Measuring the OAM spectrum of a fractional helical beam in a single shot  

作　　者：TUSHAR SARKAR JIAPENG CAI XIANG PENG WENQI HE 

机构地区：[1]Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518060,China [2]Shenzhen Key Laboratory of Intelligent Optical Measurement and Detection,Shenzhen University,Shenzhen 518060,China

出　　处：《Photonics Research》2024年第11期2726-2732,共7页光子学研究(英文版)

基　　金：National Natural Science Foundation of China(62475164);Sino-German Center for Research Promotion project(M-0044);Basic and Applied Basic Research Foundation of Guangdong Province(2024A1515010370)。

摘　　要：We propose and experimentally demonstrate a new technique,to our knowledge,to precisely measure the orbital angular momentum(OAM)spectrum of the fractional helical beam in a single shot.This is realized using a singlepath interferometer scheme combined with space division multiplexing and polarization phase-shifting.Such a combination enables the single-shot recording of multiple phase-shifted interferograms,which leads to extracting the phase profile of the incident fractional helical beam.Furthermore,by adopting an orthogonal projection method,this measured phase is utilized to evaluate the corresponding OAM spectrum.To test the efficacy,a set of simulations and experiments for different fractional helical beams is demonstrated.The proposed method shows enormous potential to characterize the OAM spectrum in real time.

关 键 词：OAM INTERFEROMETER POLARIZATION 

分 类 号：TN9[电子电信—信息与通信工程]