中国激光, 2011, 38 (12): 1202008, 网络出版: 2011-11-28   

基于并行梯度下降算法的自适应任意口径光束整形

Shaped Beam of Arbitrary Size with Adaptive Optics Based on Stochastic Parallel Gradient Descent Algorithm
作者单位
1 国防科学技术大学光电科学与工程学院, 湖南 长沙 410073
2 中国人民解放军73903部队, 福建 厦门 361100
摘要
为了提高激光系统的整体效率,需要输出激光具有特定的光强分布。基于并行梯度下降(SPGD)算法的自适应光束整形方法凭借其良好的适用性得到了迅速发展,然而其整形效果较大程度地受到目标光束尺寸的影响。提出一种新的光束整形方法:采用SPGD算法对入射光束进行近场整形后通过控制4f系统得到需要口径的光强分布。研究了理想高斯光束和含静态像差高斯光束的光束整形效果,同时对其光束口径的可控性进行了模拟分析。研究结果表明,设计的整形系统可以有效地实现有无波前畸变的入射光束的任意口径光束整形,具有更好的适应性和实用性。
Abstract
Certain irradiance profile of laser output is needed to increase the entire efficiency of laser system. Beam shaping with adaptive optics based on stochastic parallel gradient descent (SPGD) algorithm is developing rapidly because of its outstanding applicability, however, shaping effect of this method largely depends on the target beam size. A new method of far field irradiance profile control is presented. The input beam is shaped in the near field with SPGD algorithm, and then imaged by a 4f system. The effect of far field irradiance profile control is studied for the input beams with and without wavefront aberration. Size control of the far field irradiance profile is analyzed. The result reveals that the new system could realize beam shaping whether the input beam has wavefront aberration or not. And it could realize size control of the far field irradiance profile. The new system has better applicability and utility than traditional ones.

蒋鹏志, 马浩统, 袁凌峰, 邹永超, 杜少军. 基于并行梯度下降算法的自适应任意口径光束整形[J]. 中国激光, 2011, 38(12): 1202008. Jiang Pengzhi, Ma Haotong, Yuan Lingfeng, Zou Yongchao, Du Shaojun. Shaped Beam of Arbitrary Size with Adaptive Optics Based on Stochastic Parallel Gradient Descent Algorithm[J]. Chinese Journal of Lasers, 2011, 38(12): 1202008.

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