High-contrast imaging at first light of the GMT: optimized coatings enabling high-throughput observations for GMagAO-X

Jaren N. Ashcraft; Sebastiaan Y. Haffert; Laird Close; Olivier Durney; Jared Males; Maggie Kautz

doi:10.1117/12.3020707

26 August 2024 High-contrast imaging at first light of the GMT: optimized coatings enabling high-throughput observations for GMagAO-X

Jaren N. Ashcraft, Sebastiaan Y. Haffert, Laird Close, Olivier Durney, Jared Males, Maggie Kautz

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 1310065 (2024) https://doi.org/10.1117/12.3020707
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The Giant Magellan Telescope’s (GMT) high angular resolution and light collecting area are key in enabling its mission to characterize the atmospheres of rocky exoplanets. The high-contrast imaging instrument GMagAO-X will enable high-angular resolution due to its advanced wavefront sensing and control (WFS&C) techniques and coronagraphic imaging capability. However, to support high-fidelity WFS&C many intermediate optics are necessary. For commercially available coatings, the cumulative throughput of GMagAO-X ranges from 5-15%. To enhance the throughput of GMagAO-X we present a design study of customized optical coatings that enable a high broadband throughput. We implement these coatings in a polarization ray trace model of the GMagAO-X optics and investigate whether (chromatic) polarization aberrations are introduced by these coatings. These coating designs will increase the throughput of GMagAO-X significantly and bring the detection of bio-signatures within reach. We will present the results of our coating optimization strategy for high-contrast imaging instruments.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jaren N. Ashcraft, Sebastiaan Y. Haffert, Laird Close, Olivier Durney, Jared Males, and Maggie Kautz "High-contrast imaging at first light of the GMT: optimized coatings enabling high-throughput observations for GMagAO-X", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 1310065 (26 August 2024); https://doi.org/10.1117/12.3020707

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KEYWORDS

Design

Optical coatings

Coronagraphy

Polarization

Silver

Thin films

Magnesium fluoride

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