Cai JiaChen, Wang Pi-Yu, Li Jin, Chen BoWen, Zhou Liping, Ke Xinjian, Yang Bingcheng, Yi Ailun, Wang Chengli, Zhang Jiaxiang, Dong Chun-Hua, Wan Shuai, Ou Xin
Opt Lett. 2024 Oct 15;49(20):5921-5924. doi: 10.1364/OL.532214.
Lithium tantalate on insulator (LTOI), taking advantage of high cost-effectiveness, ultra-low optical loss, and prominent electro-optic (EO) coefficient, shows great potential as an integrated waveguide-based optical platform for commercialization. Further research on monolithic nonlinear source generators with tunable features is crucial in its early stages. Here, we fabricate low-loss microring resonators (intrinsic Q value above 4 × 10) via universal subtractive manufacturing. Both Kerr and EO combs are realized based on X-cut LTOI high-Q resonators. Specifically, we elucidate the complicated synergy caused by a photorefractive (PR) effect and thermo-optic modulation, observing the soliton step using the facile laser scanning technique. Furthermore, the preliminary experimental result of the static EO comb is also exploited in a 20 GHz free spectral range (FSR) LTOI microring resonator, verifying the versatility of this unique photonic platform for on-chip microcomb generation.
绝缘体上钽酸锂（LTOI）凭借高性价比、超低光学损耗和显著的电光（EO）系数，作为一种基于集成波导的商业化光学平台展现出巨大潜力。在其早期阶段，对具有可调谐特性的单片非线性源发生器进行进一步研究至关重要。在此，我们通过通用减法制造工艺制造出低损耗微环谐振器（本征品质因数高于4×10）。基于X切LTOI高Q值谐振器实现了克尔梳和电光梳。具体而言，我们阐明了光折变（PR）效应和热光调制所引起的复杂协同作用，利用简便的激光扫描技术观察到了孤子阶跃。此外，静态电光梳的初步实验结果也在一个20吉赫兹自由光谱范围（FSR）的LTOI微环谐振器中得到应用，验证了这个独特光子平台用于片上微梳产生的通用性。
