Holo TV

Tuesday, March 2, 2010

Holographic Imaging




A holographic image recording and reproducing system for use with a conventional television receiver. A laser beam which is intensity modulated in accordance with video information is projected through a Bragg cell deflection system to provide a scanning image beam. The undiffracted output beam from the Bragg diffraction scanning system is employed as the reference beam. The reference beam and the scanning signal beam are converged by an optical lens system at a Fourier transform plane where a light responsive film is transported. Image data from an entire horizontal scanning line of the TV image is overlapped to provide a single holographic image, and a separate deflection mirror or other deflecting system is provided to sweep the scanning signal beam and the reference beam, still converged, slowly across the width of the even more slowly moving film. For playback, the reference beam component is removed, the film is swept by an unmodulated scanning signal beam following the same scanning pattern as the original recording signal beam, and a photodetector is positioned on a projection of the path of the original reference beam to reconstruct the television signal for playback through the TV receiver.

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