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- W2032827015 abstract "Third-order nonlinear optical properties of two thiophene-based conjugated polymers (polythieno(3,2-b)thiophene (PTT) and poly[1,4-di-(2-thienyl)benzene] (PDTB)) have been studied by third-harmonic generation in the fundamental wavelength range 1.064 to 1.907 μm. In both cases a three-photon resonance enhancement of the average cubic susceptibility «χ(3)(−3ω; ω, ω, ω)’ in the 1.25 to 1.45 μm fundamental wavelength range is observed. Whereas in PDTB the three-photon resonance is narrow (Γ ≌ 780 cm−1), in PTT it is large and shows fine structure. The last observation is interpreted in termas of a resonance enhancement with collective CC vibrations. The observed differences in resonant values of «χ(3)(−3ω; ω, ω, ω)’ are equal to 2±0.2 × 10−11 and 1.1 ± 0.1 × 10−11 e.s.u. in PTT and PDTB, respectively, and may be well accounted for by the difference in the conjugation length." @default.
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- W2032827015 date "1990-08-01" @default.
- W2032827015 modified "2023-09-25" @default.
- W2032827015 title "Frequency variation of cubic susceptibility in the new conjugated polymers PTT and PDTB" @default.
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- W2032827015 doi "https://doi.org/10.1016/0379-6779(90)90149-f" @default.
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