22 GHz窄线宽全光纤激光器实现2.62 kW近衍射极限输出

基金项目: 国家重点研发计划项目（2017YFB1104401）

22 GHz linewidth all-fiber laser achieved 2.62 kW near diffraction-limited output

摘要:
基于大模场面积掺镱光纤搭建了全光纤1064 nm高功率窄线宽光纤激光主振荡功率放大系统，实现了2625 W的最高功率输出，斜率效率76%。最高输出功率时，光束质量为M_x²＝1.273，M_y²＝1.255，3 dB光谱宽度为21.7 GHz，这是目前全光纤激光器在该光谱线宽下实现的最高输出功率。
- 窄线宽激光器 /
- 掺镱激光器 /
- 单模激光器
Abstract:
This paper demonstrates an all-fiber high-power Yb-doped 1064 nm fiber laser based on master oscillator power amplifier structure. The record output power up to 2625 W was achieved, along with a slope efficiency of 76%. The beam quality factor is M_x²＝1.273, M_y²＝1.255, and full width at half maximum is 21.7 GHz at maximum power level. The fiber laser has the highest output power of all-fiber lasers with 22 GHz linewidth.
- narrow linewidth fiber laser /
- ytterbium doped fiber laser /
- single mode fiber laser

图 1 激光输出功率与返回功率随泵浦功率的变化

Figure 1. Output power and backward power vs pump power of fiber laser

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图 2 窄线宽光纤激光器不同输出功率下的光束质量

Figure 2. Beam quality factors at different output powers of narrow linewidth fiber laser

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图 3 光纤激光器在不同输出功率下的输出光谱和返回光光谱

Figure 3. Output spectrum and backward spectrum of fiber laser at different output power

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