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(Color online) (a) Illustration of the two-component ultrafast dynamics after photon-excitation in graphene. (b) UV-Vis-NIR absorption spectrum for stable graphene dispersion. Inset: photograph of the measured graphene dispersion. (c) Raman spectra at room temperature taken by focusing the 532 nm laser on the graphene films of the SAM.
(Color online) Configuration of the graphene mode-locked laser. M1: dichroic mirror coated for high transmission (HT) at the pump wavelength and high reflection (HR) in 1010–1070 nm region. M2, M3: HR concave mirrors. GTI1, GTI2: HR Gires-Tournois interferometer mirrors with dispersion of −1300 and −600 fs2 per reflection, respectively.
(Color online) (a) Average output power as a function of absorbed pump power. Three different operation regimes, i.e., QML under low pump power, CWML, and QML under high pump power, are indicated with dashed lines, respectively. Insert (b), (c), and (d) are the transverse beam profiles recorded in the three distinctive regimes.
(Color online) (a) Pulse trains in 20 ns and 50 μs per division (div) time scales. (b) Normalized autocorrelation trace for 428 fs duration. Inset: the corresponding spectrum centered at 1031.1 nm.
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