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. 2022 Jun 20;11:187. doi: 10.1038/s41377-022-00890-w

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© The Author(s) 2022

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. 5 — a Lasing spectra at 20, 24, and 26 mA to show the spectral broadening and mode hopping from a group H_A to H_B; inset: the microscopic image of a CSHM laser. b Lasing spectra with main lasing modes in H_B. Period-one and Period-two states can be observed clearly at 38 and 44 mA, respectively; inset: lasing spectra versus current, including two groups of modes H_A and H_B in the whole scale