High-contrast imaging at first-light of the GMT: the wavefront sensing and control architecture of GMagAO-X

Sebastiaan Y. Haffert; Jared R Males; Laird M. Close; Maggie Y. Kautz; Olivier Durney; Olivier Guyon

doi:10.1117/12.3020623

3 September 2024 High-contrast imaging at first-light of the GMT: the wavefront sensing and control architecture of GMagAO-X

Sebastiaan Y. Haffert, Jared R Males, Laird M. Close, Maggie Y. Kautz, Olivier Durney, Olivier Guyon

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 1309758 (2024) https://doi.org/10.1117/12.3020623
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The Giant Magellan Adaptive Optics eXtreme (GMagAO-X) instrument is a first-light high-contrast imaging instrument for the Giant Magellan Telescope (GMT). GMagAO-X’s broad wavelength range and the large 25-meter aperture of the GMT creates new challenges: control of all 21.000 actuators; phasing GMT’s segmented primary mirror to nm levels; active control of atmospheric dispersion to sub milli-arcsecond residuals; no chromatic pupil shear to minimize chromatic compensation errors; integrated focal plane wavefront sensing and control (WFS&C). GMagAO-X will have simultaneous visible and infra-red WFS channels to control the 21.000 actuator DM. The infra-red arm will be flexible by incorporating switchable sensors such as the pyramid or Zernike WFS. One innovation that we developed for GMagAO-X is the Holographic Dispersed Fringe Sensor that measures differential piston. We have also developed several integrated coronagraphic wavefront sensors to control non-common path aberrations exactly where we need to sense them. We will discuss the key components of the WFS&C strategies for GMagAO-X that address the challenges posed by the first high-contrast imaging system on the ELTs.

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

Citation Download Citation

Sebastiaan Y. Haffert, Jared R Males, Laird M. Close, Maggie Y. Kautz, Olivier Durney, and Olivier Guyon "High-contrast imaging at first-light of the GMT: the wavefront sensing and control architecture of GMagAO-X", Proc. SPIE 13097, Adaptive Optics Systems IX, 1309758 (3 September 2024); https://doi.org/10.1117/12.3020623

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KEYWORDS

Wavefront sensors

Coronagraphy

Design

Adaptive optics

Reflection

Telescopes

Equipment

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