3D04 ホスト・ゲスト液晶における高次非線形光学効果

抄録

We characterized a self-phase modulation that originated in photothermal effects in host-guest liquid crystals. The experimental diffraction beam patterns were in good agreement with those calculated using Kirchhoff's diffraction integral including higher-order nonlinear optical effects. Intensity (I)-dependent refractive-index change (δn) can be expressed as δn=n_2I+n_4I^2, where n_2 and n_4 are nonlinear optical coefficients. In our host-guest liquid crystals, n_2 and n_4 were estimated to be -0.90×10^<-7> and -1.42×10^<-13>, respectively. In addition, these nonlinear optical coefficients were strongly dependent on nematic-isotropic transition temperatures.