Nonlinear optical properties and diffraction ring patterns of benzo congo red

Ketamm Abd AL-Adel, Hussain A.

Abstract

The nonlinear optical properties of Benzo congo red in Dimathyl sulfoxide (DMSO) solvent and polymer were studied using single beam Z-scan technique with a continuous-wave radiation at 532 nm of an output power of 40 mW. All the solution samples and polymer showed large nonlinear refractive indexice and absorption coefficient of the order of 10-8 cm2/W and 10-3 cm/W, respectively. The concentration-dependent nonlinear refractive index was also investigated. We presents experimental evidences of observing diffraction pattern in congo red dye: DMSO solvent with the calculation of the refractive index change, Δn , the relative phase shift, DF , and effective nonlinear refractive index ,n2. The solvent of spectroscopic grade and was used without further purification. All the solutions used for the study were freshly prepared.