Abstract
A series of the organic-inorganic nonlinear optical (NLO) materials based on the melamine prepolymers containing azobenzene dye as NLO chromophore and an alkoxysilane prepolymer have been investigated. The NLO-active melamine prepolymers were blended with the alkoxysilane prepolymer at various weight ratios. Excellent compatibility between two components was obtained for this all sol-gel type material due to the simultaneous polymerizations, and hydrogen bonding interactions among the residual hydroxyl and silanol groups after curing. Dielectric results indicates that the thermal behavior of the melamine-based NLO material has been improved when blended with 25 wt % alkoxysilane. This series of all sol-gel materials exhibit large second-order optical nonlinearity (d33 = 9∼30 pm/V at 1064 nm, and 3∼10 pm/V at 1542 nm) after poling and curing at 220 °C for 1 h. Moreover, the temporal stability of the effective second harmonic coefficient at 100 °C is also reported.
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