Effects of flake size on mode-locking behavior for flake-graphene   saturable absorber mirrors
  After advent of graphene as a saturable absorber many experiments have been conducted to produce short pulse duration pulses. Here, we have measured the properties of flake-graphene saturable absorber mirrors of various flake sizes dependent on fabrication technique. These mirrors enabled us to obtain a large mode-locking bandwidth of 16nm in an erbium-doped fiber laser. Mirrors with large flake size and multi-layered thickness induce strong pulse shaping and reflect mode-locked train of pulses with very large bandwidths. 
M.I. Hussain, B.V. Cunning, L.S. Booth, M.J. Petrasiunas, C.L. Brown   and D. Kielpinski
physics.optics