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Raman signature of graphene obtained from reducing graphene oxide. Inset: Linear absorption of graphene coated onto a piece of quartz substrate.
cw mode locked pulse train.
(a) Autocorrelation trace of the cw mode locked pulses. Closed circles are data points and the solid line is a Gaussian fit. (b) The corresponding optical spectrum.
Transmission of graphene with increasing pump intensity. Closed circles are data points while the solid line is the fitting obtained from Eq. (1).
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