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(a) Optical spectrum. The spectral width Δλ is ~2.4 nm. (b) Autocorrelation traces of the experimental data (circles) and sech2-shaped fit (solid curve). (c) Oscilloscope trace with a separation of 760 ns, corresponding to the cavity length of 156 m. (d) Fundamental RF spectrum with a resolution of 1 kHz and a span of 1 MHz.
