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Graphene preparation on a fiber ferrule. (a) Initial scotch tape exfoliation of the highly ordered pyrolytic graphite to adjust the thickness. (b) Contact of a surface-cleaned fiber ferrule with the graphite. (c) Careful separation of the ferrule from the graphite. (d) Conceptual explanation of the resultant “graphene-deposited fiber ferrule.”
AFM analysis on the few-layered graphene. Its 3D image (left) and height analysis on the selected parts (right) are presented.
(a) Raman characterization of the mechanically exfoliated graphene layer in a log scale. Inset shows a TEM image of the terrace-structured graphene. (b) Comparison of the Raman peaks in a linear scale between the mechanically exfoliated graphene and the chemically synthesized one.
Chromatic dispersion characteristics of the three graphene samples, which reveal that the dispersion values were negligible. The inset presents the dispersion measurement setup based on the phase shift method.
(a) Experimental setup for a passively pulsed fiber ring laser. (b) Measured oscilloscope waveform traces, (c) optical spectra, and (d) rf spectra of the output pulse trains of samples 1, 2, and 3, which verify the case-insensitive operation of the graphene saturable absorbers that were prepared via mechanical exfoliation.
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