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Frequency Comb Generation via Cascaded Second-Order Nonlinearities in Microresonators
Physical Review Letters ( IF 9.227 ) Pub Date : 2020-05-22 , DOI: 10.1103/physrevlett.124.203902
Jan Szabados; Danila N. Puzyrev; Yannick Minet; Luis Reis; Karsten Buse; Alberto Villois; Dmitry V. Skryabin; Ingo Breunig

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 χ(3) nonlinearity of the resonator material. An alternative approach is making use of second-order χ(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.
更新日期:2020-05-22

 

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