▎ 摘　　要

The aim of this work was to compare the difference in nonlinear optical properties between graphene dispersions and thin films. We experimentally demonstrate that Graphene-N-Methyl-2-pyrrolidone dispersions were shown to exhibit nonlinear scattering at the 1.2 mu m wavelength, femtosecond laser regime. This has potential uses for optical limiting and general laser safety. Whereas both graphene and graphene-Poly(nnethyl methacrylate) composite films (fabricated via wet chemistry techniques) display strong saturable absorption, and look to be viable as a mode-locking material. Graphene looks promising for the planned next step of 2 mu m mode-locking.