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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)

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Drop-port comb spectra at the different detuning stages marked in Figure 1c. (a) Spectra measured in a range of more than one octave (the increase on the low-frequency side is due to the optical spectrum analyzer background). (b) Zoomed-in IR spectra. (c) Zoomed-in second-harmonic spectra.