Halftoning for High-Contrast Imaging: design, analysis, and testing of microdot coronagraphs for the SPHERE and EPICS instruments

被引：0
|
作者：
Martinez, Patrice [1 ]
Dorrer, Christophe [2 ]
Kasper, Markus [1 ]
Boccaletti, Anthony [3 ]
Dohlen, Kjetil [4 ]
机构：
[1] European Southern Observ, Adapt Opt Dept, Instrumental Div, Karl Schwarzschild Str 2, D-85748 Garching, Germany
[2] Aktiwave, Rochester, NY 14620 USA
[3] Observ Paris Meudon LESIA, F-92190 Meudon, France
[4] Observ Marseille LAM, F-13388 Marseille, France
来源：
GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY III | 2010年 / 7735卷
关键词：
high angular resolution; coronagraphy; halftoning; SPHERE; EPICS; PUPIL LYOT CORONAGRAPH;
D O I：
10.1117/12.857172
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 E-ELT EPICS instruments.
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页数：10
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