Study of laser light polarization effect on the nonlinear refractive index of 5CB liquid crystal doped with anthraquinone dye in parallel alignment

In this experimental work, we have studied light polarization effects on the nonlinear refractive of dyed liquid crystal. Therefore, homogenously aligned Solvent Green 3 dye doped 5CB liquid crystal cells with 50 micrometer thickness were used and their nonlinearity were investigated using linear polarized He-Ne laser at 632 nm with polarization 0-90 degree with the director of cells. It was observed that in the parallel and orthogonal polarization of light relative of director the nonlinear refractive of samples is negative and positive respectively.