2017/03/31 by Peng Zhao, Shikang Li, Yu Wang +6 · 30 citations
Engineering · Mathematics · Physics and Astronomy · #Angular momentum #Beam (structure) #Digital Holography and Microscopy #Dispersion (optics) #Geometry #Lens (geology) #Light beam #Mathematics #Optical Polarization and Ellipsometry #Optical axis #Optics #Orbital Angular Momentum in Optics #Orbital angular momentum of light #Physics #Quantum mechanics #Spectrum (functional analysis) #Tilt (camera) #Topological quantum number #Total angular momentum quantum number #physics.optics
paper · pdf · doi:10.1038/s41598-017-07734-3
published in Scientific Reports 7(1), 7873 (Nature Portfolio)
arxiv created 2017/04/06 · openalex publication_date 2017/08/07 · arxiv updated 2020/04/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract The axis tilt of light beam in optical system would introduce the dispersion of orbital angular momentum (OAM) spectrum. To deal with it, a two-step method is proposed and demonstrated. First, the tilt angle of optical axis is identified with a deduced relation between the tilt angle and the variation of OAM topological charges with different reference axes, which is obtained with the help of a charge coupled device (CCD) camera. In our experiments, the precision of measured tilt angle is about 10 −4 rad with topological charges of −3~3. With the measured angle value, the additional phase delay due to axis tilt can be calculated so that the dispersion of OAM spectrum can be corrected with a simple formula while the optical axis is not aligned. The experimental results indicate that the original OAM spectrum has been successfully extracted for not only the pure state but also the superposed OAM states.