Theoretical and experimental study on kW all fiber laser
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摘要: 基于主振荡功率放大结构设计了kW级全光纤激光器，对激光器的功率分布及输出、弯曲选模以及冷却条件下增益光纤的热分布进行了数值模拟分析。搭建了所设计的全光纤激光器，在注入总泵浦功率1436 W时，实验获得了1060 W高功率连续激光输出，光光转换效率73.8%，光束质量因子小于1.6。初步分析了导致激光器实验输出与理论设计二者偏差的原因。Abstract: kW-class all-fiber laser was designed by employing master oscillator power amplifier (MOPA) configuration. Power output and distribution, mode controlling by bending, thermal distribution of active fiber in cooling condition were numerically analyzed. The fiber laser based on our design was built up. In the experiment, 1060 W continuous laser was obtained with a total pumped power of 1436 W. The optical-optical conversion efficiency was 73.8% and the beam quality M2 was less than 1.6. We preliminarily discussed the difference between the experimental results and theoretical design.
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Key words:
- all-fiber lasers /
- MOPA configuration /
- power distribution /
- mode control by bending /
- active cooling
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