一种集成超低噪声螺旋干涉激光
An Integrated Ultralow Noise Spiral Interferometric Laser
AI总结：
本文提出了一种基于干涉仪的超低噪声芯片集成激光，实现了超窄线宽和低频率噪声，展示了在微波频率转换中的高性能表现。
摘要：
光子集成有潜力将复杂的高性能光学系统以紧凑的半导体芯片形式实现。然而，系统功能的范围严重依赖于自由空间和光纤组件的可集成程度。超低膨胀腔稳定激光——常用于精密计量、高分辨率传感器和原子物理先进系统——是目前没有直接在芯片上实现的组件。已存在稳定到光子集成谐振腔的激光器，但其频率噪声明显更高，并伴有较大的频率漂移。本文演示了一种新的架构，基于稳定到具有长25米不平衡延迟线的干涉仪的正弦光 fringe 的超窄线宽集成激光。这种干涉激光不仅推动了芯片激光的最先进水平，我们还引入了一种幅度锁定方案，大大抑制了激光的长期频率漂移。我们实现了记录的芯片上分数频率噪声为5.6×10^-14，对应于12 Hz线宽，中心频率为1348 nm。为了展示该激光的实用性，我们将光载波分割到微波频率，证明了其能够比最先进的石英晶体振荡器高出15 dB或更多。
英文摘要：
Photonic integration offers the potential to bring complex high-performance optical systems to the form factor of a compact semiconductor chip. However, the range of system functions accessible critically depends on the extent to which free-space and fiber components can be made integrable. The ultralow-expansion cavity-stabilized laser$-$often used in precision metrology, high-resolution sensors, and advanced systems in atomic physics$-$is one component that currently has no direct parallel on chip. Lasers stabilized to photonically-integrated resonators exist, but exhibit considerably higher frequency noise and are accompanied by large levels of frequency drift. We demonstrate here a new architecture for an ultranarrow linewidth integrated laser based on stabilization to a sinusoidal fringe of an interferometer having a long 25-m unbalanced delay line. Our interferometric laser not only advances the state-of-the-art for on-chip lasers, but we in addition introduce an amplitude locking scheme that greatly suppresses the laser's long-term frequency wander. We achieve a record on-chip fractional frequency noise of $5.6 \times 10^{-14}$, corresponding to a linewidth of 12 Hz centered at 1348 nm. To showcase the utility of this laser, we divide the optical carrier to microwave frequencies, demonstrating the ability to outperform state-of-the-art quartz crystal oscillators by 15 dB or more.
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