Abstract
Carbon-based nanomaterials, and specifically carbon nanotube and graphene, have been widely used as saturable absorber (SA) in ultrafast fiber laser. However, the performance of these SAs is limited due to the low damage threshold or self-starting capability. In our work, we have proposed a novel and straightforward method for enhancing the optical performance of polyvinyl alcohol-based carbon nanotube and graphene composite film. By mechanical stretching the composite films, the damage threshold of carbon nanotube-based SA and the self-starting capability of graphene-based SA can be obviously improved. The distinct nonlinear optical properties of carbon nanotube and graphene are analyzed, and the mode-locking performance is compared. Our finding provides a new insight and experimental basis for the development of high-performance carbon-based nanomaterial mode locker for ultrafast fiber lasers.
Published Version
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