Frequency Comb Generation via Cascaded Second-Order Nonlinearities in Microresonators
Frequency Comb Generation via Cascaded Second-Order Nonlinearities in Microresonators
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DOI：
10.1103/physrevlett.124.203902
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发表时间：
2020-05-22
影响因子：
8.6
通讯作者：
Breunig, Ingo
中科院分区：
文献类型：
--
作者：
Szabados, Jan;Puzyrev, Danila N.;Breunig, Ingo
光频梳是现代时间和频率计量学的革命。在过去的几年里，它们的应用范围大幅增加，这是由于它们通过基于微谐振器的解决方案实现了小型化。这种器件中的梳通常使用谐振器材料的三阶χ（3）非线性来产生。另一种方法是利用二阶chi（（2））非线性。虽然以这种方式产生梳的想法已经存在了近二十年，但到目前为止，只有少数演示是已知的，无论是基于庞大的蝴蝶结腔还是相对低Q的波导谐振器。在这里，我们提出了第一个这样的梳是基于毫米大小的微谐振器由锂碳酸盐，允许级联的二阶非线性。这款概念验证器件的泵浦功率低至2 mW，可在1064和532 nm附近产生重复频率锁定梳。从非线性动力学的角度来看，所观察到的梳对应于图灵辊图案。
Optical frequency combs are revolutionizing modern time and frequency metrology. In the past years, their range of applications has increased substantially, driven by their miniaturization through microresonator-based solutions. The combs in such devices are typically generated using the third-order chi((3)) nonlinearity of the resonator material. An alternative approach is making use of second-order chi((2)) nonlinearities. While the idea of generating combs this way has been around for almost two decades, so far only few demonstrations are known, based either on bulky bow-tie cavities or on relatively low-Q waveguide resonators. Here, we present the first such comb that is based on a millimeter-sized microresonator made of lithium niobate, that allows for cascaded second-order nonlinearities. This proof-of-concept device comes already with pump powers as low as 2 mW, generating repetition-rate-locked combs around 1064 and 532 nm. From the nonlinear dynamics point of view, the observed combs correspond to Turing roll patterns.