发表机构
University of California, Santa Barbara; Massachusetts Institute of Technology（加州大学圣塔芭芭拉分校; 麻省理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出单谐振InGaP微谐振器，结合大χ(2)非线性与高Q值，实现高效可调二次谐波、宽带量子频率梳及低阈值参量振荡，性能媲美双谐振系统。
AI 中文摘要
在低光功率下实现强χ(2)相互作用是可扩展非线性光学和量子光子学的关键。尽管双谐振微谐振器表现出卓越的效率，但它们要求相距甚远的光学频率同时满足谐振和相位匹配条件，这使其对制造和工作条件固有地敏感。单谐振腔通过在基频处仅谐振而让二次谐波场单次通过传播来消除这一约束，但传统上牺牲了非线性效率。在此，我们展示了一种绝缘体上InGaP单谐振微谐振器，克服了这一权衡。通过将InGaP的大χ(2)非线性与高品质因子谐振器相结合，我们实现了高效且广泛可调的二次谐波产生、宽带量子频率梳产生以及低阈值光学参量振荡。与传统的厘米级单谐振器件不同，我们的毫米级InGaP器件提供了与双谐振系统相当甚至超越的非线性性能。通过克服单谐振器件传统的效率-鲁棒性权衡，这项工作为低功率、宽带和广泛可调的χ(2)非线性及量子光子学开辟了新途径。
英文摘要
Strong $χ^{(2)}$ interactions at low optical powers are key to scalable nonlinear and quantum photonics. Although doubly resonant microresonators exhibit exceptional efficiencies, they require simultaneous resonance and phase matching of widely separated optical frequencies, making them inherently sensitive to fabrication and operating conditions. Singly resonant cavities eliminate this constraint by resonating at only the fundamental frequency while the second-harmonic field propagates in a single pass, but they have traditionally sacrificed nonlinear efficiency. Here, we demonstrate a singly resonant InGaP-on-insulator microresonator that overcomes this tradeoff. Combining the large $χ^{(2)}$ nonlinearity of InGaP with high-quality-factor resonators, we achieve efficient and widely tunable second-harmonic generation, broadband quantum-frequency-comb generation, and low-threshold optical parametric oscillation. Unlike conventional centimeter-long singly resonant devices, our millimeter-scale InGaP devices deliver nonlinear performance comparable to, and even exceeding, doubly resonant systems. By overcoming the conventional efficiency-robustness tradeoff of singly resonant devices, this work opens a new route to low-power, broadband, and widely tunable $χ^{(2)}$ nonlinear and quantum photonics.
