1 September 1991 Excited-state nonlinear optical processes in polymers
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Proceedings Volume 1497, Nonlinear Optics and Materials; (1991) https://doi.org/10.1117/12.46798
Event: Southcentral '91 (Dallas), 1991, Dallas, TX, United States
Abstract
In atoms and molecules, nonresonant second-order and third-order optical processes mediated by virtual electronic excitations are described by their second-order (beta) ijk(-(omega) 3;(omega) 1,(omega) 2) and third-order (gamma) ijkl(-(omega) 4;(omega) 1,(omega) 2,(omega) 3) optical susceptibilities, respectively. In general, the real population of the initial state for the virtual electronic excitations can be either the usual singlet ground state S0 or an optically pumped excited state Sn. The authors have found for quasi-one (1-D) and quasi-two (2-D) dimensional chain-like and disc-like structures, compared to the ground state, the nonresonant excited state (beta) ijkSn(-(omega) 3;(omega) 1,(omega) 2) or (gamma) ijklSn(-(omega) 4;(omega) 1,(omega) 2,(omega) 3) can markedly increase, and even change sign, when the first (S1) or second (S2) (pi) -electron excited state is optically pumped and populated for timescales sufficiently long to allow nonresonant measurements of (beta) ijkSn(-(omega) 3;(omega) 1,(omega) 2) or (gamma) ijklSn(-(omega) 4;(omega) 1,(omega) 2,(omega) 3).
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James Randy Heflin, Qihou L. Zhou, Anthony F. Garito, "Excited-state nonlinear optical processes in polymers", Proc. SPIE 1497, Nonlinear Optics and Materials, (1 September 1991); doi: 10.1117/12.46798; https://doi.org/10.1117/12.46798
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