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

Patrice Martinez; Christophe Dorrer; Markus Kasper; Anthony Boccaletti; Kjetil Dohlen

doi:10.1117/12.857172

15 July 2010 Halftoning for high-contrast imaging: design, analysis, and testing of microdot coronagraphs for the SPHERE and EPICS instruments

Patrice Martinez, Christophe Dorrer, Markus Kasper, Anthony Boccaletti, Kjetil Dohlen

Author Affiliations +

Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 77352Y (2010) https://doi.org/10.1117/12.857172
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

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.

Citation Download Citation

Patrice Martinez, Christophe Dorrer, Markus Kasper, Anthony Boccaletti, and Kjetil Dohlen "Halftoning for high-contrast imaging: design, analysis, and testing of microdot coronagraphs for the SPHERE and EPICS instruments", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77352Y (15 July 2010); https://doi.org/10.1117/12.857172

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