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Updated: Jun 19, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Excited-state enhancement of the third-order nonlinear optical susceptibility of nonether polyphenylquinoxaline
Abstract:
The microscopic third-order nonlinear-optical susceptibility gamma(-omega; omega, omega, -omega) of a conjugated polymer, nonether polyphenylquinoxaline, was observed to be enhanced by two times from 355-nm optically pumped excited-state populations under the condition of unsaturated pumping. We studied the time evolution of the enhancement and verified by a fluorescence measurement that the excited-state enhancement of gamma(-omega; omega, omega, -omega) is proportional to the population of the excited state.
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