Polyurethanes having high hyperpolarizability densities and other favorable properties can be easily prepared from nonlinear optical active diols (NLO-diols) of a certain general formula, which have a delocalized .pi. electron system to which both an electron donor group and an electron acceptor group are coupled directly (D.pi.A system). The polyurethanes may be used in optical waveguides.
具有高超极化密度和其他有利性质的聚
氨酯可以从某种一般公式的非线性光学活性二元醇(NLO-二元醇)中轻松制备,该公式具有离域的π电子系统,其中电子给体基团和电子受体基团直接耦合(D.π.A系统)。聚
氨酯可用于光波导。