**NONLINEAR OPTICS
OF FERROELECTRICS MATERIALS**

Junaidah Osman^{1},
T.Y. Tan^{1}, D.R. Tilley^{1}, Y. Ishibashi^{2}, and R.
Murgan^{1}

^{ }

^{1 }School of Physics, Universiti Sains

*11800 USM, *

^{2}Faculty of Communications, Aichi Shukutoku University, Nagakute-cho,
Aichi Prefecture 480-1197,

*Email: junaidah@usm.my*

Due to the existence of
spontaneous polarization below transition temperature *T _{C}* , ferroelectrics materials like BaTiO

Here, we explore these
possibilities. Based on the
Landau-Devonshire theory and the Landau-Khalatnikov dynamical equation, we
formalize a theory to calculate all the linear and nonlinear electric
susceptibility coefficients for bulk ferroelectrics materials by assuming that
they have tetragonal symmetry at temperature below *T _{C.}*. Based on
experimentally obtained parameter values for BaTiO

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