Orbital angular momentum complex spectrum analyzer for vortex light based on the rotational Doppler effect  

作　　者：Hai-Long Zhou Dong-Zhi Fu Jian-Ji Dong Pei Zhang Dong-Xu Chen Xin-Lun Cai Fu-Li Li Xin-Liang Zhang 

机构地区：[1]Wuhan National Laboratory for Optoelectronics,School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China [2]Key Laboratory for Quantum Information and Quantum Optoelectronic Devices,Shaanxi Province,Department of Applied Physics,Xi’an Jiaotong University,Xi’an 710049,China [3]State Key Laboratory of Optoelectronic Materials and Technologies and School of Physics and Engineering,Sun Yatsen University,Guangzhou 510275,China

出　　处：《Light(Science & Applications)》2016年第1期88-95,共8页光（科学与应用)（英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2011CB301704);the Program for New Century Excellent Talents of the Ministry of Education of China(Grant No.NCET-11-0168);the Foundation for the Author of National Excellent Doctoral Dissertation of China(Grant No.201139);the National Natural Science Foundation of China(Grant No.11174096,11374008,11534008 and 61475052);the Foundation for Innovative Research Groups of the Natural Science Foundation of Hubei Province(Grant No.2014CFA004).

摘　　要：The ability to measure the orbital angular momentum(OAM)distribution of vortex light is essential for OAM applications.Although there have been many studies on the measurement of OAM modes,it is difficult to quantitatively and instantaneously measure the power distribution among different OAM modes,let alone measure the phase distribution among them.In this work,we propose an OAM complex spectrum analyzer that enables simultaneous measurements of the power and phase distributions of OAM modes by employing the rotational Doppler effect.The original OAM mode distribution is mapped to an electrical spectrum of beat signals using a photodetector.The power and phase distributions of superimposed OAM beams are successfully retrieved by analyzing the electrical spectrum.We also extend the measurement technique to other spatial modes,such as linear polarization modes.These results represent a new landmark in spatial mode analysis and show great potential for applications in OAM-based systems and optical communication systems with mode-division multiplexing.

关 键 词：mode analysis orbital angular momentum rotational Doppler effect 

分 类 号：TN9[电子电信—信息与通信工程]