发表机构
National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, College of Engineering and Applied Sciences, School of Physics, Research Institute of Superconductor Electronics (RISE) & Key Laboratory of Optoelectronic Devices and Systems with Extreme Performances of MOE, Key Laboratory of Intelligent Optical Sensing and Manipulation, Ministry of Education, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University; Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences; Nanzhi Institute of Advanced Optoelectronic Integration; Purple Mountain Laboratories（南京大学固体微结构物理国家重点实验室、电子科学与工程学院、工程与应用科学学院、物理学院、超导电子研究所（RISE）、教育部极端性能光电器件与系统重点实验室、智能光探测与操纵教育部重点实验室、先进微结构协同创新中心; 中国科学院苏州纳米技术与纳米仿生研究所; 南智先进光电集成研究院; 紫金山实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过腔相位匹配在约800 nm波段实现低噪声克尔梳，并直接参考铷原子跃迁，为任意波长梳产生和非线性频率转换开辟新途径。
AI 中文摘要
相位匹配是非线性光学中的一个基本问题，通常受材料色散的限制。相位匹配窗口内的有限工作波长限制了应用，包括使用克尔梳进行精密计量。紧凑型光钟和天文光谱学等要求苛刻的应用需要约800 nm的原子参考，而该波段的自然相位匹配具有挑战性。在此，我们重新审视腔相位匹配（CPM）的概念，并充分揭示其在超越材料色散方面工程化人工相位匹配的优势。通过在一个具有宏观腔长的单片高Q值光纤法布里-珀罗谐振器中实现CPM条件，我们在单模激光二极管的功率预算内，实现了约800 nm的低噪声克尔梳产生。在一个体积为19 cm³的泵浦集成封装内，对于10.1 GHz的重复频率，在100 kHz偏移频率处实现了-125 dBc/Hz的低相位噪声。最重要的是，所生成的克尔梳已直接参考铷原子跃迁，以实现长期稳定运行。这一结果不仅为在任意波长产生克尔梳开辟了新途径，而且可推广到任何其他非线性光学频率转换应用。
英文摘要
Phase matching is a fundamental problem in nonlinear optics that is normally constrained by material dispersion. The limited operation wavelengths within phase matching window limits the application, including the precise metrology using Kerr combs. Demanding applications like compact optical clock and astronomical spectroscopy requires atomic reference around 800 nm, where the natural phase matching is challenging. Here we revisit the concept of cavity phase matching (CPM), and fully reveal its advantage to engineer artificial phase matching beyond material dispersion. With the access of CPM condition in a monolithic high-Q fiber Fabry-Pérot resonator featuring a macroscopic cavity length, we achieve low noise Kerr comb generation around 800 nm, within the power budget of a single-mode laser diode. Inside a pump-integrated package of 19 cm3, low phase noise of -125 dBc/Hz at 100 kHz offset frequency is achieved for a 10.1 GHz repetition rate. Most importantly, the generated Kerr comb has been directly referenced to rubidium atomic transition for long-term stable operation. This result not only opens a new way for Kerr comb generation at arbitrary wavelengths, but also can be generalized to any other nonlinear optical frequency conversion application.
