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13 September 2007 Modeling and prediction of relaxation of polar order in high-activity nonlinear optical polymers
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Abstract
Mach-Zehnder optical modulators were fabricated using the CLD and FTC chromophores in polymer-on-silicon optical waveguides. Up to 17 months of oven-ageing stability are reported for the poled polymer films. Modulators containing an FTC-polyimide had the best over all aging performance. To model and extrapolate the ageing data, a relaxation correlation function attributed to A. K. Jonscher was compared to the well-established stretched exponential correlation function. Both models gave a good fit to the data. The Jonscher model predicted a slower relaxation rate in the out years. Analysis showed that collecting data for a longer period relative to the relaxation time was more important for generating useful predictions than the precision with which individual model parameters could be estimated. Thus from a practical standpoint, time-temperature superposition must be assumed in order to generate meaningful predictions. For this purpose, Arrhenius-type expressions were found to relate the model time constants to the ageing temperatures.
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Andrew J. Guenthner, Geoffrey A. Lindsay, Michael E. Wright, Stephen Fallis, Paul R. Ashley, and Mohan Sanghadasa "Modeling and prediction of relaxation of polar order in high-activity nonlinear optical polymers", Proc. SPIE 6653, Linear and Nonlinear Optics of Organic Materials VII, 66530O (13 September 2007); https://doi.org/10.1117/12.734436
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