Abstract
Lithium niobate (LN) thin film has recently emerged as an important platform for nonlinear optical investigations for its large χ(2) nonlinear coefficients and ability of light localization. In this Letter, we report the first, to the best of our knowledge, fabrication of LN-on-insulator ridge waveguides with generalized quasiperiodic poled superlattices using the electric field polarization technique and microfabrication techniques. Benefiting from the abundant reciprocal vectors, we observed efficient second-harmonic and cascaded third-harmonic signals in the same device, with normalized conversion efficiency of 1735% W−1 cm−2 and 0.41% W−2 cm−4, respectively. This work opens a new direction for nonlinear integrated photonics based on LN thin film.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Xiao Wu, Li Zhang, Zhenzhong Hao, Ru Zhang, Rui Ma, Fang Bo, Guoquan Zhang, and Jingjun Xu
Opt. Lett. 47(7) 1574-1577 (2022)
Chuanyi Lu, Yuting Zhang, Jing Qiu, Yongzhi Tang, Tingting Ding, Shijie Liu, Yuanlin Zheng, and Xianfeng Chen
Opt. Lett. 47(5) 1081-1084 (2022)
Jia-Yang Chen, Chao Tang, Zhao-Hui Ma, Zhan Li, Yong Meng Sua, and Yu-Ping Huang
Opt. Lett. 45(13) 3789-3792 (2020)