采用湿化学法，以石墨粉为原料，脱氧胆酸钠为表面活性剂，水为溶剂，利用超声波分散技术制备石墨烯水溶液；利用台式匀胶机制得石墨烯薄膜，并通过紫外吸收光谱对石墨烯溶液和薄膜进行了表征。采用锁模光纤激光器对石墨烯的可饱和吸收特性进行了研究。结果表明，石墨烯溶液和薄膜均具有非线性可饱和吸收特性，且其可饱和吸收特性无波长选择特性。石墨烯成本远远低于作为锁模器件的半导体可饱和吸收镜(SESAM)，具有类可饱和吸收体无法比拟的优势。

A graphene-water solution and graphene-polyvinyl alcohol composite are fabricated from graphite by wet-chemistry techniques. The research shows that both of graphene solutions and the composite have saturable absorption ability. The atomic layer grapheme possesses wavelength-independent ultrafast saturable absorption, which can be realized mode-locking in a large-wide-range wavelength. The cost of the atomic layer graphene is far lower than that of semiconductor saturable absorber mirror (SESAM) as a mode-locker.