期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.203902
关键词
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资金
- Fraunhofer and Max Planck Cooperation Programme
- Horizon 2020 Framework Programme [812818]
- Gisela and Erwin Sick Fellowship
- Leverhulme Trust [RPG-2015-456]
- EPSRC [2119373] Funding Source: UKRI
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.
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