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. 2017 Apr 21;6(4):e16253. doi: 10.1038/lsa.2016.253

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Copyright © 2017 The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/

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Hot-cavity detuning measurement. (a) Experimental setup. The frequency of the reference laser is ~10 GHz lower than the microcomb line to be measured. (b) Representative beat notes observed on the electrical spectrum analyzer. (c) Hot-cavity detuning, defined as the resonance frequency minus the microcomb frequency. A change in the linear slope can be observed when the comb transitions from stage II to stage III, indicating a jump in the comb line spacing. (d) Measured microcomb beat note with electro-optic down-mixing, showing the comb line spacing jump.