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In this paper, the nonlinear properties of Fluorescein Sodium C20H10Na2O5 have been studied. This compound was solved in water with variable concentrations of (1 ×10, 2 ×10, 5 ×10, 7 ×10, 1 ×10 ), and in a fixed thickness of 1 mm. The Method of (Z-Scan) was used to evaluate the samples. The results represent that the nonlinear refractive index n2 and the absorption nonlinear coefficient β. It is found that the nonlinear coefficient changes with increasing the concentrations Where the nonlinear coefficient increasing with increasing the concentrations.

The Study of Non-Linear Properties for Fluorescein Sodium Dye in Water