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By M G Joshi
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Additional info for Holography
For home viewing, the laser illuminates the hologram frames. The black and white picture is picked up by the TV camera and the colour information is stripped off the video signal to provide regular colour TV signals for display on the home set. The use of embossed vinyl hologram tapes, in addition to providing movies at a reasonable cost, has the advantage of being far more resistant to scratches, abrasions and imperfections than ordinary film or magnetic tape. Replication of Holograms Copies of holograms may be needed for purposes of display, to suit the needs of the commercial world.
The interference effects are recorded as surfaces within the recording medium, forming, in effect, a three-dimensional grating. The diffraction process from such a structure is analogous to X-ray diffraction from crystals and in this context, studies have been made to determine the response of simple hologr~m gratings. These studies provide information about diffraction efficiency, as well as angular lorientation and wavelength sensitivities of thick holograms. A variety of three-dimensional recording media have been identified, including thick photographic emulsions, lithh,lm niobate crystals, and photochromic materials.
The storage life of the hologram may 31 HOLOGRAPHIC MATERIALS be several weeks, or even longer tinder dark refrigerated conditions. Electrical and Magnetic Recording of Holograms Considerable interest has been shown in improving holographic techniques which are independent of chemical processing. One possibility is to generate a direct electrical or magnetic image on a charged selenium plate or on a magnetic tape. So far, the former method has not produced usable results but a technique using a thin recording film of ferroelectric barium titanate and lithium niobate crystals has been tried.