Nonlinear optical properties and optical power limiting of Leishman dye using z-scan technique

Abstract

The third-order nonlinear optical properties of Leishman dye in ethanol at different concentrations for two different incident laser intensities were investigated. The z-scan technique with continuous wave solid-state laser operating at 532 nm wavelength was employed to measure the sign and magnitude of the nonlinear refractive index (n₂) and the nonlinear absorption coefficient (β) of Leishman dye. The real and imaginary parts of the third-order nonlinear optical susceptibility (χ⁽³⁾) were determined. The experimental results show that the investigated Leishman dye exhibits saturation absorption and negative nonlinear refraction (self-defocusing). The optical power limiting behavior was also investigated for the Leishman dye solution at different concentrations. The results show that the Leishman dye is a good nonlinear material with large nonlinear response could be used as a potential material for devices in optical applications.