Laser cavity-soliton microcombs
Laser cavity-soliton microcombs
复制标题
DOI：
10.1038/s41566-019-0379-5
复制
发表时间：
2019-06-01
期刊：
影响因子：
35
通讯作者：
Pasquazi, Alessia
中科院分区：
文献类型：
--
作者：
Bao, Hualong;Cooper, Andrew;Pasquazi, Alessia
基于微腔的频率梳或“微梳”（1，2）通过发现时间腔孤子实现了许多基本突破（3-21）。由Lugiato-Lefever方程（22）描述的这些自定域波由通常包含总功率（23）的95%的辐射背景维持。目前正在研究有效产生和控制它们的简单方法，以最终将微梳作为实验室外的工具（24）。在这里，我们演示了微梳激光腔孤子。激光腔孤子本质上是无背景的，并且支撑了半导体激光器的关键突破（22，25 -28）。通过将它们的性质与多模系统的物理学相结合，我们为微腔中孤子的产生和控制提供了一个新的范例。我们证明了在平均功率比Lugiato-Lefever孤子功率阈值低一个数量级以上时诱导的50 nm宽的亮孤子梳（22），测量到75%的模式效率，而亮Lugiato-Lefever孤子的理论极限为5%（23）。最后，我们可以在没有任何主动反馈的情况下，将重复频率调整到1兆赫以上。
Microcavity-based frequency combs, or 'microcombs'(1,2), have enabled many fundamental breakthroughs(3-21) through the discovery of temporal cavity-solitons. These self-localized waves, described by the Lugiato-Lefever equation(22), are sustained by a background of radiation usually containing 95% of the total power(23). Simple methods for their efficient generation and control are currently being investigated to finally establish microcombs as out-of-the-lab tools(24). Here, we demonstrate microcomb laser cavity-solitons. Laser cavity-solitons are intrinsically background-free and have underpinned key breakthroughs in semiconductor lasers(22,25-28). By merging their properties with the physics of multimode systems(29), we provide a new paradigm for soliton generation and control in microcavities. We demonstrate 50-nm-wide bright soliton combs induced at average powers more than one order of magnitude lower than the Lugiato-Lefever soliton power threshold(22), measuring a mode efficiency of 75% versus the theoretical limit of 5% for bright Lugiato-Lefever solitons(23). Finally, we can tune the repetition rate by well over a megahertz without any active feedback.