Scanning technique for coherent processors

Abstract

In certain linear coherent processing techniques a temporal signal is spatially encoded on an amplitude transmittance that serves as the processor input. In this paper a technique is presented whereby the temporal signal is alternately used to amplitude- and/or phase-modulate a raster scan of the processor's input plane. Using the temporal integrating and summing properties of a hologram placed in the processor's output plane, one can then regain the identical processor output that would have arisen from the spatial encoding technique. Preliminary experimental results are presented along with the theory of the input scanning technique.