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Experimental test of a micro-mirror array as an adaptive apodizer for high-contrast imaging
Author(s): Alexis Carlotti; David Mouillet; Jean-Jacques Correia; Laurent Jocou; Guillaume Bourdarot; Etienne le Coarer; Thierry Forveille; Xavier Bonfils; Thibaut Moulin
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Paper Abstract

Direct imaging systems are now designed for specific telescope apertures and specific high-contrast diffraction 2D patterns. Current coronagraphic masks are not adaptive components, and different apertures and science requirements must result in different masks, which always come in a small number in a real-life instrument. Adaptive components would make it possible to adapt to changes in the aperture transmission (which will likely happen on a daily basis with the near future highly segmented telescopes, such as ESO's ELT), as well as to reconfigure at will the high-contrast area for different observation modes. In particular, the prospect of characterizing planets with a known position at a high spectral resolution pushes for adaptive coronagraphs capable of creating high-contrast in a small area of the image plane. Micro-mirror arrays are commercially available MOEMS that may be used as binary adaptive amplitude mask. They adaptively redirect light in either one of two directions using millions of micron-sized, bi-stable mirrors. Their spatial resolutions is compatible with 2D binary apodization patterns, in addition to Lyot stops. We have conducted a series of laboratory tests to assess the compatibility of an off-the-shelf micro-mirror array with high-contrast imaging requirements. This communication first presents the context and the scope of the project. It then details the results of our initial characterization of the device, in particular a measurement of the wavefront aberrations and of the level of scattered light that it introduces. Finally, it presents high-contrast point-spread functions obtained with this device, and summarizes the limitations of current components to derive a possible roadmap for the development of scientific-grade adaptive pupil masks.

Paper Details

Date Published: 10 July 2018
PDF: 14 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107062M (10 July 2018); doi: 10.1117/12.2311974
Show Author Affiliations
Alexis Carlotti, Univ. Grenoble Alpes, CNRS, IPAG (France)
David Mouillet, Univ. Grenoble Alpes, CNRS, IPAG (France)
Jean-Jacques Correia, Univ. Grenoble Alpes, CNRS, IPAG (France)
Laurent Jocou, Univ. Grenoble Alpes, CNRS, IPAG (France)
Guillaume Bourdarot, Univ. Grenoble Alpes, CNRS, IPAG (France)
Etienne le Coarer, Univ. Grenoble Alpes, CNRS, IPAG (France)
Thierry Forveille, Univ. Grenoble Alpes, CNRS, IPAG (France)
Xavier Bonfils, Univ. Grenoble Alpes, CNRS, IPAG (France)
Thibaut Moulin, Univ. Grenoble Alpes, CNRS, IPAG (France)

Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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