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Molecular structure (a) and absorption spectrum (b) of the thermal-cross-linking polyurethane with DR19. Cross-linking of the polyurethane was carried out through a thermal chemical reaction between the hydroxyl (OH) groups of the cross-linker and the cyanate (CNO) groups of the prepolymer.
Decays of the photoinduced SHG of a azopolyurethane film (no cross-linker) (a) and a film (b), which were seeded optically at room temperature and , respectively. All measurements for SHG decays were performed at room temperature.
Dependence of optical poling of the films on the sample temperature. The films were seeded optically at different temperatures and then cooled to room temperature to measure SHG signals.
(Color online) Dependence of the photoinduced SHG on the film thickness (a) and the beam pattern of the SHG signal (b). All films were seeded optically at and then were cooled to room temperature to measure SHG signals. Log-log plots with a linear fit of a slope near 2 display SHG intensity dependence on the square of the film thickness.
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