title: Femtosecond pulse generation with voltage-controlled graphene saturable absorber.
abstract: We 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 Cr(4+):forsterite laser operating at 1255 nm. The nonlinear optical response of the graphene supercapacitor was further investigated by using pump-probe spectroscopy.
authors.forename: I
authors.initials: I
authors.lastname: Baylam
authors.forename: M N
authors.initials: MN
authors.lastname: Cizmeciyan
authors.forename: S
authors.initials: S
authors.lastname: Ozharar
authors.forename: E O
authors.initials: EO
authors.lastname: Polat
authors.forename: C
authors.initials: C
authors.lastname: Kocabas
authors.forename: A
authors.initials: A
authors.lastname: Sennaroglu