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Experimental demonstration of a chirp-modulated joint transfrom correlator using separate input SLMs

The chirp encoded joint transform correlator (JTC) with separate input planes has been demonstrated in two experiments using Michaelson and Mach-Zehnder interferometers to combine the inputs. In the first, the Fourier plane modulation characteristics of the chirp- encoded JTC was investigated by correlating two pinholes. The peak-to-noise ratio performance in this experiment was 26 dB. In the second, chirp modulation was applied to correlating one fingerprint against a set of four fingerprints. Binary ferroelectric SLMs were used as inputs and for display in the Fourier plane. A discrimination ratio of 8.1 dB was demonstrated for the chirp modulated JTC. This is a 2.3 dB improvement over the discrimination observed using the same equipment in a binary JTC arrangement.