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A broadband scalar optical vortex coronagraph
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A broadband scalar optical vortex coronagraph
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Paper
A broadband scalar optical vortex coronagraph
2014
Overview
In recent years, new coronagraphic schemes have been proposed, the most promising being the optical vortex phase mask coronagraphs. In our work, a new scheme of broadband optical scalar vortex coronagraph is proposed and characterized experimentally in the laboratory. Our setup employs a pair of computer generated phase gratings (one of them containing a singularity) to control the chromatic dispersion of phase plates and achieves a constant peak-to-peak attenuation below 1:1000 over a bandwidth of 120 nm centered at 700 nm. An inner working angle of \\(\\lambda\\)/D is demonstrated along with a raw contrast of 11.5\\,magnitudes at 2\\(\\lambda\\)/D. A more compact setup achieves a peak-to-peak attenuation below 1:1000 over a bandwidth of 60 nm with the other results remaining the same.
Publisher
Cornell University Library, arXiv.org
Subject
