RELAXATION IN PMMA FILMS DOPED WITH ANILINE DERIVATIVES FOR NONLINEAROPTICS

Dynamic viscoelastic spectra, thermally stimulated current, optical ab sorption spectra and second harmonic generation (SHG) intensity have b een measured in poled films of PMMA doped with aniline derivatives. Th ese experiments have indicated that the volume, axial ratio and dipole moment of the dopant molecules, and doping level have significant inf luences on the stability of SHG of the poled polymers. A mechanism bas ed on free volume theory is proposed which interprets the experimental observations satisfactorily.