Vortex-phase filtering technique for extracting spatial information from unresolved sources

Abstract

A white light vortex coronagraph was used to experimentally achieve sub-resolution detection. The angular location of the centroid, $\gamma$, and the angular extent of circular pinhole sources, $\Theta$, were measured to within errors of $\delta \gamma =\pm 0.015\lambda /D$ and $\delta \Theta =\pm 0.026\lambda /D$. 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.

7 pages, 8 figures

References in corpus (4)

• Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
• Theoretical Limits on Extrasolar Terrestrial Planet Detection with Coronagraphs
• Optical vortex coronagraphs on ground-based telescopes
• A Broadband Scalar Vortex Coronagraph

Cited by in corpus (4)

• Astrophotonics: astronomy and modern optics
• Minimizing the polarization leakage of geometric-phase coronagraphs with multiple grating pattern combinations
• Scalar vortex coronagraph mask design and predicted performance
• Vortex fiber nulling for exoplanet observations: conceptual design, theoretical performance, and initial scientific yield predictions