Abstract
The high noise level of acousto-optic images is reduced by utilizing the frequency difference between the image and noise light. A hologram is made of the acousto-optic image with a reference beam having a frequency equal to that of the image light. As the noise light is of a different frequency, it is not holographically recorded. When the holographic image is observed, only a duplicate of the acousto-optic image is seen, free of the background noise. Acousto-optic images 10 dB below noise level have been detected using this technique.
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