Theoretical study of optical pockels and Kerr coefficients of polyenes

I. D. L. Albert; S. Ramasesha

doi:10.1117/12.27451

1 March 1991 Theoretical study of optical pockels and Kerr coefficients of polyenes

I. D. L. Albert, S. Ramasesha

Proceedings Volume 1436, Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films; (1991) https://doi.org/10.1117/12.27451
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

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.

Citation Download Citation

I. D. L. Albert and S. Ramasesha "Theoretical study of optical pockels and Kerr coefficients of polyenes", Proc. SPIE 1436, Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films, (1 March 1991); https://doi.org/10.1117/12.27451

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