REAL-TIME DYNAMIC HOLOGRAPHIC IMAGE STORAGE DEVICE

摘要

2028137 9010258 PCTABS00002 A real-time dynamic holographic image storage device uses four-wave mixing in a pair of photo-refractive crystals (10, 14). An oscillation is produced between the crystals (10, 14) which can be maintained indefinitely after the initial object beam is discontinued. The object beam produces an interference pattern in a first crystal (10) to produce a phase-conjugate object beam which is directed towards the second crystal (14). In the second crystal (14), another interference pattern is created which produces a reconstructed object beam. The reconstructed object beam is directed back towards the first crystal (10). The interference patterns are produced by the interaction of the object and phase-conjugate object beams with a read and write beam in each of the crystals (10, 14). By manipulation of the ratio of the read and the write beam intensities in at least one of the crystals (10, 14), the phase conjugate or reconstructed object beam output therefrom can be amplified to maintain stable oscillation between the two crystals.