The quasi-periodic optical superlattice is a promising material for use in optical frequency conversion. We propose a method for designing a quasi-periodic structure for efficient third-harmonic generation (THG) at any given wavelength. With this method we have made a LiTaO3 sample in which 27% THG at 0.48µm was achieved, together with a series of highly efficient multiwavelength second-harmonic generation outputs. The result is in good agreement with the theoretical prediction.
© 2001 Optical Society of America
(140.7300) Lasers and laser optics : Visible lasers
(160.2260) Materials : Ferroelectrics
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
Chao Zhang, Hong Wei, Yong-Yuan Zhu, Hui-Tian Wang, Shi-Ning Zhu, and Nai-Ben Ming, "Third-harmonic generation in a general two-component quasi-periodic optical superlattice," Opt. Lett. 26, 899-901 (2001)