Third-harmonic generation has been measured in poly(2,5-dimethoxy p-phenylene vinylene) thin film. The third-order optical susceptibility, χ(3), was evaluated to be 5.4×10−11 esu at 1.85 μm wavelength. This χ(3) value is about one order higher than that for poly(p-phenylene vinylene) and almost the same value as for poly(n-BCMU diacetylene) which possesses the highest χ(3) value among processible (solvent castable) polymeric materials.
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Kaino et al. (1989) studied this question.
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