Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7735e.100m&link_type=abstract
Ground-based and Airborne Instrumentation for Astronomy III. Edited by McLean, Ian S.; Ramsay, Suzanne K.; Takami, Hideki. Pro
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Boccaletti Anthony
Dohlen Kjetil
Dorrer Christophe
Kasper Markus
Martinez Patrice
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