SPECTRALLY CONTROLLED INTERFERENCE OF PICOSECOND TIME-AND-SPACE-DOMAIN HOLOGRAMS

We show that two superimposed time-and-space-domain holograms in a per sistent spectral hole-burning material can produce destructive interfe rence, even if the path-length difference of the writing beams is cons tant. The cancellation of the amplitudes in the -1 diffraction order o ccurs when the two holograms have specially chosen spectral envelopes that represent a pair of complementary functions. By controlling the s pectrum of the holograms we are able to perform coherent subtraction a nd addition of images.