Synthesis and study the optical nonlinear properties of polypyrrole and poly(vinyl acetate) copolymer

Poly [pyrrole-co-(vinyl acetate)] is prepared via chemical polymerization method. Obtained copolymer is characterized by Fourier transform infrared (FTIR) and thermal gravimetric analysis (TGA). The nonlinear optical properties of this copolymer are studied using the diffraction ring patterns and the Z-scan techniques using 473 nm wavelength laser beam. The total change in the copolymer index of refraction and nonlinear index of refraction are determined via the first technique while the nonlinear refractive index is determined via the second technique. The property of optical limiting of the copolymer is investigated where it is found that this medium possess optical limiting with limiting threshold of 14 mW is obtained. The diffraction rings patterns are simulated numerically via the diffraction integral of Fresnel-Kirchhoff with reasonable agreement compare to the experimental findings. (author)