Experimental study on mode instability in high power all-fiber master oscillator power amplifer fiber lasers

被引：7
|
作者：
Tao Ru-Mao [1 ]
Zhou Pu [1 ]
Wang Xiao-Lin [1 ]
Si Lei [1 ]
Liu Ze-Jin [1 ]
机构：
[1] Natl Univ Def Technol, Coll Optoelect Sci & Engn, Changsha 410073, Hunan, Peoples R China
来源：
ACTA PHYSICA SINICA | 2014年 / 63卷 / 08期
基金：
中国国家自然科学基金;
关键词：
mode instability; fiber amplifier; quantum defect; thermal effect; PHOTONIC-CRYSTAL FIBER; BEAM QUALITY; SYSTEMS; ORIGIN;
D O I：
10.7498/aps.63.085202
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Mode instability (MI) is an abrupt mode change when the average output power increases above a certain threshold power, which results in degrading beam quality and restricting the enhancement of power output for diffraction-limited high power fiber laser. The experimental study on MI in all-fiberized master oscillator power amplifer (MOPA) is presented in detail for the first time. It is revealed that MI in all-fiberized MOPA results in reducing the slope efficiency. The theoretical threshold power of MI for 20/400 step-index large-mode-area double-cladding Yb-doped fiber is about 1 kW and MI is rooted mainly from the thermal effect.
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页数：6
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