PICOSECOND 3RD-ORDER NONLINEAR OPTICAL SUSCEPTIBILITY IN NEMATIC LIQUID-CRYSTALS
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We have measured the tensor components c1111 and c 1221 of third-order nonlinear optical susceptibility of two nematic liquid crystals, MBBA (p-methoxy-benzylidene p-n-butylaniline) and EBBA (p-ethoxy-benzylidene p-n-butylaniline), in the picosecond regime. We observed that the molecule with ethoxy group (EBBA) has a larger third-order nonlinearity than the one with methoxy group (MBBA) and present a model to explain this effect.