Generation of different mode-locked states in a Yb-doped fiber laser based on nonlinear multimode interference

被引:18
作者
Cheng, Peiyun [1 ,2 ]
Han, Mengmeng [1 ,2 ]
Lan, Qianying [1 ,2 ]
Shu, Xuewen [1 ,2 ]
机构
[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China
[2] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
rotation; nonlinear polarization evolution; nonlinear optical loop mirror; semiconductor saturable; (NLMMI) technique based on single mode fiber-multimode fiber -single mode fiber (SMF-MMF; GRADED-INDEX FIBER; NOISE-LIKE PULSES; SATURABLE ABSORBER; DISSIPATIVE SOLITONS; TOPOLOGICAL INSULATOR; BOUND SOLITONS; LOCKING;
D O I
10.1364/OE.468615
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We demonstrated an ultrafast Yb-doped fiber laser with a single mode fiber-graded index multimode fiber-single mode fiber (SMF-GIMF-SMF) structure based saturable absorber. The GIMF was placed in the groove of an in-line fiber polarization controller to adjust its birefringence, enabling the SMF-GIMF-SMF structure to realize efficient saturable absorption based on nonlinear multimode interference without strict length restriction. By adjusting two intra-cavity polarization controllers, stable dissipation solitons and noise-like pulses were achieved in the 1030 nm waveband with pulse durations of 10.67 ps and 276 fs, respectively. We also realized Q-switched mode-locked pulses in the same fiber laser cavity. By the dispersive Fourier transform method, the real-time spectral evolution in the buildup process of the Q-switched mode-locked state was captured, which showed that the continuous-wave in this laser could gradually evolved into the stable Q-switched mode-locked pulses through unstable self-pulsation, relaxation oscillation and rogue Q-switching stage. To the best of our knowledge, our work reveals the buildup dynamics of the Q-switched mode-locked operation in a fiber laser for the first time. And we also studied the real-time spectral evolution of the stable Q-switched mode-locked pulses, which exhibited periodic breathing property.
引用
收藏
页码:35911 / 35922
页数:12
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