Low-Threshold 4/5 Octave-Spanning Mid-Infrared Frequency Comb in a LiNbO<inline-formula><tex-math notation="LaTeX">$_3$</tex-math></inline-formula> Microresonator

Low-Threshold 4/5 Octave-Spanning Mid-Infrared Frequency Comb in a LiNbO<inline-formula><tex-math notation="LaTeX">$_3$</tex-math></inline-formula> Microresonator

Mid-infrared (MIR) optical frequency combs (OFCs) are ideal light sources for precision metrology and can find extensive applications, especially in molecular spectroscopy and gas detection. Here the generation of mode-locked MIR frequency comb in a LiNbO<inline-formula><tex-math notation=&...

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Bibliographic Details
Main Authors: Weichen Fan, Zhizhou Lu, Wei Li, Xinyu Wang, Mengyao Zhou, Weiqiang Wang, Qibing Sun, Guoxi Wang, Dong Cheng, Leiran Wang, Wenfu Zhang, Wei Zhao
Format: Article
Language:English
Published: IEEE 2019-01-01
Series:IEEE Photonics Journal
Subjects:
Lithium niobate
nonlinear optics
mid-infrared
high-order dispersion
self-steepening.
Online Access:https://ieeexplore.ieee.org/document/8882290/
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Summary:Mid-infrared (MIR) optical frequency combs (OFCs) are ideal light sources for precision metrology and can find extensive applications, especially in molecular spectroscopy and gas detection. Here the generation of mode-locked MIR frequency comb in a LiNbO<inline-formula><tex-math notation="LaTeX">$_3$</tex-math></inline-formula> microring through optimized slot-waveguide design is proposed. Such microcomb can span over four-fifths of an octave (ranging from <inline-formula><tex-math notation="LaTeX">$\sim$</tex-math></inline-formula>2810&#x00A0;nm to <inline-formula><tex-math notation="LaTeX">$\sim$</tex-math></inline-formula>4630&#x00A0;nm) with pump power as low as 50&#x00A0;mW, which can be applied to the 2<italic>f</italic>-3<italic>f</italic> self-referencing for fully stabilization and helpful to monolithic integration of the whole system. Further investigations on complex dynamical processes for the microcomb generation suggest that the intracavity soliton drifting caused by the third-order dispersion could be compensated by the self-steepening effect as introducing an additional drift through proper dispersion tailoring. This work could facilitate the low-threshold broadband MIR frequency comb generation technique, as well as provide a way to realize more delicate control of soliton microcombs in both temporal and spectral domain.
ISSN:1943-0655

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