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Preparation steps of graphene oxide (GO) solution: (a) GO slices, ultrasonicated (b) and centrifuged (c) GO solution, (d) GO dispersion of Langmuir-Blodgett (LB) in methanol, and (e) the GO saturable absorber (SA) films coated on the quartz plate. The following surface pressures were selected: 22 mN/m (corresponds to the sample marked as GO-22) and 38 mN/m (corresponds to the sample marked as GO-38), these two pressures correspond to regions II and III, respectively.
