摘要
本文主要从惠更斯-菲涅尔衍射积分出发推导了无衍射光束的轴上光强和最大准直距离的计算公式,测量了平行光通过轴棱锥后产生的不同传输距离的无衍射光束的光强情况,讨论了不同的棱角的轴棱锥、不同的光阑半径对最大准直距离的影响情况。实验结果显示,当激光光束经过轴棱锥转换后在最大准直距离范围内光强分布近似为贝塞尔分布,符合无衍射光束的特性,由衍射积分理论的数值模拟和几何光学近似得到的无衍射光束的最大准直距离以及棱角与光阑半径对最大准直距离的影响和实验结果基本吻合。
Based on Huygens-Fresnel diffraction integral theory,the maximum collimating distance Zmax of nondiffracting beam is derived, and the optical intensity distribution on the axis with different distance is measured, and the effect of both the radius of the aperture and the open angle of the axicon on the maximum non-diffraction distance is discussed. The experiments show that within the Zmax the optical intensity distribution on the axis is constant. The results agree with the beam corresponding to a diffraction free beam. It is shown that there is an agreement between the numerical simulation and geometrical optics approximation for the Zmax, and so is the effect of both the radius of the aperture and the open angle of the axicon on the maximum non-diffraction distance.
出处
《科技信息》
2008年第34期62-63,共2页
Science & Technology Information
关键词
无衍射J0光束
轴棱锥
棱角
光阑半径
最大准直距离
non-diffracting beams, axicon
radius of aperture
open angle
maximum collimating distance