Phase-shifting joint-transform correlator with a wavelength-shifted laser diode

摘要

A joint-transform phase correlator is presented for processing multiple-pattern recognition that uses the six-step phase-shifting interferometer with a wavelength-shifted laser diode. The correlation peaks are obtained by the numerical Fourier transformation of a measured phase in an on-axis joint power spectrum. Multiple-pattern phase correlation can be performed to demonstrate high discrimination without the intermodulation owing to zero optical path differences between multiple targets in the interferometer. The experimental results are shown.