Experimental and computational study of nonlinear optical behavior of rasazurin sodium salt with different dye concentrations
摘要
This work reports the third-order nonlinear optical (NLO) features of rasazurin sodium salt with varying concentrations from 0.01 to 0.04 mM. The NLO features of rasazurin sodium salt is studied using diode laser operating at 650 nm wavelength with an input intensity at 1.123 kW/cm2. The rasazurin sodium salt shows self-defocusing and saturable absorption (SA) behavior in all dye concentrations and measured to be the order of 10–7 cm2/W and 10–3 cm/W. In organic dyes, thermal nonlinearity is more predominant for self-defocusing effect and the thermo-optic coefficient of the dye is found to be of the order of 10–4 K−1. The dye exhibited significant NLO parameters at 0.04 mM concentration and the third-order NLO susceptibility is measured to be 4.08 × 10–7 esu. The determination of NLO properties, including linear polarizability (α), first-order hyperpolarizability (β), and second-order hyperpolarizability (γ), of rasazurin sodium salt is computed using DFT calculations. These theoretical estimations offer important insights into the dye's potential for advanced NLO applications since they are compatible with the experimental results.