Simultaneous adaptive control of dual deformable mirrors for full-field beam shaping with the improved stochastic parallel gradient descent algorithm.
Simultaneous adaptive control of dual deformable mirrors for full-field beam shaping with the improved stochastic parallel gradient descent algorithm.
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DOI：
10.1364/ol.38.000326
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发表时间：
2013-02
期刊：
影响因子：
3.6
通讯作者：
Haotong Ma;Zejin Liu;Xiaojun Xu;Jin-bao Chen
中科院分区：
文献类型：
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作者：
Haotong Ma;Zejin Liu;Xiaojun Xu;Jin-bao Chen
我们提出并证明了同时自适应控制的双变形镜系统的全场光束整形的基础上，改进的随机并行梯度下降（SPGD）算法和双相位液晶空间光调制器（LC-SLM）。一个LC-SLM自适应地重新分配输入光束的强度，另一个自适应地补偿输出光束的波前。然而，强度重新分布和波前补偿闭环同时运行。另外，光强重分布和波前补偿闭环独立地采用各自的度量函数。实验结果表明，改进的SPGD算法不仅可以控制双变形镜结构自适应地产生具有理想光强分布的近衍射极限平顶光束，而且可以大大提高控制带宽。
We propose and demonstrate the simultaneous adaptive control of a dual deformable mirror system for full-field beam shaping based on an improved stochastic parallel gradient descent (SPGD) algorithm and dual-phase-only liquid crystal spatial light modulators (LC-SLMs). One LC-SLM adaptively redistributes the intensity of the input beam and the other adaptively compensates the wavefront of the output beam. However, the intensity redistribution and wavefront compensation closed loops run simultaneously. In addition, the intensity redistribution and wavefront compensation closed loops adopt their respective metric functions independently. Experimental results show that the improved SPGD algorithm can not only be used for controlling dual deformable mirror configuration to adaptively generate near diffraction-limited flattop beams with desired intensity distributions, but also can greatly improve the control bandwidth.