Abstract

Stimulated polariton scattering (SPS) from the A1 transverse optical (TO) modes of BaTiO₃ bulk crystal generating a terahertz (THz) wave with the noncollinear phase-matching (NPM) condition is theoretically investigated. To our best knowledge, this is the first report on THz wave generation from BaTiO₃ bulk crystal via SPS. Phase-matching (PM) characteristics in the NPM configuration are analyzed. Effective parametric gain lengths for the Stokes and THz waves in the NPM configuration are calculated. The effective parametric gain coefficient and absorption coefficient of the THz wave in BaTiO₃ are theoretically simulated. The THz phonon flux densities generated via SPS in BaTiO₃ are theoretically calculated by solving the coupled wave equations under the NPM condition. The PM characteristics and THz-wave parametric gain characteristics in BaTiO₃ are compared to those in MgO:LiNbO₃. The results of the analysis indicate that BaTiO₃ is an attractive optical crystal for efficient THz wave generation via SPS.

© 2018 Optical Society of Korea

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