Abstract
Dye-doped nematic liquid crystal samples where the vector director is not pre-aligned exhibits simultaneously positive and negative nonlinear refractive index under cw illumination at room temperature, regardless the polarization state of the illuminating beam. However, its relative contributions are polarization dependent. Experimental Z-scan curves for 100 μm thick methyl red doped 5CB nematic liquid crystals, demonstrate that negative nonlinearity is an order of magnitude larger than the positive. The polarization state of the transmitted beam is change to elliptical carrying information about the positive and negative nonlinearities.
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