Phase-coherent microwave-to-optical link with a self-referenced microcomb
Phase-coherent microwave-to-optical link with a self-referenced microcomb
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DOI：
10.1038/nphoton.2016.105
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发表时间：
2016-08-01
期刊：
影响因子：
35
通讯作者：
Diddams, Scott A.
中科院分区：
文献类型：
--
作者：
Del'Haye, Pascal;Coillet, Aurelien;Diddams, Scott A.
精确测量光波的频率已经成为常见的锁模激光频率梳(1)。尽管取得了巨大的成功，光学频率梳目前仍然是笨重和昂贵的实验室设备。集成光子微谐振器是梳状发生器在实验室外应用的有前途的候选者，具有降低成本、功耗和尺寸的潜力(2)。这些进步将对光谱学和微量气体传感(3)、天文学(4)、通信(5)和原子计时（6,7）等领域产生重大影响。然而，尽管近年来取得了显著的进展（8-10），但微谐振器频率梳（“微梳”）一直没有直接f-2f自参考的关键功能(1)，这可以精确确定每个梳线的绝对频率。在这里，我们使用16.4 GHz微梳实现了这个缺失的元素，该微梳相干扩展到八度跨度频谱，随后完全相位稳定到原子钟。我们展示了梳的相参控制，并演示了其低噪声工作。
Precise measurements of the frequencies of light waves have become common with mode-locked laser frequency combs(1). Despite their huge success, optical frequency combs currently remain bulky and expensive laboratory devices. Integrated photonic microresonators are promising candidates for comb generators in out-of-the-lab applications, with the potential for reductions in cost, power consumption and size(2). Such advances will significantly impact fields ranging from spectroscopy and trace gas sensing(3) to astronomy(4), communications(5) and atomic time-keeping(6,7). Yet, in spite of the remarkable progress shown over recent years(8-10), microresonator frequency combs ('microcombs') have been without the key function of direct f-2f self-referencing(1), which enables precise determination of the absolute frequency of each comb line. Here, we realize this missing element using a 16.4 GHz microcomb that is coherently broadened to an octave-spanning spectrum and subsequently fully phase-stabilized to an atomic clock. We show phase-coherent control of the comb and demonstrate its low-noise operation.