衍射和干涉理论对Bessel光传输的描述

Description of diffraction-free Bessel beam propagation based on diffractive and interferential theory

采用衍射积分理论和干涉理论分别对轴棱锥产生的Bessel光的传输特性进行描述,并讨论了其适用条件和优缺点。数值模拟了光传输的3维强度分布,同时进行相关参数的实验测定。数值模拟和实验结果表明:在最大无衍射距离内,衍射理论能很好地描述Bessel光的轴上光强分布,当接近或超出最大无衍射距离时,干涉理论也能较好地描述Bessel光的强度分布,实验结果和理论分析基本吻合。

Based on the intcrferential theory and diffraction integral theory, the propagation characteristic of Bessel beam generated by an axicon was studied. The applicability and advantages of the theories were discussed as well. The 3-D beam intensity distribution was simulated numerically. The relative parameters were also measured experimentally. The numerical simulation and the experimental results show that, within the maximum diffraction-free distance, the on-axis intensity distribution of the Bessel beam can be described well by the diffractive theory, while the intensity distribution of the Bessel beam approach or beyond the maximum diffraction-free distance can be properly described by the interferential theory. The experimental results are consistent with the theoretical ones.