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Third-order optical spectroscopy of polythiophene

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Abstract

Tunable third-harmonic generation and nondegenerate four-wave mixing experiments were performed on polythiophene thin films to produce six independent nonlinear-optical spectra. An essential states model consisting of three electronic excited states has been compared with the spectra. Inclusion of a Raman state could improve the fit to two of the spectra.

© 1995 Optical Society of America

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