Third Harmonic Generation Study of Alpha-Thiophene Oligomers: Monomer to Octamer
SOUTH CAROLINA UNIV COLUMBIA DEPT OF CHEMISTRY AND BIOCHEMISTRY
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The second hyperpolarizabilities, gamma-3omega omega, omega, omega, of alpha-thiophene oligomers up to the octamer have been measured with third-harmonic generation experiments. Measurements in THF solutions with 1.91 micrometer fundamental radiation found significantly lower nonlinearity and conjugation length dependence in comparison with reported results obtained from DC electric field-induced second-harmonic generation and degenerate four-wave mixing measurements. A previously reported nonlinearity saturation for the extended oligomers was also not evident in the current study.
- Organic Chemistry
- Polymer Chemistry
- Electricity and Magnetism