Coherent beam combining based on adaptive polarization and active phase control technique
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摘要: 进行了非保偏放大器与保偏放大器的相干合成的实验研究。通过随机并行梯度下降（SPGD）算法对非保偏放大器进行偏振自适应控制，使非保偏放大器输出激光的消光比达到11.5 dB，与保偏放大器在同一偏振方向上的光功率占总功率的93.4%。利用单抖动法进行非保偏放大器与保偏放大器的主动相位控制，实现相干合成。实验结果表明：SPGD算法能够有效实现偏振自适应控制，偏振自适应控制前后相干合成远场的条纹对比度从80.1%提高到87.2%，相干合成的效果提升明显；通过增加参与合成的放大器路数，并在各路激光中引入多级功率放大器，能够得到更高的合成功率输出。
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关键词:
- 光纤放大器 /
- 相干合成 /
- 偏振自适应控制 /
- 随机并行梯度下降算法
Abstract: An experiment of coherent beam combination of a polarization maintaining(PM) ytterbium doped fiber amplifier (YDFA) and a non-PM YDFA is carried out. The adaptive polarization control based on the stochastic parallel gradient descent (SPGD) algorithm is obtained in the non-PM YDFA to make the output light polarization stable. The single frequency dithering algorithm is taken to compensate the phase errors in the system. The contrast of the far-field pattern increases remarkably from 80.1% to 87.2%. A scalable architecture for coherent beam combining of two styles of fiber amplifiers is also proposed. -
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