Near-diffraction-limited flattop laser beam adaptively generated by stochastic parallel gradient descent algorithm.
Near-diffraction-limited flattop laser beam adaptively generated by stochastic parallel gradient descent algorithm.
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DOI：
10.1364/ol.35.002973
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发表时间：
2010-09
期刊：
影响因子：
3.6
通讯作者：
Haotong Ma;Zejin Liu;Xiaojun Xu;Sanhong Wang;Changhai Liu
中科院分区：
文献类型：
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作者：
Haotong Ma;Zejin Liu;Xiaojun Xu;Sanhong Wang;Changhai Liu
基于随机并行梯度下降算法和双相位液晶空间光调制器（LC-SLM），实现了近场近衍射极限平顶激光的自适应产生.一个LC-SLM重新分配强度，另一个补偿输出光束的波前。实验结果表明，约69%的功率被封闭在小于6%的均方根强度变化的区域。直径为5 mm的近衍射极限输出光束在超过30 cm的工作距离内保持平顶强度分布而没有显著的衍射峰。
We demonstrate the adaptive generation of a near-diffraction-limited flattop laser beam in the near field based on the stochastic parallel gradient descent algorithm and dual-phase-only liquid crystal spatial light modulators (LC-SLMs). One LC-SLM redistributes the intensity, and the other compensates the wavefront of the output beam. The experimental results show that approximately 69% of the power is enclosed in a region with less than 6% rms intensity variation. The 5mm diameter near-diffraction-limited output beam retains a flattop intensity distribution without significant diffraction peaks for a working distance of more than 30 cm.