Second harmonic generation in an optically active liquid: Experimental observation of a fourth-order optical nonlinearity due to molecular chiralityстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Molecular left-right asymmetry is an origin of nonvanishing even-order optical nonlinear susceptibilities of nonracemic solutions of chiral molecules. Though second harmonic generation (SHG) due to quadratic dipolar nonlinearity is still symmetry forbidden in optically active liquids yet we have succeeded in experimental observation, for the first time, of noncollinear SHG due to a five-wave mixing process according to a scheme 2omega = 3omega - omega, governed by a fourth-order susceptibility tensor chi(4)D. The SHG signal is found to be well collimated and quasi-phase-matched; it shows theoretically predicted polarization, intensity, spectral, and temporal properties.