Abstract
Abstract Layered transition metal dichalcogenides with excellent nonlinear absorption properties have shown remarkable performance in acting as ultrafast photonics devices. In our work, palladium diselenide (PdSe2) nanosheets with competitive advantages of wide tunable bandgap, unique puckered pentagonal structure and excellent air stability are prepared by the liquid-phase exfoliation method. Its ultrafast absorption performance was verified by demonstrating conventional and dissipative soliton operations within Er-doped fiber lasers. The minimum pulse width of the conventional soliton was 1.19 ps. Meanwhile, dissipative soliton with a 46.67 mW output power, 35.37 nm spectrum width, 14.92 ps pulse width and 2.86 nJ pulse energy was also generated successfully. Our enhanced experiment results present the excellent absorption performance of PdSe2 and highlight the capacity of PdSe2 in acting as ultrafast photonics devices.
Highlights
Ultrafast mode-locked fiber lasers have been widely investigated owing to their extensive applications in communication, biophotonics, photochemistry and so on [1,2,3,4]
For testing the absorption characteristics of the PdSe2-polyvinyl alcohol (PVA) saturable absorbers (SAs), the output performance of the fiber laser was investigated without using the SA
Sidebands obtained in our work are not as obvious as previous results obtained in conventional soliton operations [28, 29]
Summary
Ultrafast mode-locked fiber lasers have been widely investigated owing to their extensive applications in communication, biophotonics, photochemistry and so on [1,2,3,4]. Active and passive mode-locked technologies have been widely employed to achieve ultrafast modelocked operations. A variety of saturable absorbers (SAs) such as single-walled carbon nanotubes [7,8,9], semiconductor saturable absorber mirrors [10, 11], graphene [12,13,14,15], graphene oxide [16] and quantum dots (QDs) [6, 7] have been extensively investigated for generating mode-locked fiber lasers. Graphene has enormously promoted the development of mode-locked lasers due to its properties of wide absorption range, low saturation intensity, ultrafast recovery time and high damage threshold [12,13,14,15]. TMDs exhibit significant essential applications in optoelectronic and biological
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