中国激光, 2019, 46 (1): 0104008, 网络出版: 2019-01-27
复合涡旋光束拓扑荷数测量的仿真研究 下载: 835次
Simulation for Measuring the Topological Charges of Composite Vortex Beams
测量 复合涡旋光束 拓扑荷数 衍射 椭圆形光阑 measurement composite vortex beams the topological charge diffraction elliptic aperture
摘要
针对复合涡旋光束拓扑荷信息测量的问题, 提出了一种利用其光强分布特征及经遮挡部分方位角的椭圆形光阑的衍射图样检测各子光束携带拓扑荷信息的方法。仿真结果表明:复合光束光强分布图中亮条纹数目和拖尾方向分别表征子光束拓扑荷差的绝对值和较高阶拓扑荷的符号; 衍射图样中暗条纹数目和条纹分布特点分别反映低阶拓扑荷的大小和符号。该方法可用于复合涡旋光束拓扑荷信息的检测。
Abstract
The measurement of the topological charges of a composite vortex beam is challenging. Therefore, this study proposes a method to detect the orbital angular momentum of each sub-beam using the light intensity distribution characteristics and diffraction patterns with an elliptical aperture occluding partial azimuth. Simulation results reveal that the number of bright stripes and the direction of the tail in the intensity distribution of the composite beam represent the absolute value of the topological charge difference and the symbols of the higher order topological charge, respectively. The number of dark stripes and their distribution characteristics in the diffraction patterns reflect the size and symbol of the low-order topological charge, respectively. Thus, the proposed method can successfully detect the topological charges of composite vortex beams.
毛宁, 韦宏艳, 蔡冬梅, 贾鹏. 复合涡旋光束拓扑荷数测量的仿真研究[J]. 中国激光, 2019, 46(1): 0104008. Mao Ning, Wei Hongyan, Cai Dongmei, Jia Peng. Simulation for Measuring the Topological Charges of Composite Vortex Beams[J]. Chinese Journal of Lasers, 2019, 46(1): 0104008.