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. 2016 May 16;6:26024. doi: 10.1038/srep26024

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(a) Optical spectrum with a spectral resolution of 0.02 nm at pump power P = 27 mW. The FWHM spectral width Δλ is approximately 2.08 nm. (b) Autocorrelation traces of the experimental data (circles) and sech²-shaped fit (solid curve). (c) Fundamental RF spectrum with a resolution of 1 Hz and a span of 100 Hz. Inset: oscilloscope trace with a separation of 529.4 ns, corresponding to 1.888847 MHz of the fundamental cavity frequency, which is independent of the pump power. (d) Wideband RF spectrum up to 500 MHz.