Spectral and third non-linear properties for mixture solutions of (R6G, RB, and RC)‎ dyes

Abstract EN

In this research, the spectral characteristics and the nonlinear optical properties for the mixing of Rhodamine dyes (Rh6G, RC, and RB) were determined at different concentrations ( 1 × 10-5, 2 × 10-5, 5 × 10-5, 7×10-5, and 1×10-4 mole / L) at room temperature.

The spectral characteristics were studied by recording their absorption and fluorescence spectra.

The intensity of absorption increased and fluorescence decreased when increasing concentration which in agreement with Beer – Lambert Law.

It was observed that this mixing had a wide spectral range.

The quantum efficiency decreased while the radiative life time and the fluorescence life time increased when increasing the concentration.

Nonlinear optical properties were measured by using Z-Scan technique, using (CW) continuous Nd: YAG laser with frequency doubled wavelength (532nm) with output power (100 mW).

The obtained nonlinear properties results of the mixture (R6G, RC, and RB) showed a negative nonlinear refractive index for concentrations (7×10-5, and 1×10-4 mole / L ) while the concentrations (1×10-5, 2 × 10-5, and 5 × 10-5 mole / L ) showed a positive nonlinear refractive index, also this mixing showed two photon absorption behavior for all concentrations.

The origin of optical nonlinearity in the dye may be attributed to laser-heating induced nonlinear effect.