Measuring the orbital angular momentum of elliptical vortex beams by using a slit hexagon aperture |
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| Authors: | Yongxin Liu Jixiong Pu |
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| Institution: | 1. College of Information Science & Engineering, Institute of Optics & Photonics, Huaqiao University, Xiamen, Fujian 361021, China;2. Institute of Laser Physics and Chemistry, Sichuan University, Chengdu, Sichuan 610064, China;1. School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, Hubei 434023, China;2. School of Physics and Electronics, Central South University, Changsha 410083, China;3. Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia;1. Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China;2. Department of Science, Taiyuan Institute of Technology, Taiyuan 030008, China;1. Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Insititute of Modern Optics, Nankai University, Tianjin 300350, China;2. Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Tianjin 300350, China;3. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;4. Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China |
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| Abstract: | The far-field diffraction pattern of an elliptical vortex beam by a slit hexagon aperture is investigated theoretically and experimentally. It is found that the number of the dark spots or stripes in the Fraunhofer diffraction intensity distribution is just equal to the topological charge value of the measured optical vortex, and that the centre of each dark spot or stripe is just a phase singularity point. Based on this property, it provides us a simple way to detect the orbital angular momentum (OAM) of an optical vortex beam. |
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