Abstract
This Letter compared the absorption characteristics of a homemade graphene- (G-B) van der Waals heterostructure to a topological insulator (TI) with a similar preparation method and number of layers. The results indicate that the G-B heterostructure can tremendously enhance the modulation depth and saturable intensity. In addition, a passively -switched laser at 1.06 μm with a G-B heterostructure as a saturable absorber (SA) was demonstrated for the first time, to the best of our knowledge. Compared to TI, the G-B heterostructure -switched laser had better laser performance, indicating that a G-B heterostructure is a promising SA candidate for a 1 μm laser.
© 2019 Optical Society of America
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