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Best stochastics model for percentage of transmittance of lithium niobate affected by wavelength of visible light

Abstract Lithium niobate is most well-known of optical material and could be characterised using stochastic spline regression. The aimed of this research is to find the best spline regression based on percentage of transmittance of lithium niobate and wavelength at three concentrations of ruthenium oxide (0%, 2%, and 4%) and to learn the behaviour of transmittance of lithium niobate if wavelength of visible light change with spline regression. The results show that spline quadratic regression with three knots are the best model for all concentration of ruthenium oxide, since the model can follow actual data accurately with R2 more than 90%.