Nonlinear Refractive Index Measurements of Isotropic Liquid Crystals.
ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (ENGLAND)
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We have measured the nonlinear refractive index of a number of liquid crystalline materials in the isotropic phase. These materials show strong enhancement of the nonlinearity due to nematic like local ordering, and even materials which do not have a nematic-isotropic transition show this enhancement. We also studied mixtures of liquid crystals and solvents and find that these mixtures also have an enhanced nonlinearity due to local ordering. Absorption of the laser beam causes expansion which reduces the refractive index and can counteract the refractive index change due to reorientation. Author