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. 2020 Nov 9;9:185. doi: 10.1038/s41377-020-00419-z

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© The Author(s) 2020

Open Access 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/.

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Fig. 3 — a Spectra of the fundamental mode-locked states (measured with a pump power of 520 mW). Increasing the V_SD enables the central wavelength of the laser envelope to redshift from 1562 to 1594 nm. b Examples of high-order harmonic-mode locking with repetition rates of 50 and 80 GHz. Panels from left to right: the optical spectra, the laser beat notes, and the frequency-resolved second-harmonic autocorrelation maps