Nonlinear optical properties of carboxymethyl starch nanocomposite by Z-scan technique using a Nd-YAG laser

摘要

In this paper, the third-order nonlinear optical properties of modified nanocomposite carboxymethyl starch are presented. The nanocomposite of carboxymethyl starch has been synthesized by a chemical technique. X-ray diffraction and scanning electron microscopy were used to study its crystal structure. Linear optical response of this sample was studied by using UV-Visible spectroscopy. Nonlinear refraction and absorption coefficients of the nanocomposite were measured in two different solvents, dimethylformamide and N-methylpyrrolidone, by Z-scan method using a continuous wave Nd-YAG laser at 532 nm. The measured values of nonlinear refraction in both of the solutions were from the order of .