基于光楔阵列产生光学涡旋阵列的研究  

Research on the Generation of Optical Vortex Array Using a Wedge Array

作　　者：柴忠洋 王祺昌 曾臻[1] 张效栋[1] 房丰洲[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津微纳制造工程技术中心,天津300072

出　　处：《光子学报》2015年第4期71-75,共5页Acta Photonica Sinica

基　　金：国家重点基础研究发展计划项目(No.2011CB706700)资助

摘　　要：在研究光楔衍射法产生单涡旋的基础上,基于长条形光楔阵列,提出了利用光束阵列衍射产生涡旋阵列的方法.该方法要求光束阵列在平行于光楔边缘方向上的光束间距等于光束直径的整数倍.利用超精密机床采用一体化加工法加工了光楔阵列元件,验证了该方法的可行性.利用空间光调制器快速灵活调整光束阵列的优点,搭建了借助空间光调制器加载达曼光栅衍射产生所需光束阵列的实验光学系统.针对光束阵列与光楔阵列的匹配问题,研究了达曼光栅掩模图基本单元对光束阵列的调控,获得了可调结构的光束阵列.实验产生了拓扑荷一致的光学涡旋阵列,与仿真结果相一致,证明所提方法的有效性.Based on the study of the generation of single optical vortex by the diffraction of optical wedge,an optical vortex array generation method was proposed.The diffraction of optical array by the rectangular optical wedge array was used to generate vortex array in the proposed method.If the spacing between adjacent beams in the direction parallelled to the wedge edge is equal to an integer times of the beam diameter,the beam array irradiation on the rectangular optical wedge array will produce vortex array.Then simulation was implemented for the verification of the feasibility.The wedge array was fabricated practically by the ultra-precision machine with integrated processing method.As the spatial light modulator can adjust beam array fast and flexibly,the experimental system was established,in which the spatial light modulator was used to generate the desired beam array by Dammam grating diffraction.The regulation of basic unit of Dammam grating mask pattern on beam array was researched in order to match the beam array and wedge array.The beam array with adjustable structure was obtained finally.The optical vortex array with same topological charge was generated successfully.The experimental and the simulative results have good agreement,which proved that the optical wedge array can generate vortex array effectively.

关 键 词：物理光学 光学涡旋 光楔衍射法 光楔阵列 光束阵列 空间光调制器 达曼光栅 

分 类 号：O431.6[机械工程—光学工程]