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Nonresonant third-order susceptibility measurements in the nematic liquid crystal K18

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Abstract

We have observed a large nonresonant third-order nonlinear susceptibility, X (3) (-ω; ω, 0, 0) in the isotropic phase of a nematic liquid crystal 4′-n-hexyl-4-cyanobiphenyl (K18). The highest value of X (3) obtained at 632.8 nm is 1.16274×10-18 m2V-2 corresponding to a temperature 29.3°C. The observed second-order pretransitional temperature T * from our measurements is 1.2°C below the first-order nematic to isotropic transition temperature. The dependence of the Kerr constant on (T-T *)-1 is found to be in good agreement with the predictions of the Landau-de Gennes model.

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Authors and Affiliations

  1. Laser Laboratory, Department of Physics, Indian Institute of Technology, 600 036, Madras, India

    John Philip & T. A. Prasada Rao

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  1. John Philip
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  2. T. A. Prasada Rao
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Philip, J., Prasada Rao, T.A. Nonresonant third-order susceptibility measurements in the nematic liquid crystal K18. Opt Quant Electron 25, 157–162 (1993). https://doi.org/10.1007/BF00420760

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