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Stability of high-Tg polyimide planar waveguides

The planar waveguides have been successfully fabricated using polyimide as host in guest-host thin films. The stability of the poled film by corona-onset poling at elevated temperature is investigated. By measuring small changes in the refractive-index anisotropy, the optical waveguiding technique is demonstrated to be a sensitive measure of the poling-induced order. Second-harmonic generation experiments are performed to measure the decay of second-order nonlinearity.