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(a) Schematic of the 480 kHz triple-buffered FDML laser. (b) Optical spectrum of the laser. (c) Interferometric trace of the 480 kHz laser from the Mach-Zehnder interferometer. The sweeps indicated by “seed” were generated from the laser cavity. ISO, optical isolator; FFP‑TF, fiber-optic Fabry-Perot tunable filter; SOA, semiconductor optical amplifier
