Nonlinear optical responses and limiting behavior of sulfadiazine-chromotropic acid azo dye

The nonlinear optical properties of a new azo dye (1.8-Dihydroxy-naphthalin-3,6 disulfonic acid-[2-(4-azo)]-N-(2-pyrimiding)-benzene sulfonamide) in Dimethyl sulfoxide solvent were studied by Z-scan technique using cw diode laser at 532 nm. The nonlinear absorption coefficient and the nonlinear refractive index of the dye were calculated using the open aperture Z-scan and the closed aperture Z-scan techniques respectively. The sample showed a negative and large nonlinear refractive index value of , and reverse saturable absorption with high value of nonlinear absorption coefficient equal to . Diffraction ring patterns were generated in the azo dye sample under cw laser beam irradiation together with optical limiting of the azo dye solution was demonstrated. These results indicate that the new dye is a promising candidate for applications in nonlinear optical devices.