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(Color online) Raman spectra showing the D, G, and 2D modes of the graphene film on the gold mirror (upper trace) and the graphite flake starting material (lower trace). The laser excitation wavelength was 514 nm.
(Color online) Schematic of the FG-SAM mode-locked fiber laser. EDF = erbium-doped fiber and WDM = wavelength-division multiplexer.
(Color online) Optical spectrum of the laser, showing typical soliton behavior. The optical bandwidth is 12.5 nm FWHM.
(Color online) Second-order autocorrelation of the compensated output pulses. Blue dots: Data. Red line: Sech2 fit. The autocorrelation duration is 290 fs FWHM, corresponding to a pulse duration of 190 fs FWHM.
(Color online) Left: RF spectrum of laser photocurrent. Right: High-resolution RF spectrum of the fundamental repetition rate beatnote near 42.8 MHz.
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