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由汉克尔波理论分析了贝塞尔(Bessel)光束的形成原理,很好地解释了零阶和高阶Bessel光束的自重建特性.利用衍射积分理论和柯林斯公式条件下的传输模型数值模拟了一阶贝塞尔-高斯(Bessel-Gauss)光束经过轴上圆形障碍物后的光强分布特性.结果表明,高阶Bessel-Gauss光束也具有零阶Bessel光束类似的自重建特性.实验上采用轴棱锥聚焦涡旋光束获得一阶Bessel-Gauss光束,然后通过轴上圆形障碍物、轴上和离轴正方形障碍物,验证了高阶Bessel-Gauss光束的自重建特性.理论模拟和实验结果相吻合.
According to Hankel theory, the formation principle of Bessel beam is analyzed, and the self-reconstruction properties of zero-order and high-order Bessel beams are well explained. Using the numerical simulation of transmission model under the condition of diffraction integral theory and Collins formula The light intensity distribution of a Bessel-Gauss beam passing through a circular obstacle on the axis shows that the higher-order Bessel-Gauss beam also has the similar self-reconstruction properties of the Bessel-like zero-order beam. The first-order Bessel-Gauss beams are obtained by focusing the eddy beams with axicon and then the self-reconstruction properties of the higher-order Bessel-Gauss beams are verified by the circular obstacles on the axis, the on-axis and off-axis square obstacles. The theoretical simulation and The experimental results are consistent.