The influence of relative parameters,such as the focal length of the convergence lens and the distance between the convergence lens and the axicon, on the propagation distance of long distance diffraction-free beam generated by two axicons is analyzed using ray-tracing method. Numerical simulation is carried out with Mathcad. The results show that, while other conditions are invariable, the propagation distance of long distance diffraction-free beam decreases as the focal length of the convergence lens increases, and rises with the increasing of the distance between the convergence lens and the axicon. The theory is verified by experiment, and the experimental results are consistent with theoretical analysis.%利用光线追迹法分析了会聚透镜焦距及会聚透镜与轴棱锥的距离等相关参数对双轴棱锥产生的长距离近似无衍射光束传播距离的影响,运用Mathcad对其进行了数值模拟.结果显示:在其他条件不变的情况下,近似无衍射光束的传播距离随会聚透镜焦距的增大而减小,随会聚透镜与轴棱锥之间距离的增大而增大.通过实验对理论进行了验证,所得结果与理论分析相吻合.
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