Green synthesis, crystal structure, linear and nonlinear optical investigation of MgO1-xMnOx nanocomposite via Z-scan technique

[Display omitted] •(MgO)1-x(MnO)x nanocomposites are successfully synthesized by green method using Strach.•The experiments were repeated in three different values of x(x = 0, 0.05, 0.1).•The structural and morphological properties of samples were analyzed by XRD patterns and SEM images.•The band gap of samples obtained via DRS spectrum and decreased by increasing amount of x.•The Z-scan results showed the self-defocusing and saturable absorption phenomena in all samples. There is a wide range of refractory and electrical applications where magnesia is firmly established. In the current manuscript, the effect of MnO doping on linear and nonlinear optical traits of MgO was investigated. (MgO)1-x(MnO)x(x = 0,0.05,0.1) nanocomposites were synthesized via a green method using Starch powder. The XRD results showed that all the materials have a cubic structure with a lattice parameter of about 4.21 Å. The crystallite size decrease from 20.9 Å to 18.6 Å, as MnO content varied from 0 to 0.10. In addition, scanning electron microscopy showed a spherical morphology of (MgO)1-x(MnO)x, that increasing MnO component causes agglomaration. Increasing amount of × causes to decrease band gap of samples in which the Eg values for x = 0.00,0.05,and 0.10 were obtained 5.1,3.8,and 3.7 eV, respectively. The nonlinear optical properties of (MgO)1-x(MnO)x were evaluated using the Z-scan technique with a laser beam. Both nonlinear refractive index (10−8cm2/W) and nonlinear absorption (10−4cm/W) showed positive values, suggesting self-defocusing and saturable absorption. By increasing MnO component in (MgO)1-x(MnO)x nanocomposite, the nonlinear responses increase. According to interesting optical nonlinearity results of (MgO)1-x(MnO)x nanocomposites, it is a promising candidate for photonic and optical devises.