High uniformity flattop beam shape correction with complex amplitude aberration of the incidence

IF 3.7 2区工程技术 Q2 OPTICS

Optics and Lasers in Engineering Pub Date : 2025-08-22 DOI:10.1016/j.optlaseng.2025.109275

Churan Han , Liangcai Cao , Dun Liu , Hao Tu , Qiaofeng Tan

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引用次数: 0

Abstract

A high uniformity flattop beam is essential in various scientific and industrial applications. However, commercial lasers often suffer from beam quality degradation, leading to a distorted beam shape. In this paper, we propose a staged Adam-stochastic parallel gradient descent (ASPGD) algorithm and a modulated performance metric for flattop beam correction. The staged optimization process contains a pre-optimization of the focus point to generate a proper initial phase mask for accelerating the flattop beam correction. The developed comprehensive performance metric is compared with the conventional mean square error and proven to be more effective. The proposed beam shaping strategy can achieve a high-uniformity flattop beam without measuring the complex amplitude aberration of the incidence. Numerical simulations validate the feasibility of the proposed method under different distorted incidences. In the experiment, we corrected the uniformity of several flattop beams under an elliptically Gaussian distributed incidence, and all beams achieved uniformity better than 0.12, as evaluated according to the ISO 13694 standard

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高均匀度平顶光束形状校正与复振幅像差的入射

在各种科学和工业应用中，高均匀性的平顶光束是必不可少的。然而，商用激光器经常遭受光束质量下降，导致扭曲的光束形状。在本文中，我们提出了一种分段adam -随机平行梯度下降（ASPGD）算法和一种用于平顶光束校正的调制性能度量。阶段优化过程包括焦点的预优化，以产生适当的初始相位掩模，以加速平顶光束校正。将所建立的综合性能指标与传统的均方误差进行了比较，证明了其有效性。所提出的光束整形策略可以在不测量入射光束复幅差的情况下获得高均匀性的平顶光束。数值仿真验证了该方法在不同畸变发生率下的可行性。在实验中，我们校正了几个平顶光束在椭圆高斯分布入射下的均匀性，所有光束的均匀性都优于0.12，根据ISO 13694标准评估

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics and Lasers in Engineering 工程技术-光学

CiteScore

8.90

自引率

8.70%

发文量

384

审稿时长

42 days

期刊介绍： Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods. Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following: -Optical Metrology- Optical Methods for 3D visualization and virtual engineering- Optical Techniques for Microsystems- Imaging, Microscopy and Adaptive Optics- Computational Imaging- Laser methods in manufacturing- Integrated optical and photonic sensors- Optics and Photonics in Life Science- Hyperspectral and spectroscopic methods- Infrared and Terahertz techniques