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Chin. Phys. B, 2020, Vol. 29(1): 014202    DOI: 10.1088/1674-1056/ab578a

Noise-like rectangular pulses in a mode-locked double-clad Er:Yb laser with a record pulse energy

Tianyi Wu(吴田宜)1, Zhiyuan Dou(窦志远)1, Bin Zhang(张斌)1,2,3, Jing Hou(侯静)1,2,3
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China;
2 State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China;
3 Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
Abstract  Generation of noise-like rectangular pulse was investigated systematically in an Er-Yb co-doped fiber laser based on an intra-cavity coupler with different coupling ratios. When the coupling ratio was 5/95, stable mode-locked pulses could be obtained with the pulse packet duration tunable from 4.86 ns to 80 ns. The repetition frequency was 1.186 MHz with the output spectrum centered at 1.6 μ. The average output power and single pulse energy reached a record 1.43 W and 1.21 μJ, respectively. Pulse characteristics under different coupling ratios (5/95, 10/90, 20/80, 30/70, 40/60) were also presented and discussed.
Keywords:  rectangular noise-like pulse      mode-locked laser      Er-Yb co-doped fiber laser  
Received:  24 August 2019      Revised:  15 September 2019      Accepted manuscript online: 
PACS:  42.55.Wd (Fiber lasers)  
  42.60.Da (Resonators, cavities, amplifiers, arrays, and rings)  
  42.60.Fc (Modulation, tuning, and mode locking)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61435009, 61235008, and 61405254).
Corresponding Authors:  Jing Hou     E-mail:

Cite this article: 

Tianyi Wu(吴田宜), Zhiyuan Dou(窦志远), Bin Zhang(张斌), Jing Hou(侯静) Noise-like rectangular pulses in a mode-locked double-clad Er:Yb laser with a record pulse energy 2020 Chin. Phys. B 29 014202

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