An opto-acoustic device is proposed that can serve either as a correlation detector or a matched filter, and has a nominal bandwidth of 500 MHz and a time-bandwidth product of several thousand. The device consists of a pair of small (5-by-5-by-20-mm) microwave acoustic cells in close juxtaposition, which successively modulate a laser beam incident at the Bragg angle. This modulated light is focused to a point on a photodetector. The ...
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