Transition-metal dichalcogenides heterostructure saturable absorbers for ultrafast photonics

Abstract

In this Letter, high-quality ${\mathrm{WS}}_2$ film and ${\mathrm{MoS}}_2$ film were vertically stacked on the tip of a single-mode fiber in turns to form heterostructure (${\mathrm{WS}}_2\text{-}{\mathrm{MoS}}_2\text{-}{\mathrm{WS}}_2$)-based saturable absorbers with all-fiber integrated features. Their nonlinear saturable absorption properties were remarkable, such as a large modulation depth ($\sim 16.99\%$) and a small saturable intensity ($6.23\mathrm{MW}·{\mathrm{cm}}^{-2}$). Stable pulses at 1.55 μm with duration as short as 296 fs and average power as high as 25 mW were obtained in an erbium-doped fiber laser system. The results demonstrate that the proposed heterostructures own remarkable nonlinear optical properties and offer a platform for adjusting nonlinear optical properties by stacking different transition-metal dichalcogenides or modifying the thickness of each layer, paving the way for engineering functional ultrafast photonics devices with desirable properties.

© 2017 Optical Society of America

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