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Over the last forty years, spatial optical information processing using principles of holography has found various important applications in science and technology. One of the crucial advances in this field was the development of so-called dynamic holography, where information that is changing in time can be recorded, processed and reconstructed. In order to implement a dynamic hologram, an appropriate recording media with fast time response is required. True real-time holographic recording can be performed using media possessing nonresonant bound electron nonlinearities. The time response of these nonlinear processes is on the order of femtoseconds and is therefore sufficiently fast for any real-time application. The method of dynamic image processing using three-wave mixing in a second-order (χ(2)) nonlinear crystal was experimentally introduced by Andreoni et al. This approach was further developed and treated in terms of holographic image processing by Denisyuk and coauthors.
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