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Q: Quantenoptik

Q 34: Optical Applications I

Q 34.1: Invited Talk

Friday, April 6, 2001, 15:45–16:15, H 3010

Volume holography - storage and image processing for high-capacity data systems — •Cornelia Denz — Institut für Angewandte Physik, Technische Universität Darmstadt

In volume holographic memories, multiplexing of data is necessary to obtain storage capacities in the range of terabytes per square centimeter. Multiplexing techniques operating with a fixed geometry and a fixed wavelength are highly preferable, because they allow to realize systems without any mechanically moving parts. Among them, electric field multiplexing and phase-code multiplexing have the potential to realize storage and data processing systems simultaneously.

In this contribution, we present several realizations of optical memories emphasizing these data processing features. Phase-code multiplexing allows to perform arithmetic and logic operations on different data pages directly during readout of the memory. Moreover, using the phase as a means of data page encoding allows to implement novel schemes of data encryption that are extremely secure compared to standard data encryption techniques. Electric field multiplexing allows to realize spectral filters with a selectivity in the range of a few picometers.