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. 2017 Oct 13;8:906. doi: 10.1038/s41467-017-00897-7

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© The Author(s) 2017

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. 7 — A sample trace of an atomic frequency comb. This comb has N = 9 teeth and and a bandwidth B = 6 GHz. The sample is derived from an average over traces of 50 experimental runs; d ₁ indicates the peak-to-peak optical depth that constitutes the AFC while d ₀ is the background optical depth. The finesse F of the AFC is given by the ratio Δ/γ, where Δ is the separation between the teeth and γ is the linewidth of the teeth