2 November 1979 Electronic Recording Of Holograms With Applications To Holographic Displays
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Abstract
The remote sensing, transmission, recording and display of visual information using holograms continues to be a desired goal, The fundamental problem is that conventional off-axis holograms have high space-spatial frequency bandwidth products which require extremely high resolution recording media. However, much of the essential visual information of a scene is intrinsically low spatial frequency information. In general, high spatial frequency has been required to separate the real and virtual images from the self-interference terms in the hologram. A viable alternative is to selectively eliminate the self-interference terms of the hologram during the recording process. One such method is electronic heterodyne recording where electro-optic modulation is used to introduce a sinusoidal phase shift between the object and reference wave. The resulting temporally modulated holographic interference pattern is scanned by a commercial image dissector camera and rejection of the self-interference terms is accomplished by heterodyne detection at the camera output. The electrical signal representing this processed hologram can then be used to modify the properties of a liquid-crystal light valve or similar device. Such display devices, when illuminated by coherent light, transform the displayed interference pattern into a phase modulated wave front rendering a three-dimensional image. System requirements of holographic display systems will be considered as well as specific requirements for television rate and format systems.
© (1979) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
P. C. Claspy, F. L. Merat, "Electronic Recording Of Holograms With Applications To Holographic Displays", Proc. SPIE 0199, Advances in Display Technology, (2 November 1979); doi: 10.1117/12.958054; https://doi.org/10.1117/12.958054
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