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Photorefractive delay line for the visualization and processing of time-dependent signals

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Abstract

We present an optical time-delay line based on photorefractive beam coupling in a rotating crystal. The delay line can be tapped continuously or at selected positions. We demonstrate a 64-channel device with a BaTiO3 crystal rotating at 1.5 rpm, which gives approximately a 167-Hz bandwidth and 0.5 s of time delay for each channel.

© 1993 Optical Society of America

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