Keywords: volume holographic data storage, read-write holographic data storage, phase–conjugate readout, non-linear signal processing.

This paper describes how database systems can use and exploit a cost-effective active storage hierarchy. By active storage hierarchy we mean a database system that uses all storage media (i.e. optical, tape, and disk) to store and retrieve data and not just disk. We describe and emphasize the active part, whereby all storage types are used to store raw data that is converted to strategic busine...

This paper presents a survey of control issues in optical storage data systems. Servo control has the important role of moving the optical pick to a track and regulating it to read and write data along the track. The performance of the servo system determines total system performance, such as access time, data rate, and latency. In this regard, we review servo control systems and walk readers t...

The study of amino acid based nonlinear optical (NLO) materials with optimum physical properties is an important area due to their practical applications such as optical communication, optical computing, optical information processing, optical disk data storage, laser fusion reactions, laser remote sensing, colour display, medical diagnostics, etc. Also, microelectronic industries require cryst...

A technique for interpreting acoustic signals is presented based on an extension of the chromatic analysis used successfully in the optical domain. To illustrate the potential of this interpretation technique it was applied to monitoring power switchgear because of the inherent complexity of the various phenomena involved and their interaction with each other. In particular, we present a techni...