Publication: Femtosecond pulse generation with voltage-controlled graphene saturable absorber
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KU Authors
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Ćzharar, Sarper
Polat, Emre Ozan
Kocabas, CoÅkun
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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 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 America
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Publisher
Optical Soc Amer
Subject
Optics
Citation
Has Part
Source
Optics Letters
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DOI
10.1364/OL.39.005180