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28 January 1987 Liquid Crystal Orientational Distribution Functions And Third Harmonic Generation
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Long range orientational order in a nematic liquid crystal phase is described by the orientation distribution function in the form of ascending Legendre functions <Pn> of even order n that are experimentally determined by measurements of the tensor components of a corresponding nth rank tensor physical property. We report new formalism and experimental results that demonstrate relationships between <P2>, <P4> and the third harmonic suscepti-bility of liquid crystal phases. The experimental system studied i 3) Oe well-known nematic liquid crystal MBBA. The microscopic third order response )0(-3w;w,w,w) of aligned MBBA samples was determined by third harmonic generation using t'Oe,Maker fringe wedge method. The measured polarization and temperature dependence of x°) are in good agreement with theory and with independent results from separate experimental studies of <P2> and <P4>.
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K Y Wong and A F Garito "Liquid Crystal Orientational Distribution Functions And Third Harmonic Generation", Proc. SPIE 0682, Molecular and Polymeric Optoelectronic Materials, (28 January 1987);

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