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Frequency comb generation in non-centrosymmetric optical microresonators

: Szabados, Jan; Breunig, Ingo; Buse, Karsten

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Created on: 10.3.2020

Kudryashov, A.V. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Laser Resonators, Microresonators, and Beam Control XXII : 1-6 February 2020, San Francisco, California
Bellingham, WA: SPIE, 2020 (Proceedings of SPIE 11266)
Paper 112660G, 6 pp.
Conference "Laser Resonators, Microresonators, and Beam Control" <22, 2020, San Francisco/Calif.>
Conference Paper, Electronic Publication
Fraunhofer IPM ()
Frequency Combs; Microresonator; nonlinear optics; whispering gallery resonators

Optical frequency combs are a key technology for precision measurements. In the past years, microresonatorbased frequency combs based on third-order χ (3) (Kerr) nonlinearities have attracted significant attention thanks to their small footprint and their wide-ranging applications in fields such as telecommunications, molecular spectroscopy or ultrafast distance measurements. In this contribution, we present a frequency comb generated in a microresonator made of 5% MgO-doped congruent lithium niobate, a non-centrosymmetric crystalline material, employing the generally much stronger second-order χ (2)-nonlinearities of such a material via a scheme of cascaded nonlinear processes. This approach paves the way towards reduced pump thresholds for comb generation and comes with intrinsic suitability for self-referencing.