Abstract

The implementation of non-zero-order joint-transform correlators (JTC’) is presented. The zero-order spectra (i.e., the autocorrelation power spectra) are removed from the joint-transform power spectrum by use of phase-shifting techniques by which the output diffraction and input spatial domain can more efficiently be utilized. Applications of the phase-shifting techniques to both conventional JTC’ and phase-transformed input JTC’ (PJTC’) are discussed. Compared with the conventional JTC, the PJTC has the advantages of higher light efficiency, a better signal-to-clutter ratio, and the simplicity to realize phase shifting. We anticipate that the proposed non-zero-order JTC’ should have a significant impact on the future development of more efficient JTC’.

© 1997 Optical Society of America

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