We report our second-harmonic generation study of a new crosslinked main-chain polymer system for second-order nonlinear optics (NLO). In this unique polymer system, the rigid second-order NLO chromophores are randomly bonded in the main chain with flexible links between the rigid chromophores to allow electric poling at or above the glass transition temperature. A thermal crosslinker is added to crosslink the polymer backbone during electric poling. The combination of the flexible chain segments and crosslinking allows us to achieve a high degree of alignment (〈cos3θ〉≊0.34) and long-term (≳2500 h) temporal stability of the nonlinearities.
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Ranon et al. (1993) studied this question.
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