Frequency Comb Generation via Cascaded Second-Order Nonlinearities in Microresonators

Szabados, Jan, Puzyrev, Danila N., Minet, Yannick, Reis, Luis, Buse, Karsten, Villois, Alberto, Skryabin, Dmitry V. and Breunig, Ingo (2020) Frequency Comb Generation via Cascaded Second-Order Nonlinearities in Microresonators. Physical Review Letters, 124 (20). ISSN 0031-9007

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Abstract

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.

Item Type:	Article
Additional Information:	Publisher Copyright: © 2020 American Physical Society.
Uncontrolled Keywords:	physics and astronomy(all) ,/dk/atira/pure/subjectarea/asjc/3100
Faculty \ School:	Faculty of Science > School of Engineering, Mathematics and Physics
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	11 Feb 2026 09:30
Last Modified:	22 Feb 2026 00:54
URI:	https://ueaeprints.uea.ac.uk/id/eprint/101905
DOI:	10.1103/PhysRevLett.124.203902

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