Experimental serial coupling of 1DDLC coronagraph and PFN achieves 3.5e-5 contrast at 6% wavelength offset, 20x better than coronagraph alone.
Improved High Contrast Imaging with On-Axis Telescopes using a Multi-Stage Vortex Coronagraph
2 Pith papers cite this work. Polarity classification is still indexing.
2
Pith papers citing it
abstract
The vortex coronagraph is one of the most promising coronagraphs for high contrast imaging because of its simplicity, small inner working angle, high throughput, and clear off-axis discovery space. However, as with most coronagraphs, centrally-obscured on-axis telescopes degrade contrast. Based on the remarkable ability of vortex coronagraphs to move light between the interior and exterior of pupils, we propose a method, based on multiple vortices, that, without sacrificing throughput, reduces the residual light leakage to (a/A)^n, with n >=4, and a and A being the radii of the central obscuration and primary mirror, respectively. This method thus enables high contrasts to be reached even with an on-axis telescope.
fields
astro-ph.IM 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
Liquid-crystal VVCs with multi-grating designs reach 3e-4 leakage over 10% bandwidth and 2e-8 lab contrast, with successful space-environment testing.
citing papers explorer
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Combining a Diffraction-Limited Coronagraph with Fiber Nulling: A Demonstration of Serially Coupling Different Nullers
Experimental serial coupling of 1DDLC coronagraph and PFN achieves 3.5e-5 contrast at 6% wavelength offset, 20x better than coronagraph alone.
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SUPPPPRESS: Prototyping and testing liquid-crystal vector vortex coronagraphs with reduced polarization leakage
Liquid-crystal VVCs with multi-grating designs reach 3e-4 leakage over 10% bandwidth and 2e-8 lab contrast, with successful space-environment testing.