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提出了一种利用柱面镜测量涡旋光束拓扑荷值的方法。首先,基于空间光调制器、利用计算全息法生成了拉盖尔-高斯(LG)涡旋光束;然后利用柱面镜对径向指数p=1,2,角向指数l=1~5的LG涡旋光束进行光束变换,实验结果表明:当涡旋光束通过柱面镜后,其中心暗核将发生劈裂,劈裂后的暗核数与涡旋光束的拓扑荷数值相等,以此实现拓扑荷值的测量。此外,为进一步验证该方法的准确性,利用涡旋光束与平面波干涉测量方法进行了对比分析;结果表明:基于柱面镜的涡旋光束拓扑荷值测量方法可有效测量LG涡旋光束的拓扑荷值;并且具有测试系统简单、光路调节简便的优点。
A method of measuring the topological charge of vortex beam with cylindrical mirror is proposed. Firstly, based on the spatial light modulator, a Laguerre-Gaussian (LG) vortex beam is generated by using the computational holography method. Then the cylindrical mirror is used to measure the radial exponent p = 1,2 and the angular exponent l = 1-5 The results show that when the vortex beam passes through the cylindrical mirror, the central dark nucleus will be split, and the number of dark nuclei after splitting is equal to the topological charge of the vortex beam Achieve the measurement of topological load value. In addition, in order to further verify the accuracy of the method, a comparative analysis is made between the vortex beam and the plane wave interference measurement method. The results show that the method based on the cylindrical mirror’s topological value of vortex beam topography can effectively measure the topology of the LG vortex beam Load value; and has the advantages of simple test system, easy adjustment of the optical path.