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L- and M-band annular groove phase mask in lab performance assessment on the vortex opticaldemonstrator for coronagraphic applications
Université de Liège, Belgium.
Université de Liège, Belgium.
Observatoire de Paris, CNRS, Sorbonne Université, Univ. Paris Diderot, France.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
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2019 (English)In: Journal of Astronomical Telescopes, Instruments, and Systems, ISSN 2329-4221, Vol. 5, no 2, p. 1-8, article id 025001Article in journal (Refereed) Published
Abstract [en]

Coronagraphy is a high-contrast imaging technique that aims to reduce the blinding glare of a star to detect a potential companion in its close environment. Vortex phase mask coronagraphy is widely recognized as one of the most promising approaches. The vortex optical demonstrator for coronagraphic application (VODCA) is a test bench currently developed at the University of Liège. Its main goal is to optically characterize infrared phase masks, in particular vortex masks. We detail the layout and salient features of VODCA and present the performance of the latest L-band (3575 to 4125 nm) and M-band (4600 to 5000 nm) annular groove phase masks (AGPMs) manufactured by our team. We obtain the highest rejection ratio ever measured for an AGPM at L-band: 3.2  ×  103 in a narrowband filter (3425 to 3525 nm) and 2.4  ×  103 in a broad L-band filter. By providing measurements close to the intrinsic limit of science-grade AGPMs, VODCA proves to be a step forward in terms of the evaluation of vortex phase masks performance.

Place, publisher, year, edition, pages
2019. Vol. 5, no 2, p. 1-8, article id 025001
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-360447DOI: 10.1117/1.JATIS.5.2.025001ISI: 000481881700034OAI: oai:DiVA.org:uu-360447DiVA, id: diva2:1247841
Funder
EU, European Research Council, 337569Available from: 2018-09-13 Created: 2018-09-13 Last updated: 2019-09-30Bibliographically approved

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Piron, PierreVargas Catalan, ErnestoKarlsson, Mikael

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