AI 中文总结
研究探索基于五氧化二钽的光子晶体微谐振器在O波段产生频率梳，通过特定设计实现200GHz模式间距的高效孤子梳形成，能在单一器件内从窄带调至宽带梳状状态，输出低噪声，为相关应用提供了波长灵活、低噪声的微梳生成方法。
AI 中文摘要
光子晶体微谐振器（PhCRs）是产生克尔频率梳的强大平台。由于PhCRs中的克尔孤子动力学在很大程度上与工作波长解耦，梳状输出可通过器件层定制来设计。本文展示了支持1310nm和1550nm波段运行的五氧化二钽（钽酸）PhCR平台，并探索了用全半导体激光泵浦的高效O波段孤子微梳。通过二氧化硅包层和本征品质因数超过\(7\times10^{6}\)的正常色散来设计PhCRs。通过泵浦带隙模式，在200GHz模式间距下获得了稳健且高效的孤子梳形成。梳状信号表现出接近散粒噪声极限的低相对强度噪声。利用第二个谐振器耦合器在片外放大梳状输出。这些结果确立了钽酸平台中的PhCR工程作为一种可扩展方法，用于通信、传感和信号处理中波长灵活、低噪声的微梳。
英文摘要
Photonic-crystal microresonators (PhCRs) are a powerful platform for generating Kerr frequency combs. Because Kerr-soliton dynamics in PhCRs are largely decoupled from the operating wavelength, the comb output can be engineered through customization of the device layer. Here, we demonstrate a tantalum pentoxide (tantala) PhCR platform that supports 1310 nm and 1550 nm band operation, and we explore high-efficiency O-band soliton microcombs with all-semiconductor laser pumps. We engineer the PhCRs with silicon dioxide cladding and normal dispersion with intrinsic quality factors exceeding $7\times10^{6}$. By pumping bandgap modes, we obtain robust and efficient soliton comb formation at a 200 GHz mode spacing. Our PhCRs enable systematic tuning from narrowband to broadband comb states within a single device geometry. The combs exhibit low relative intensity noise approaching the shot-noise limit, indicating stable phase-matching in the PhCR. Using a second resonator coupler, we amplify the comb output off-chip, demonstrating a pathway to high-power O-band sources. These results establish PhCR engineering in the tantala platform as a scalable approach to wavelength-agile, low-noise microcombs for applications in communications, sensing, and signaling.
