Titanium Disulfide Based Saturable Absorber for Generating Passively Mode-Locked and Q-Switched Ultra-Fast Fiber Lasers

• Published in: Nanomaterials (Basel, Switzerland) Vol. 10; no. 10; p. 1922
• Main Authors: Shang, Xinxin, Guo, Linguang, Zhang, Huanian, Li, Dengwang, Yue, Qingyang
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 26.09.2020; MDPI
• Subjects: Absorbers; Chemical vapor deposition; Doped fibers; Energy; Fiber lasers; Graphene; High-damage 2D Titanium disulfide materials; Lasers; mode-locked and Q-switched; Photonics; Polyvinyl alcohol; Pulse duration; Q switched lasers; saturable absorber; Spectrum allocation; Spectrum analysis; Titanium; ultra-fast optical modulation
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano10101922

In our work, passively mode-locked and Q-switched Er-doped fiber lasers (EDFLs) based on titanium disulfide (TiS2) as a saturable absorber (SA) were generated successfully. Stable mode-locked pulses centred at 1531.69 nm with the minimum pulse width of 2.36 ps were obtained. By reducing the length of the laser cavity and optimizing the cavity loss, Q-switched operation with a maximum pulse energy of 67.2 nJ and a minimum pulse duration of 2.34 µs was also obtained. Its repetition rate monotonically increased from 13.17 kHz to 48.45 kHz with about a 35 kHz tuning range. Our experiment results fully indicate that TiS2 exhibits excellent nonlinear absorption performance and significant potential in acting as ultra-fast photonics devices.