Chaos-assisted two-octave-spanning microcombs

Creators: Chen, Hao-Jing; Ji, Qing-Xin; Wang, Heming; Yang, Qi-Fan; Cao, Qi-Tao; Gong, Qihuang; Yi, Xu; Xiao, Yun-Feng

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Abstract

Since its invention, optical frequency comb has revolutionized a broad range of subjects from metrology to spectroscopy. The recent development of microresonator-based frequency combs (microcombs) provides a unique pathway to create frequency comb systems on a chip. Indeed, microcomb-based spectroscopy, ranging, optical synthesizer, telecommunications and astronomical calibrations have been reported recently. Critical to many of the integrated comb systems is the broad coverage of comb spectra. Here, microcombs of more than two-octave span (450 nm to 2,008 nm) is demonstrated through χ^((2)) and χ^((3)) nonlinearities in a deformed silica microcavity. The deformation lifts the circular symmetry and creates chaotic tunneling channels that enable broadband collection of intracavity emission with a single waveguide. Our demonstration introduces a new degree of freedom, cavity deformation, to the microcomb studies, and our microcomb spectral range is useful for applications in optical clock, astronomical calibration and biological imaging.

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© The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Received 05 March 2019; Accepted 03 April 2020; Published 11 May 2020. The authors thank K. Vahala, B. Shen, L. Wu, Y. Zhi, P. Del'Haye, X.-C. Yu, L. Wang, Y.-J. Qian, L. Shao, C.-H. Dong, J.-h. Chen, X.-F. Jiang, S.-X. Zhang, S.-J. Tang, L. Yao and L.-K. Chen for helpful discussions. This project is supported by the National Key R&D Program of China (Grant No. 2016YFA0301302 and No. 2018YFB2200401), the National Natural Science Foundation of China (Grant Nos. 11825402, 11654003, 61435001, and 12041602), Beijing Academy of Quantum Information Sciences (Y18G20), Key R&D Program of Guangdong Province (2018B030329001) and the High-performance Computing Platform of Peking University. X.Y. is supported by U.S. National Science Fundation (award no. 1842641). Data availability: Source data for Fig. 2 to Fig. 5 can be accessed at https://doi.org/10.6084/m9.figshare.12030408. Additional information is available from the corresponding authors upon reasonable request. Code availability: The codes that support the findings of this study are available from the corresponding authors upon reasonable request. Author Contributions: Y.-F.X. and X.Y. conceived the idea and designed the experiments. H.-J.C. fabricated the devices and built the experimental setup. H.-J.C., Q.-X.J., H.W., and Q.-F.Y. performed the measurements. Q.-X.J. and Q.-T.C. built the theoretical model and performed the simulations. All authors analyzed the data, participated in preparing the manuscript, and contributed to the discussions. Y.-F.X., X.Y., and Q.G. supervised the project. The authors declare no competing interests.

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