Abstract
Poling-condition dependence of second-order optical nonlinearity of a polyurethane sample has been studied by the second-harmonic generation (SHG) method. Not only the magnitude of an SHG coefficient (d31) but also the temporal stability of d31 depended on the poling conditions. The dependence of the temporal stability was weaker than that of the magnitude. The poling temperature (Tpol) affected the stability more than the poling voltage, the poling time and the preheating time. The Tpol leading to the best temporal stability agreed approximately with that leading to the highest d31. The dependence of the temporal stability is discussed from the viewpoint of molecular dynamics.
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