Re-evaluation of the thermal stability of optically nonlinear polymeric guest-host systems

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Abstract
Guest‐host polymer systems with potential use in electro‐optic devices are discussed. The polymer host is a polyimide and the guest chromophores are 2,4,5‐triarylimidazoles (lophines). Poling stabilities have been obtained by extrapolating the second harmonic generation decay using a stretched exponential function and extrapolated lifetimes greater than a year at 80 °C have been obtained. In addition, an apparent relationship between the stability of poled order and the glass transition temperature is discussed.