The tensorial second order optical nonlinearity of the epitaxial barium titanate (BaTiO3) thin films was characterized by second harmonic generation (SHG). The thin film was prepared by pulsed laser deposition (PLD). From the azimuthal-dependent SHG intensity, the ferroelectric a/c domain fraction ratio was resolved. The high second order optical nonlinearity enables (BaTiOs) thin film for applications in nonlinear integrated photonics.
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