模拟退火算法光纤放大器相干合成
Coherent beam combining of fiber amplifiers based on stimulated annealing algorithm
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摘要: 提出了利用模拟退火算法实现相干合成的思路。对利用模拟退火算法实现多路光纤放大器相干合成进行了数值模拟，验证了方法的有效性，并分析了算法收敛速度与合成光束数目的关系。进行了两路W量级光纤放大器相干合成的实验，结果表明，模拟退火算法能够有效控制各路光纤激光的相位，系统闭环将目标圆孔内的能量提高了1.8倍，并使得目标圆孔内能量大于理想值80 %的概率从19.4 %提升到了51.3 %，取得了较为明显的相干合成效果。
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关键词:
- 光纤放大器 /
- 相干合成 /
- 模拟退火算法 /
- 主动相位控制 /
- 随机并行梯度下降算法
Abstract: This paper proposes the novel concept of coherent beam combining using stimulated annealing algorithm. Numerical simulation on coherent beam combining of multiple fiber amplifiers is carried out; the dependence of convergence rate on laser numbers is analyzed. Coherent beam combining of two watt-level fiber amplifiers is experimentally achieved. Experimental result shows that the whole system in close-loop performs well for long-time observation. The average energy encircled in the target pinhole is 1.8 times higher than that in the case of open-loop. The probability of energy encircled in the main-lobe to be more than 80% of its ideal value is increased from 19.4% to 51.3% when the system evolves from open-loop to close-loop. -
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