Baylam, M. N.Cizmeciyan, S.Ozharar, S.Polat, E. O.Kocabas, C.Sennaroglu, A.2015-07-282015-07-2820140146-9592http://hdl.handle.net/11693/12638We report, for the first time to our knowledge, the demonstration of a graphene supercapacitor as a voltage-controlled saturable absorber for femtosecond pulse generation from a solid-state laser. By applying only a few volts of bias, the Fermi level of the device could be shifted to vary the insertion loss, while maintaining a sufficient level of saturable absorption to initiate mode-locked operation. The graphene supercapacitor was operated at bias voltages of 0.5-1V to generate sub-100 fs pulses at a pulse repetition rate of 4.51 MHz from a multipass-cavity Cr4+:forsterite laser operating at 1255 nm. The nonlinear optical response of the graphene supercapacitor was further investigated by using pump-probe spectroscopy. (C) 2014 Optical Society of AmericaEnglishLaserModulatorsArticle10.1364/OL.39.005180