2ND-HARMONIC GENERATION IN FERROELECTRIC LIQUID-CRYSTAL MIXTURES

The concentration dependence of the second harmonic generation efficie ncy has been analyzed in binary mixtures containing a ferroelectric li quid crystal material (W313) with high spontaneous polarization and an achiral host. It has been found that the effective nonlinear coeffici ent is not, in general, proportional to the mixture mole fraction, alt hough it is linearly correlated to the spontaneous polarization. Far f rom the transition to the chiral smectic C phase, both quantities disp lay the same temperature dependence.