Electronic Recording Of Holograms With Applications To Holographic Displays

P. C. Claspy; F. L. Merat

doi:10.1117/12.958054

2 November 1979 Electronic Recording Of Holograms With Applications To Holographic Displays

P. C. Claspy, F. L. Merat

Proceedings Volume 0199, Advances in Display Technology; (1979) https://doi.org/10.1117/12.958054
Event: 23rd Annual Technical Symposium, 1979, San Diego, United States

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.

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P. C. Claspy and F. L. Merat "Electronic Recording Of Holograms With Applications To Holographic Displays", Proc. SPIE 0199, Advances in Display Technology, (2 November 1979); https://doi.org/10.1117/12.958054

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KEYWORDS

Holograms

Cameras

Heterodyning

Modulation

Holography

Spatial frequencies

Holography applications

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