Simsek S.Koc, H.Palaz S.Oltulu, O.Mamedov, A. M.Özbay, Ekmel2016-02-082016-02-0820150015-0193http://hdl.handle.net/11693/23314The nonlinear optical properties and electro-optic effects of some oxygen-octahedra ferroelectrics are studied by the density functional theory (DFT) in the local density approximation (LDA) expressions based on first principle calculations without the scissor approximation. We present calculations of the frequency- dependent complex dielectric function and the second harmonic generation response coefficient over a large frequency range in tetragonal and rhombohedral phases. The electronic linear electro-optic susceptibility is also evaluated below the band gap. These results are based on a series of the LDA calculation using DFT. The results for are in agreement with the experiment below the band gap and those for are compared with the experimental data where available. © 2015 Taylor & Francis Group, LLC.EnglishABO3FerroelectricsNonlinear optic processesDensity functional theoryEnergy gapFerroelectric materialsHarmonic generationLocal density approximationOptical propertiesComplex dielectric functionsElectrooptic effectsFirst principle calculationsLinear electro-opticsNon-linear optical propertiesResponse coefficientTetragonal and rhombohedral phasisNonlinear opticsArticle10.1080/00150193.2015.10586681563-5112