强激光与粒子束, 2013, 25 (1): 5, 网络出版: 2013-01-07
基于偏振自适应和主动相位控制的相干合成的实验研究
Coherent beam combining based on adaptive polarization and active phase control technique
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 fiber amplifier coherent beam combination adaptive polarization control stochastic parallel gradient descent algorithm
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。
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.
熊玉朋, 粟荣涛, 李霄, 马阎星, 许晓军. 基于偏振自适应和主动相位控制的相干合成的实验研究[J]. 强激光与粒子束, 2013, 25(1): 5. Xiong Yupeng, Su Rongtao, Li Xiao, Ma Yanxing, Xu Xiaojun. Coherent beam combining based on adaptive polarization and active phase control technique[J]. High Power Laser and Particle Beams, 2013, 25(1): 5.