Abstract
A novel technique of wideband signal recording has been developed for the optical video disk. An FM videoband signal is carried by a traveling acoustic wave in the form of AM modulation through an acoustic medium under continuous laser illumination and transcribed optically onto a synchronously moving photosensitive medium. As the recording frequency bandwidth is not restricted by the laser beam diameter basically, a wideband recording system with large depth of focus can be established by using the large beam diameter. Wideband recording up to 18 MHz (1-microm record pitch) is experimentally verified using As-Se-S-Ge chalcogenide glass as a high resolution recording medium.
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