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(a) Optical spectrum. The FWHM spectral width Δλ is approximately 5.7 nm. (b) Autocorrelation traces of the experimental data (circles) and fit curve. (c) Oscilloscope trace with a separation of ~622 ns, corresponding to the cavity length of ~128 m. (d) Fundamental RF spectrum with a resolution of 1 kHz and a span of 1 MHz.
