Multi-month thermal aging of electro-optic polymer waveguides: Synthesis, fabrication, and relaxation modeling |
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Authors: | Geoffrey A Lindsay Andrew J Guenthner Mohan Sanghadasa |
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Affiliation: | a U.S. Navy, NAVAIR, Chemistry Division, China Lake, CA 93555-6100, USA b The AEgis Technologies Group, Inc., Huntsville, AL 35806, USA c U.S. Army, AMRDEC, RD&E Command, Redstone Arsenal, AL 35898, USA |
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Abstract: | The preparation of polyimides containing side-chain chromophores and the long-term aging performance of poled films are described. These materials were compared to guest-host polycarbonate films. Mach-Zehnder optical interferometers were fabricated from these polymers that contained CLD- and FTC-type chromophores. Changes in optical properties were monitored for months at four temperatures ranging from ambient to 110 °C. The isothermal relaxation data were modeled using both a stretched exponential equation and a power law in time equation. The temperature dependency of the time constants of these equations was modeled using a new activation-energy equation: ln(τ/τp) = ER(1 + tanh(Tc − T)/D])/2RT + Ep/RT where Tc is the central temperature of the transition zone, D is the breadth of the zone, and Es are the activation energies of rigid and pliable materials. Multi-year high-temperature stability of the poled guest-host and side-chain materials was predicted. |
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Keywords: | Aging Chromophore Nonlinear optic |
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