光学学报, 2008, 28 (4): 773, 网络出版: 2008-04-21   

圆锥透镜对倾斜球面波光束的衍射模式

Diffraction Mode of Axicon for Tilted Spherical Wave Beam
作者单位
1 北京航空航天大学 仪器科学与光电工程学院,北京 100083
2 中国航天科技集团第一研究院第12所, 北京 100854
摘要
由于球面波入射圆锥透镜所产生的出射光束具有焦深长和中心光斑直径较小的特点,适合激光通信以及长距离测量。在实际使用中,入射球面波很可能与圆锥透镜的光轴发生倾斜。研究了圆锥透镜对倾斜球面波光束的衍射特性,通过基尔霍夫衍射理论以及稳相法分析,分析了其径向衍射光场分布形式,并用计算机进行了仿真。使用了半径为15 mm、底角为1°的圆锥透镜进行实验,并对仿真结果进行了验证。仿真和实验证明,减小入射球面波曲率半径、出射光束传输距离和入射光束倾斜角都可以减弱入射光束倾斜对衍射图的影响。
Abstract
Using spherical wave beam to illuminate an axicon will result in a beam with small central spot and large focal depth, which is useful for laser communication and long-distance measurement. It is possible that the incident spherical wave beam is tilted with the optical axis of the axicon in practical measurement. Based on the Kirchholf diffraction theory and stationary phase method, the diffraction characteristic of an axicon for a tilted spherical wave beam is derived, and the radial energy distribution is also analyzed. Experiment and simulation are performed with an axicon with 15 mm radius and 1° basal angle. The experimental results are compared with the theoretical analysis and computer simulation. Simulation and experiment indicate that decreasing incident spherical wave′s radii of curvature, propagation distance and the tilting angle can weaken the tilting effect on image of diffraction.
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李萌, 张朵, 王中宇, 高晓颖. 圆锥透镜对倾斜球面波光束的衍射模式[J]. 光学学报, 2008, 28(4): 773. Li Meng, Zhang Duo, Wang Zhongyu, Gao Xiaoying. Diffraction Mode of Axicon for Tilted Spherical Wave Beam[J]. Acta Optica Sinica, 2008, 28(4): 773.

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