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(a) Optical spectrum with a spectral resolution of 0.02 nm. The spectral width Δλ is approximately 9.4 nm. (b) Autocorrelation trace of the experimental data (circles) and Gaussian-shaped fit (solid curve). (c) Oscilloscope trace with a pulse separation of ~275 ns, corresponding to the cavity length of ~56 m. (d) Fundamental RF spectrum with a resolution of 1 kHz and a span of 1 MHz.
