Abstract
The second harmonic generations (SHG) of liquid crystalline main-chain type polymers were investigated. The sample polymers are copolymers of 2-hydroxy-6-naphtoic acid (HNA) with 4-hydroxy-benzoic acid (PHB), in various composition ratios. SHGs for the samples by applying electric fields in some different manners at the liquid crystalline temperature were prepared. The nonlinear optical coefficients dexp evaluated by Maker Fringe Method of electrically poled samples are 2–3 times larger than that of mechanically oriented sample whose dexp is about 5pm/V. Quasi-Phase Matching (QPM) was performed by piling mechanically oriented thin films with alternatively directed machine direction. Using liquid crystals (nematic) as the spacer between films and surfaces and tuning refractive index of the liquid crystals by applying adequate electric field, SH intensity increased up to 12–15 times that of one sheet of film.
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