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http://dx.doi.org/10.3807/COPP.2018.2.3.261

Terahertz Wave Generation via Stimulated Polariton Scattering in BaTiO3 Bulk Crystal with High Parametric Gain  

Li, Zhongyang (College of Electric Power, North China University of Water Resources and Electric Power)
Yuan, Bin (College of Electric Power, North China University of Water Resources and Electric Power)
Wang, Silei (College of Electric Power, North China University of Water Resources and Electric Power)
Wang, Mengtao (College of Electric Power, North China University of Water Resources and Electric Power)
Bing, Pibin (College of Electric Power, North China University of Water Resources and Electric Power)
Publication Information
Current Optics and Photonics / v.2, no.3, 2018 , pp. 261-268 More about this Journal
Abstract
Stimulated polariton scattering (SPS) from the $A_1$ transverse optical (TO) modes of $BaTiO_3$ 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 $BaTiO_3$ 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 $BaTiO_3$ are theoretically simulated. The THz phonon flux densities generated via SPS in $BaTiO_3$ are theoretically calculated by solving the coupled wave equations under the NPM condition. The PM characteristics and THz-wave parametric gain characteristics in $BaTiO_3$ are compared to those in $MgO:LiNbO_3$. The results of the analysis indicate that $BaTiO_3$ is an attractive optical crystal for efficient THz wave generation via SPS.
Keywords
Terahertz wave; Stimulated polariton scattering; $BaTiO_3$;
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