Abstract

Terahertz (THz) wave generation by periodically poled BaTiO₃ (PPBT) with a quasi-phase-matching (QPM) scheme based on cascaded difference-frequency generation (DFG) is theoretically analyzed. The cascaded DFG processes comprise cascaded Stokes and anti-Stokes processes. The calculated results indicate that the cascaded Stokes processes are stronger than the cascaded anti-Stokes processes. Compared to a noncascaded Stokes process, THz intensities from 20^th-order cascaded Stokes processes increase by a factor of 30. THz waves with a maximum intensity of 0.37 MW/mm² can be generated by 20^th-order cascaded DFG processes when the optical intensity is 10 MW/mm², corresponding to a quantum conversion efficiency of 1033%. The high quantum conversion efficiency of 1033% exceeds the Manley-Rowe limit, which indicates that PPBT is an excellent crystal for THz wave generation via cascaded DFG.

© 2018 Optical Society of Korea

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