Abstract
We recently reported remarkably large third- order nonlinear optical susceptibilities in a series of metal-substituted tetrakis-(cumylphenoxy)phthalocyanines1 (MPcCP4) at 1.064 μm, a wavelength far from resonance with the main absorption bands. The χ(3) ranged up to 2 × 10−10 esu. The figures of merit χ(3)/ατ of these materials are also very large. The third- order susceptibility was enhanced by a factor of up to 50 by transition-metal substitution. The underlying mechanism responsible for the nonlinear response in these materials was not known. To elucidate the mechanism, the metal- free prototype, H2PcCP4, was studied in more detail.
© 1991 Optical Society of America
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