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CoBi4Se7-based mode-locked fiber laser generating dark pulses and its soliton dynamics analysis

Author

Listed:
  • Ge, Chengda
  • Yao, Yong
  • Guo, Bo
  • Guo, Linguang
  • Yang, Yu
  • Qiu, Haoxue
  • Li, Songting
  • Zhang, Jinwei
  • Zhang, Zheng
  • Duan, Jianan
  • Xu, Xiaochuan
  • Tian, Jiajun
  • Yang, Yanfu

Abstract

In recent years, two-dimensional (2D) materials have been widely applied in the optoelectronic field, especially as saturable absorbers (SAs) in fiber lasers. CoBi4Se7, as a ferromagnetic topological insulator, possesses unique ferromagnetism and a relatively high bandgap, making it a promising candidate for use as an SA. This paper investigates the saturable absorption characteristics of CoBi4Se7 and develops a CoBi4Se7-D-type fiber SA for use in doped fiber lasers. Traditional bright pulses, dark pulses, bright-dark (BD) pulses, and dark-bright (DB) pulses are obtained, and the soliton dynamics of BD pulses are analyzed. To the best of our knowledge, this is the first time that a CoBi4Se7-based SA has been used to realize a mode-locked fiber laser. It is observed and confirmed that in the process of generating BD pulses, dark pulses are formed prior to bright pulses.

Suggested Citation

  • Ge, Chengda & Yao, Yong & Guo, Bo & Guo, Linguang & Yang, Yu & Qiu, Haoxue & Li, Songting & Zhang, Jinwei & Zhang, Zheng & Duan, Jianan & Xu, Xiaochuan & Tian, Jiajun & Yang, Yanfu, 2026. "CoBi4Se7-based mode-locked fiber laser generating dark pulses and its soliton dynamics analysis," Chaos, Solitons & Fractals, Elsevier, vol. 208(P4).
    • Handle: RePEc:eee:chsofr:v:208:y:2026:i:p4:s0960077926004674
    DOI: 10.1016/j.chaos.2026.118326
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