and incoherently displayed, these systems can be updated easily without the usual constraints of coherent spatial light modulators. Characteristics of these systems and their application to real-time computer display are reported.

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