近场拉盖尔-高斯光束传输参数的双缝干涉测量实验

发布时间：2018-01-10 00:12

本文关键词：近场拉盖尔-高斯光束传输参数的双缝干涉测量实验　出处：《应用光学》2017年01期 　论文类型：期刊论文

【摘要】：拉盖尔-高斯(Laguerre-Gaussian,LG)光束具有轨道角动量,分析近场条件下LG光束通过含光阑光学系统传输的解析公式,对不同阶LG光束通过双缝时双缝间的相位差变化进行了计算。利用计算机生成叉形衍射光栅显示在空间光调制器上,基模高斯光束产生衍射,得到不同阶次LG涡旋光束,通过CCD采集LG空心光束的光斑及双缝干涉后的图样,实现对LG光束传输轨道角动量特性的实验测量。在确定光束束径下,分析了叉形衍射光栅密度、空心光束宽度半径比、双缝宽度等参数对双缝干涉条纹的影响,在距离激光器1m处的SLM上显示4mm×5mm叉形衍射光栅,光栅密度约为16lines/mm,可产生暗斑尺寸在0.5mm~0.9mm之间、宽度半径比为0.2的LG空心光束。LG光束通过双缝宽度0.2mm,双缝间距0.5mm的光栅,可以得到清晰的干涉条纹。研究结果为近场光通信中利用光学涡旋轨道角动量编码信息提供了理论依据。
[Abstract]:Laguerre-Gaussian LG) beam has orbital angular momentum. The analytical formula of LG beam propagating through an optical system with an aperture under near-field conditions is analyzed. The variation of phase difference between two slits is calculated when LG beams of different order pass through two slits. The cross diffraction grating generated by computer is displayed on the spatial light modulator and the fundamental mode Gao Si beam is diffracted. The LG vortex beam of different order is obtained, and the spot of LG hollow beam and the pattern of double slit interference are collected by CCD. The experimental measurement of the orbital angular momentum characteristics of LG beam is realized, and the beam diameter is determined. The influence of the parameters such as the density of the cross diffraction grating, the ratio of the width radius of the hollow beam and the width of the double slit on the interference fringes is analyzed. The 4mm 脳 5mm cross diffraction grating is displayed on the SLM at 1 m distance of the laser. The grating density is about 16ils / mm, and the size of dark spot can be between 0.5 mm and 0.9 mm. The LG hollow beam with a radius ratio of 0.2. The LG beam passes through a grating with a double slit width of 0.2 mm and a double slit spacing of 0.5 mm. The results provide a theoretical basis for the use of optical vortex orbit angular momentum coding information in near-field optical communication.
【作者单位】：西安工业大学光电工程学院;
【基金】：陕西省教育厅科学研究项目(14JK1350)
【分类号】：O436.1
【正文快照】： 引言当激光光束含有角向相关的位相(扭转位相或螺旋位相)分布时,波矢量具有方向性并且绕着暗中空的涡旋中心旋转,使光束携带与角向位相分布有关的轨道角动量,携带轨道角动量的光束被称为“光学涡旋”(optical vortices)[1-3]。LG光束是一种典型的光学涡旋,具有固有的光轨道角

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