轴棱锥产生无衍射光束自再现特性的几何光学分析

由几何光学方法分析轴棱锥产生无衍射光束自再现特性，很好地解释了无衍射光束自再现的形成原理.在菲涅耳近似条件下，利用菲涅耳衍射理论可以对光传输进行很好地描述；而光束经过障碍物后的很小距离内，菲涅耳衍射近似条件已不满足，衍射理论不再适合描述光束的传输特性，这时可以利用几何光学分析光束传输特性.首先从几何光学角度对轴棱锥产生无衍射光束的自再现特性进行了详细的描述，并对光束传输进行仿真，最后通过实验验证轴棱锥产生无衍射光束的自再现特性，实验结果与理论分析相符合.关键词：无衍射光束几何光学轴棱锥自再现

Geometric optics analysis on self-reconstruction of the nondiffracting beam generated from an axicon

Self-reconstruction of the nondiffracting beam generated from an axicon was analyzed for the first time based on the geometrical optics and the formation principle of self-reconstruction was well explained. In the Fresnel approximation, beam transmission characteristics were described well using the theory of Fresnel diffraction. But the approximation condition will not satisfy in the quite little distance after beam passing through the obstacle and the diffraction theory is no longer suitable. In such case, geometrical optics can be used to describe the beam transmission characteristics. In this paper, self-reconstruction of the nondiffracting beam generated from an axicon was analyzed in detail based on the geometrical optics. Simulation and experimental observation of the self-reconstruction characteristic are presented. The experimental results agree with the theoretical analysis.