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Proceedings Paper

Theoretical study of optical pockels and Kerr coefficients of polyenes
Author(s): I. D. L. Albert; S. Ramasesha
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Paper Abstract

We report here the numerically exact Pockels' and Kerr's coefficients of polyenes within the Pariser-Parr Pople Model. We have computed the model exact polarizability of polyenes ot chain length, N=6,8 and 10 at various static electric fields and excitation frequencies. From a 3rd degree polynomial fit of the model exact polarizability 1(Q;Q,O) (linear term) and t(Q;Q,O,O) (2nd order term) are obtained. The Pockels and Kerr coefficients are calculated from J and t. In polyenes the Pockels coefficients are small and the Kerr coefficients dominate and are the largest when the field is applied along the chain axis. The coefficients, a(Q;Q), 1(Q;Q,O) and t(Q;Q,O,O) all increase with chain length. a(Q;Q)and t(Q;Q,O,O) have the usual power law dependence and have exponent values as 1.54 and 3.78 respectively which are in agreement with the values reported in the literature. The coefficients a(Q;Q), .(Q;Q,O) and t(Q;Q,O,O) increases with increase in the excitation frequency, for frequencies below the two photon resonance value.

Paper Details

Date Published: 1 March 1991
PDF: 11 pages
Proc. SPIE 1436, Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films, (1 March 1991); doi: 10.1117/12.27451
Show Author Affiliations
I. D. L. Albert, Indian Institute of Science (India)
S. Ramasesha, Indian Institute of Science (India)

Published in SPIE Proceedings Vol. 1436:
Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films
Marcus F. Lawrence; Arthur Jesse Frank; S. Ramasesha; Carl C. Wamser, Editor(s)

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