光子学报, 2019, 48 (7): 0726001, 网络出版: 2019-07-31  

完美涡旋光拓扑荷的原位测定

Topological Charge in Situ Measuring of Perfect Optical Vortex
作者单位
1 中国科学院西安光学精密机械研究所 瞬态光学与光子技术国家重点实验室, 西安 710119
2 中国科学院大学, 北京 100049
摘要
为了实现对完美涡旋光拓扑荷的快速测定, 提出了一种同轴干涉测定方法, 其基本思路是利用一个空间光调制器同时调制产生完美涡旋光与球面波, 调制球面波的发散角使两者发生干涉, 利用干涉条纹数来实现拓扑荷数的直接快速测定.理论模拟和实验测定结果表明, 利用该方法得到的干涉条纹可以测定完美涡旋光的拓扑荷, 包括大小与符号.进一步, 利用该方法测量了完美涡旋光阵列与球面波的干涉图样, 实现了对每个完美涡旋光的拓扑荷的快速测定.该原位测定方法简单、有效, 对于利用完美涡旋光实现轨道角动量控制和信息编码等应用具有参考意义.
Abstract
In order to determine the topological charge of a Perfect Optical Vortex (POV), a in-line interferometric measurement method was presented. The basic idea is to use a spatial light modulator to produce a POV and a spherical wave simultaneously. By modulating the divergence angle of the spherical wave, the POV and the spherical wave interfer. The number of interference fringes is used to realize the direct and rapid measurement of topological charge. Simulated and experimental results show that the interference fringes obtained by the method can be used to determine the topological charge of POVs, including the magnitude and symbol. Furthermore, the proposed in situ method is demonstrated to determine the topological charge of the POV array by measuring the interference pattern of a perfect vortex array and a spherical wave. The proposed in situ method is simple and effective. Therefore, it is of a significance for the application of orbital angular momentum control and information coding based on POVs.

任斐斐, 梁言生, 蔡亚楠, 何旻儒, 雷铭, 姚保利. 完美涡旋光拓扑荷的原位测定[J]. 光子学报, 2019, 48(7): 0726001. REN Fei-fei, LIANG Yan-sheng, CAI Ya-nan, HE Min-ru, LEI Ming, YAO Bao-li. Topological Charge in Situ Measuring of Perfect Optical Vortex[J]. ACTA PHOTONICA SINICA, 2019, 48(7): 0726001.

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