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Graphene mode-locked fiber laser. EDF—erbium doped fiber, PC—polarization controller, OC—output coupler, GSA—Graphene saturable absorber.
(a) Power dependent absorption of the graphene SA with calculated SA parameters; (b) AFM scan image with height profiles of the 10 × 10 µm area.
Fundamental mode-locked laser performance: (a) optical spectrum measured with 0.02 nm resolution, (b) RF spectrum measured at 910 kHz RBW, (c) full RF spectrum with 7 GHz span, and (d) oscilloscope trace.
Optical spectrum at 21st harmonic (2.22 GHz).
RF spectrum of the mode-locked laser output measured with 2.7 MHz resolution bandwidth (RBW) and 7 GHz span. Inset: spectrum centered at 2.22 GHz.
Recorded temporal laser pulse train. Inset: pulse train with 200 ns span.
Autocorrelation trace of the 900 fs pulse.
Videos presenting the repetition frequency change while changing of the pumping power. (a) The oscilloscope screen while increasing the pump power, (b) RF spectrum while increasing, and (c) decreasing the pump power (enhanced online). [URL: http://dx.doi.org/10.1063/1.4704913.1] [URL: http://dx.doi.org/10.1063/1.4704913.2] [URL: http://dx.doi.org/10.1063/1.4704913.3]10.1063/1.4704913.110.1063/1.4704913.210.1063/1.4704913.3
Relation between the harmonic of the fundamental repetition rate and the launched pump power (square dots). Solid line—linear fit.
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