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Second order nonlinearity and laser-induced optical properties of nonlinear optical materials
Abstract
Orientational order Parameters induced in polymer guest/host systems consisting of nonlinear optical chromophores have been investigated by using the electrochromic and second harmonic generation techniques. The Pockels electro-optical coefficient is calculated from the electrochromic data and compared with that deduced from the second harmonic generation results. Real time elctrochromism and second harmonic generation signal decay curves are measured. Fundamental differences between electrochromic and second harmonic processes as well as effects due to surface trapped charges are discussed. The hyper-Rayleigh scattering (HRS) technique is used to measure the first hyperpolarizability. The dimerization effect on the first hyperpolarizablity has been discussed. Depolarization ratio was also measured to investigate the concentration effects on the first hyperpolarizability. The effects of two photon fluorescence and the polymerization on the first hyperpolarizability have been measured and discussed. The optically induced birefringence in an azobenzene functionalized polymer and in an azobenzene guest/host polymer system have been studied. The temperature dependence of the signal is studied and the possible mechanisms associated from the growth and decay segments are analyzed. The laser induced holographic grating at room temperature has been measured. The dependencies of the temperature and the polarization have been studied and the possible mechanism has been suggested.
Subject Area
Chemistry
Recommended Citation
Song, Ok-Keun, "Second order nonlinearity and laser-induced optical properties of nonlinear optical materials" (1997). ETD collection for University of Nebraska-Lincoln. AAI9812360.
https://digitalcommons.unl.edu/dissertations/AAI9812360