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      Femtosecond pulse generation with voltage-controlled graphene saturable absorber

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      Author(s)
      Baylam, M. N.
      Cizmeciyan, S.
      Ozharar, S.
      Polat, E. O.
      Kocabas, C.
      Sennaroglu, A.
      Date
      2014
      Source Title
      Optics Letters
      Print ISSN
      0146-9592
      Publisher
      Optical Society of America
      Volume
      39
      Issue
      17
      Pages
      5180 - 5183
      Language
      English
      Type
      Article
      Item Usage Stats
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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
      Keywords
      Laser
      Modulators
      Permalink
      http://hdl.handle.net/11693/12638
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/OL.39.005180
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      • Department of Physics 2397
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