光子学报, 2012, 41 (8): 956, 网络出版: 2012-08-15   

新型棱镜产生近似无衍射线结构光

Novel Prism Generating Non-diffracting-like Linear Structured Beam
作者单位
泉州师范学院 物理与信息工程学院,福建 泉州 362000
摘要
为了改善三角棱镜系统产生近似无衍射线结构光的能量均匀分布在若干条光斑上,不适合直接应用于三维表面测量且中心光斑对能量利用率较低的问题,提出了一种新型光学元件.该元件在三角棱镜的基础上,通过在其底部胶合一个与原三角棱镜底面大小相等,横截面为等腰梯形的凸台制成.采用几何光学的理论对新型光学元件的光束变换特性进行分析,结果表明其可以等效为两个不同底角三角棱镜的组合,平面光束通过新型光学元件后将产生中心光斑较强的近似无衍射线结构光.由衍射积分理论分析和模拟了新型光学元件后的空间光强分布特性.仿真的结果表明,衍射积分分析的结果与几何光学分析的结果是一致的:新型光学元件可以产生一种性能更好的近似无衍射线结构光.并且通过改变棱镜的结构参量,能够方便地调节光束的中心光斑尺寸、近似无衍射范围等参量.
Abstract
A novel optical element is presented for solving the problems that energy of non-diffracting-like linear structured beam generated by normal triangular-section prism is evenly distributed and not suitable to be used to three-dimensional surface measurement directly and energy efficiency of central spot is lower. This element is designed by gluing a platform with isosceles trapezoid section on the bottom of triangular-section prism. The beam transformation property of this element is analyzed with geometrical optics theory, and the conclusion shows that its property is the same as the combination of two normal triangular-section prisms with different bottom corner. When a plane wave illuminates on the novel optical element, non-diffracting-like linear structured beam which has higher intensity in the central spot is formed. Finally the intensity distribution is simulated by diffraction and interference theory. The results show that the conclusion of diffraction and interference theory is consistent with the conclusion of geometrical optics theory, and a better non-diffracting-like linear structured beam is generated by this novel optical element. Parameters that the central spot size of beam, non-diffracting range and so on can be adjusted easily through changing the structural parameters of the prism.
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吴志伟. 新型棱镜产生近似无衍射线结构光[J]. 光子学报, 2012, 41(8): 956. WU Zhi-wei. Novel Prism Generating Non-diffracting-like Linear Structured Beam[J]. ACTA PHOTONICA SINICA, 2012, 41(8): 956.

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