Generation and dynamics of stepped h-shaped noise-like pulses in a mode-locked thulium-doped fiber ring laser

被引：7
|
作者：
Huang, Jinjer [1 ]
Xie, Yanan [1 ]
Wu, Tong [1 ]
Zhang, Xinlu [1 ]
机构：
[1] Tiangong Univ, Sch Phys Sci & Technol, Tianjin 300387, Peoples R China
来源：
OPTICS AND LASER TECHNOLOGY | 2021年 / 141卷
基金：
中国国家自然科学基金;
关键词：
h-Shaped pulse; Thulium-doped fiber lasers; Mode-locking; Gain depletion; DISSIPATIVE SOLITON RESONANCE;
D O I：
10.1016/j.optlastec.2021.107151
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
New h-shaped pulses with stepped flattops are observed in a mode-locked thulium-doped fiber laser (251 m long cavity) by the nonlinear polarization rotation technique. The step at the end of an h-shaped pulse has a lower intensity and an almost fixed duration (similar to 5 ns) when it is tuned in the range of several tens of ns. By incorporating simple gain dynamics and a model of saturable absorption, the h-shaped pulses are simulated from a retrieval of noise-like pulse solutions. The change regularity of pulses in experiment is basically verified and explained by the numerical results. An analysis reveals that gain depletion and mode-locking threshold are key factors to form the 'h' shape. It is also proposed that the step tail is a kind of noise-like square wave pulse generated at the trailing edge.
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收藏
页数：6
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