Abstract

Present situations of developments of digital spatial modulators are summarized and new models of the digital spatial modulators made of crystals of gadolinium molybdate are introduced. The first model is of a frame at a time mode. A principle of the design is based on the ferroelectric and ferroelastic properties of the crystal. The second model is of a line at a time mode. The developed models of 64 bits of a frame at a time mode and of 1152 bits of a line at a time mode are described with their experimental results of trials of writing holographic memories. The signal-to-noise ratio of 100 and 20 are obtained in the reconstructed images, respectively. Digital spatial modulators of thousands bits per frame with the data transfer rate of 100 kbits per second can be expected in their extensions.

© 1974 Optical Society of America

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