Palladium diselenide as a direct absorption saturable absorber for ultrafast mode-locked operations: from all anomalous dispersion to all normal dispersion

• Published in: Nanophotonics (Berlin, Germany) Vol. 9; no. 14; pp. 4295 - 4306
• Main Authors: Xu, Nannan, Wang, Haifeng, Zhang, Huanian, Guo, Linguang, Shang, Xinxin, Jiang, Shouzhen, Li, Dengwang
• Format: Journal Article
• Language: English
• Published: Berlin De Gruyter 01.10.2020; Walter de Gruyter GmbH
• Subjects: Absorption; Dispersion; dissipative soliton; Doped fibers; Energy dissipation; Fiber lasers; large-energy mode-locked lasers; Liquid phases; Palladium; palladium diselenide; Photonics; Pulse duration; Solitary waves; Transition metal compounds; ultrafast modulation application
• ISSN: 2192-8606; 2192-8614
• DOI: 10.1515/nanoph-2020-0267

Layered transition metal dichalcogenides with excellent nonlinear absorption properties have shown remarkable performance in acting as ultrafast photonics devices. In our work, palladium diselenide (PdSe ) 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 PdSe and highlight the capacity of PdSe in acting as ultrafast photonics devices.