Estudio de los mecanismos de absorción, dispersión y propagación de la señal de mezcla de Cuatro Ondas en colorantes orgánicos dentro de medios condensados en un modelo basado en el formalismo de la matriz de densidad

Abstract

The present research shows a study of the nonlinear optical properties and the propagation of the signal of four wave mixing (FWM) in a molecular system considering effects of saturation of the probe beam to the second order. The formalism of the density matrix was applied to the molecular system (organic dye Green Malachite) of two electronic levels immersed in a thermal reservoir interacting with two electromagnetic fields, high and low intensity, known as pumping beam and probe beam, respectively. Using the Optical Stochastic Bloch Equations (OSBE) we calculated the induced polarization in the system and analyzed the nonlinear optical properties and the propagation of the signal. The absorption and dispersion profiles associated with the nonlinear optical properties of the system were studied and finally the propagation of the signal through intensity profiles was studied in three different approaches, two of them analytical solutions and the other numerical one. These results were compared under the solvent-induced effects, chemical concentration of the solution, field intensities and pumping beam saturation.