Halftoning: from the printing industry to high-contrast imaging instruments

Details Halftoning: from the printing industry to high-contrast imaging instruments Halftoning: from the printing industry to high-contrast imaging instruments

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010lyot.confe..72m&link_type=abstract

Proceedings of the conference In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks. October 25 -

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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 technique used for hundred years in the printing industry as the process of generating a continuous tone image with only black and white 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 property. Applications, design guidelines, and testing of near-IR prototypes for both pupil (Apodized Pupil Lyot Coronagraphs) and focal plane (Band-Limited Coronagraphs) devices are presented in the context of the VLT-SPHERE and E-ELT EPICS instruments.

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