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VOLUME 51 (1990) | ISSUE 7 | PAGE 364
Optically induced deviation from central symmetry; lattices of quadratic nonlinear susceptibility in a nematic liquid crystal
An increase in the efficiency of second-harmonic generation by a factor of more than 300 has been observed in the nematic liquid crystal 5CB during excitation of a spatially periodic В deformation in it by the light from a free-running ruby laser. Synchronous second-harmonic generation can be achieved for the oo -* о interaction by varying the spatial period of the deformation. The effect is attributed to a local elimination of the inversion center, as in the flex effect.