Pulse type switchable, spectral bandwidth dynamically adjustable all-fiber laser mode-locked by NALM. (January 2023)

• Record Type: Journal Article
• Authors: Tao, Jianing; Song, Yuanqi; Li, Yangyang; Jia, Xuzhuo; Hou, Lei; Lu, Baole; Bai, Jintao
• Is Part Of: Optics & laser technology. Volume 157(2023)
• Publication Date: 2023-01
• Subjects: Pulse type switchable -- Spectral bandwidth adjustable -- Mode-locked fiber laser; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2022.108682
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: Dynamically adjustable spectral width is achieved in a fiber laser mode-locked by NALM. Switching of dissipative soliton, bound state soliton and noise-like pulse are generated. The switching process of dissipative soliton and noise-like pulse is illustrated. Abstract: We report a mode-locked fiber laser based on the nonlinear amplifying loop mirror (NALM), which allows the output of three different types of pulses: dissipative soliton (DS), bound-state soliton (BSS), and noise-like pulse (NLP). Among them, the spectral widths of the DS and BSS can be adjusted over a wide range, and their pulse widths vary correspondingly. The gain inside the NALM is provided by the polarization-maintaining Er-doped fiber (PM-EDF), which introduces both linear and nonlinear phase shifts so that the laser has a low mode-locking threshold. The gradual change from DS to NLP can be achieved by polarization state adjustment without changing the pump power. Our results provide a fiber laser with tunable spectral bandwidth and switchable pulse type, which offers the possibility of different kinds of application requirements.