Abstract
In a centrosymmetric medium even-order optical effects [such as second-harmonic generation, (SHG)] are dipolar forbidden for symmetry reasons. However, fourth-order dipolar nonlinearity does permit the SHG of linearly polarized beams to occur in a nonracemic isotropic solution of chiral molecules, in a phase-matched, noncollinear scheme,1 quadratic dipolar SHG still being forbidden by permutation symmetry.
© 1993 Optical Society of America
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