Abstract

The microscopic third-order nonlinear-optical susceptibility γ(− ω, ω, ω, − ω) 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 γ(− ω, ω, ω, − ω) is proportional to the population of the excited state.

© 1995 Optical Society of America

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