Production of Pseudo-Bessel Beam with Uniform Axial Intensity

Yanzhong Yu, W. Dou
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Abstract

The uniformity of the axial intensity distribution of an axicon is very important in practical applications. However, its axial intensity distribution usually exhibits oscillations when an axicon is illuminated by a cohere wave. To uniform the axial intensity distribution within a desired range, an anamorphic binary axicon is proposed in our paper and obtained from an original binary axicon by optimization design. And the optimization tool is to combine a genetic algorithm (GA) with a rigorous electromagnetic computation method, which is a twodimensional finite-difference time-domain (2-D FDTD) method in connection with Stratton-Chu formula (SCF). Numerical simulation result demonstrates that, compared with the original binary axicon, the anamorphic one can greatly improve the uniformity of the axial intensity distribution, when both are illuminated by a plane wave. Keywords-anamorphic binary axicon; pseudo-Bessel Beam; GA; 2-D FDTD; SCF
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轴向强度均匀的拟贝塞尔梁的制备
轴突轴向强度分布的均匀性在实际应用中是非常重要的。然而,当轴子被相干波照射时,其轴向强度分布通常表现为振荡。为了使轴向强度分布在期望的范围内均匀,本文提出了一种变形的二元轴,并通过优化设计在原二元轴的基础上得到。优化工具是将遗传算法(GA)与严格的电磁计算方法相结合,即结合Stratton-Chu公式的二维时域有限差分(2d FDTD)方法。数值模拟结果表明,在平面波照射下,与原二元轴形相比,变形轴形能大大改善轴形强度分布的均匀性。关键词:变形二元轴;pseudo-Bessel梁;遗传算法;二维有限差分;自洽场
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