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. 2018 May 14;9:1869. doi: 10.1038/s41467-018-04350-1

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© The Author(s) 2018

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Fig. 4 — Repetition rate tuning of the dual-comb source. The frequency spacing of the dual-comb source is dictated by the spacing of each of the modelocked combs. The plot shows 14 MHz spacing (a) and a 26 MHz spacing (b). The spacing is tuned by adjusting the thermoelectric coolers to change the resonance position of the microresonators