We report on the demonstration of surface-emitted terahertz- (THz-) wave difference-frequency generation from two-dimensional (2D) periodically poled lithium niobate (PPLN). The two orthogonal periodic structures individually compensate for both the phase mismatch of the launched lasers and the generated THz wave. Tunable 1.5–1.8 THz wave generation with a bandwidth of 10-GHz was obtained by use of two 2D PPLN crystals. We also confirmed that THz waves were simultaneously generated into two opposite directions, which suggests the possibility of higher THz-wave output power.
© 2005 Optical Society of America
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
Yuzo Sasaki, Yuri Avetisyan, Hiroyuki Yokoyama, and Hiromasa Ito, "Surface-emitted terahertz-wave difference-frequency generation in two-dimensional periodically poled lithium niobate," Opt. Lett. 30, 2927-2929 (2005)