Limitations of graphene nanocoated optical tapers for high-power nonlinear applications

In this letter, we investigate the limitations of graphene as a saturable absorber for high-power nonlinear optical applications. The response of graphene nanocoated optical tapers against the average optical power injected is tested. We point out that the power handled by such components is limited and their nonlinear properties are strongly and permanently modified when exposed to high optical power. The origin of the degradation of the components is discussed. [Display omitted] •Graphene nanoflakes exposed to high optical power lose their nonlinear properties.•Graphene nanocoated tapers are limited to optical power of hundreds of milliwatts.•Badly cooled graphene-based devices are subject to irreversible deterioration.