We already know that laser can be used to produce graphene (see here and here), and in 2010 researchers developed an ultra-fast mode-locked laser using Graphene. A recent research improved their graphene-based laser device to produce a broad spectrum of infrared wavelengths. This may be useful for applications such as fiber optic communications.

The researchers say that their results suggest it will be possible to create graphene-base lasers that emit light over the entire spectrum of visible light.