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. 2018 Feb 23;7:17180. doi: 10.1038/lsa.2017.180

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Copyright © 2018 The Author(s)

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Pulse characterization. (a) Mode-locked spectrum measured with a Fourier transform infrared (FTIR) spectrometer (Bristol 721), showing a full-width at half-maximum (FWHM) spectrum bandwidth of 19.5 nm. The bandwidth slightly exceeds the fluorescence spectrum of the Ho:YAG crystal at FWHM. (b) Intensity autocorrelation trace. The pulse duration is 260 fs assuming a sech² shape autocorrelation fit, indicating nearly Fourier transform-limited pulses (time-bandwidth product: 0.34). (c) Radio frequency spectrum measured using a radio frequency analyzer with a resolution bandwidth of 100 Hz. It shows a high extinction of ~78 dB, implying stable mode-locked operation.