ABSTRACT
Second-order nonlinear optical copolymers containing methylmethacrylate (MMA), p-hydroxyphenyl maleimide (HPMI) or glycidylmethacrylate (GMA) as a comonomer were newly synthesized. Second-order nonlinear optical properties of the poled or poled/cured films were investigated in terms of the second harmonic generation (SHG) and linear electro-optic (EO) coefficient measurement. Second-order NLO coefficient, d 33 and EO coefficients, r 33 were also measured at 1064 and 632 nm wavelength, which were significantly high. To prevent the molecular relaxation of poled polymer, thermal crosslink reaction was induced either using diisocyanate as a crosslinker or by virtue of self-crosslinking reaction between the side chains themselves. Temporal stabilities of second-order NLO coefficients of crosslinked polymer systems were proved much better than those of other side chain polymers.
