2017/10/09 by Jasmine M. Andersen, Jasmine M. Knudsen, Samuel N. Alperin +5 · 1 citation
Engineering · Physics and Astronomy · #Angular momentum #Beam (structure) #Computer science #Digital Holography and Microscopy #Holography #Light beam #Measure (data warehouse) #Near-Field Optical Microscopy #Optical modulator #Optical vortex #Optics #Orbital Angular Momentum in Optics #Phase (matter) #Phase modulation #Phase noise #Physics #Spatial frequency #Spatial light modulator #Structured light #physics.optics
paper · pdf · doi:10.1364/ao.58.000404
arxiv created 2017/10/09 · openalex publication_date 2019/01/07 · arxiv updated 2022/03/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
We use phase-shifting digital holography to measure the amplitude and phase of twisted light. In our experiment, a spatial light modulator generates the studied vortex beams in addition to a co-propagating reference beam with a controllable relative phase. We show complex field measurements for single and superposition Laguerre Gaussian (LG) modes, demonstrate full modal decompositions into LG and orbital angular momentum (OAM) power spectral bases, provide error analysis and demonstrate high insensitivity to detector misalignment to show the robustness of the technique. This enables rapid determination of OAM spectra with low uncertainty, allowing us to report the first vortex beams with 99.9% purity.