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16 December 1993 Nonlinear spectroscopy of polydiacetylenes
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The third order susceptibility of a polydiacetylene polymer was investigated by three different nonlinear spectroscopic techniques in order to test two existing microscopic theories which predict the nonlinear response of such molecular systems. We previously found good agreement between a four essential state model and the THG spectra of (pi) -electron conjugated backbone polymers. However, when such a model was extended to two additional third order susceptibility spectra, poor agreement was found. In contrast the recently developed anharmonic oscillator model fitted well all four experimentally obtained spectra of the third order susceptibility.
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William Eugene Torruellas, Myoungsik Cha, Brian L. Lawrence, George I. Stegeman, Hong Xiang Wang, Akira Takahashi, Shaul Mukamel, and Jeffrey S. Meth "Nonlinear spectroscopy of polydiacetylenes", Proc. SPIE 2025, Nonlinear Optical Properties of Organic Materials VI, (16 December 1993);

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