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Proceedings Paper

Halftoning for high-contrast imaging: design, analysis, and testing of microdot coronagraphs for the SPHERE and EPICS instruments
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Paper Abstract

Controlling the amplitude of light is crucial for many scientific applications, such as imaging systems, astronomical instruments, optical testing, or laser physics. We provide an overview of the halftoning technique - the process of displaying a continuous image with binary dots - for application to coronagraphy. Customized filters with spatially varying transmission are produced using a binary array of metal pixels (namely microdot masks) that offers excellent control of the local transmission, with intrinsic achromaticity. Applications, design guidelines, and tests of near-IR prototypes for both pupil and focal plane coronagraphic devices are presented in the context of the VLT-SPHERE and EELT EPICS instruments.

Paper Details

Date Published: 15 July 2010
PDF: 10 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77352Y (15 July 2010); doi: 10.1117/12.857172
Show Author Affiliations
Patrice Martinez, European Southern Observatory (Germany)
Christophe Dorrer, Aktiwave LLC (United States)
Markus Kasper, European Southern Observatory (Germany)
Anthony Boccaletti, LESIA, Observatoire de Paris-Meudon (France)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)

Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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