Photonic chip-based optical frequency comb using soliton Cherenkov radiation
Photonic chip-based optical frequency comb using soliton Cherenkov radiation
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DOI：
10.1126/science.aad4811
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发表时间：
2016-01-22
期刊：
影响因子：
56.9
通讯作者：
Kippenberg, T. J.
中科院分区：
文献类型：
--
作者：
Brasch, V.;Geiselmann, M.;Kippenberg, T. J.
光孤子是传播的光脉冲，由于非线性和色散相互平衡，因此保持其形状。在高阶色散存在的情况下，光孤子通过孤子切伦科夫辐射过程可以发射色散波。这个过程是超连续谱产生的基础，在频率计量中至关重要。利用连续波泵浦、色散工程、集成氮化硅微谐振器，我们产生了连续循环的时间耗散克尔孤子。高阶色散的存在导致了红移孤子切伦科夫辐射的发射。输出对应于一个完全相干的光学频率梳，它跨越三分之二的倍频程，其相位我们能够稳定到亚赫兹水平。通过在宽光谱带宽上保持相干性，我们的器件提供了开发用于频率计量或光谱学的紧凑型片上频率梳的机会。
Optical solitons are propagating pulses of light that retain their shape because nonlinearity and dispersion balance each other. In the presence of higher-order dispersion, optical solitons can emit dispersive waves via the process of soliton Cherenkov radiation. This process underlies supercontinuum generation and is of critical importance in frequency metrology. Using a continuous wave-pumped, dispersion-engineered, integrated silicon nitride microresonator, we generated continuously circulating temporal dissipative Kerr solitons. The presence of higher-order dispersion led to the emission of red-shifted soliton Cherenkov radiation. The output corresponds to a fully coherent optical frequency comb that spans two-thirds of an octave and whose phase we were able to stabilize to the sub-Hertz level. By preserving coherence over a broad spectral bandwidth, our device offers the opportunity to develop compact on-chip frequency combs for frequency metrology or spectroscopy.