Abstract
Phase-matched nonlinear wave mixing, e.g., second-harmonic generation (SHG), is crucial for frequency conversion for integrated photonics and applications, where phase matching wavelength tunability in a wide manner is important. Here, we propose and demonstrate a novel design of angle-cut ridge waveguides for SHG on the lithium niobate-on-insulator (LNOI) platform via type-I birefringent phase matching (BPM). The unique strong birefringence of LN is used to achieve flexible temperature tuning. We experimentally demonstrate a normalized BPM conversion efficiency of 2.7%W−1cm−2 in an angle-cut LN ridge waveguide with a thermo tuning slope of 1.06 nm/K at the telecommunication C band. The approach effectively overcomes the spatial walk-off effect and avoids the need for periodic domain engineering. Furthermore, the angle-cut ridge waveguide scheme can be universally extended to other on-chip birefringent platforms where domain engineering is difficult or immature. The approach may open up an avenue for tunable nonlinear frequency conversion on integrated photonics for broad applications.
© 2022 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Yongzhi Tang, Tingting Ding, Chuanyi Lu, Jing Qiu, Yuting Zhang, Yiwen Huang, Shijie Liu, Yuanlin Zheng, and Xianfeng Chen
Opt. Lett. 48(5) 1108-1111 (2023)
Tingting Ding, Yongzhi Tang, Hao Li, Shijie Liu, Jing Zhang, Yuanlin Zheng, and Xianfeng Chen
Opt. Lett. 49(5) 1121-1124 (2024)
Jia-Yang Chen, Chao Tang, Zhao-Hui Ma, Zhan Li, Yong Meng Sua, and Yu-Ping Huang
Opt. Lett. 45(13) 3789-3792 (2020)