Fundamental optical linewidth of soliton microcombs

F. Lei, Z. Ye, A. Fülöp, V. Torres‐Company
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引用次数: 3

Abstract

Soliton microcombs provide a versatile platform for realizing fundamental studies and technological applications. To be utilized as frequency rulers for precision metrology, soliton microcombs must display broadband phase coherence, a parameter characterized by the optical phase or frequency noise of the comb lines and their corresponding optical linewidths. Here, we analyze the optical phase-noise dynamics in soliton microcombs and show that, because of the Raman self-frequency shift, the fundamental linewidth of some of the comb lines can, surprisingly, be narrower than the linewidth of the pump laser. This work elucidates information about the ultimate limits in phase coherence of soliton microcombs and illustrates a new strategy for the generation of spectrally coherent light on chip.
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孤子微梳的基本光学线宽
孤子微梳为实现基础研究和技术应用提供了一个通用的平台。要用作精密测量的频率标尺,孤子微梳必须显示宽带相位相干性,这是一个以梳线的光相位或频率噪声及其相应的光线宽为特征的参数。在这里,我们分析了孤子微梳中的光学相位噪声动力学,并表明,由于拉曼自频移,一些梳线的基本线宽可以令人惊讶地比泵浦光的线宽窄。这项工作阐明了孤子微梳相相干性的极限信息,并阐明了在芯片上产生光谱相干光的新策略。
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