Abstract
Nonlinear optics to study various phenomena in which the optical properties of the material changes in the presence of light. Polarization of a material system depends non-linearity upon the strength of the applied optical field in this mediums. The Z-scan technique is the best method that by this method we can determine nonlinearity optical properties namely, nonlinearity refraction index and nonlinearity absorption coefficient in the present of high-intensity lights. It should be noted that the advantage of the Z-scan method than the other methods is, that by this method can determined the nonlinearity optical properties with precision and simultaneously. We were determined the nonlinear refraction index and nonlinear coefficient of 'PbS' that suspended in alcohol by coding in fortran environment
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