2014/01/31 by Garreth J. Ruane, Prachyathit Kanburapa, Jiaxuan Han +2
Engineering · Physics and Astronomy · #Centroid #Coronagraph #Digital Holography and Microscopy #Linear filter #Optical Polarization and Ellipsometry #Orbital Angular Momentum in Optics #Pinhole (optics) #Spatial filter #Spatial frequency #Stray light #Vortex #White light #physics.optics
paper · pdf · doi:10.1364/ao.53.004503
published as Appl. Opt. 53, 4503-4508 (2014) · 7 pages, 8 figures
openalex publication_date 2014/07/07 · arxiv created 2014/07/15 · arxiv updated 2014/07/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A white light vortex coronagraph was used to experimentally achieve sub-resolution detection. The angular location of the centroid γ, and the angular extent of circular pinhole sources Θ, were measured to within errors of δγ=±0.015λ/D and δΘ=±0.026λ/D. This technique has two advantages over conventional imaging: simple power measurements are made and shorter exposure times may be required to achieve a sufficient signal-to-noise ratio.