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Abstract
The second harmonic generation (SHG) in the ferroelectric liquid crystal (FLC) has been studied as functions of electric field strength, sample thickness, rotating angle, temperature and molecular structure. A sharp angular phase-matching curve of the SHG controlled by an electric field is observed even in the liquid crystal. The temperature dependences of the phase-matched SHG and Maker fringe in the ferroelectric phase have also been studied and nonlinear optical coefficients are obtained as a function of temperature. The SHG in several kinds of FLCs is measured in the Sm C* and crystalline phase. Anomalous temperature dependence of the SHG is also observed in DOBA-1-MPC.
