High-contrast imaging at first-light of the GMT: the PDR optical and mechanical design for the GMagAO-X ExAO system and results from the HCAT testbed with an HDFS phased parallel DM prototype

Laird M. Close; Olivier Durney; Jared R. Males; Maggie Y. Kautz; Sebastiaan Y. Haffert; Adam Fletcher; Alexander D. Hedglen; Victor Gasho; Avalon McLeod; Mark Sullivan; Olivier Guyon; Jamison Noenickx; Doug Kelly; John Ford

doi:10.1117/12.3018094

3 September 2024 High-contrast imaging at first-light of the GMT: the PDR optical and mechanical design for the GMagAO-X ExAO system and results from the HCAT testbed with an HDFS phased parallel DM prototype

Laird M. Close, Olivier Durney, Jared R. Males, Maggie Y. Kautz, Sebastiaan Y. Haffert, Adam Fletcher, Alexander D. Hedglen, Victor Gasho, Avalon McLeod, Mark Sullivan, Olivier Guyon, Jamison Noenickx, Doug Kelly, John Ford

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 1309726 (2024) https://doi.org/10.1117/12.3018094
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

ELTs have the potential for imaging reflected light from habitable rocky planets around M-stars. To address that exciting science we present the PDR level optical-mechanical design for a high-contrast coronagraphic instrument for the 25.4m Giant Magellan Telescope (GMT) called GMagAO-X. It is a first light extreme adaptive optics (ExAO) coronagraphic instrument which mounts to the sector D folded port of the GMT. To meet the strict ExAO fitting and servo error requirement (<90nm rms WFE), GMagAO-X must have 21,000 actuator DM capable of >2KHz update speeds. To minimize wavefront/segment piston error GMagAO-X has an interferometric beam combiner on a vibration isolated table, as part of this 21,000 actuator “parallel DM”. Segment/petal piston errors are continuously sensed by a novel Holographic Dispersed Fringe Sensor (HDFS). In addition to a coronagraph, it has a post-coronagraphic Lyot Low Order WFS (LLOWFS) to sense non-common path (NCP) errors. The LLOWFS drives a non-common path DM (NCP DM) to correct those NCP errors. GMagAO-X obtains high-contrast science and wavefront sensing in the visible or the NIR. Here we present our successful, externally reviewed (Feb. 2024), PDR optical-mechanical design that satisfies GMagAO-X’s top-level science requirements and is compliant with the GMT instrument requirements/ICDs and only requires COTS parts and readily available 2-5 inch sized optics. We have also prototyped the parallel DM and the HDFS phasing sensor on the HCAT testbed. We show initial phased HCAT testbed results for the parallel DM and initial on-sky phasing results for HDFS.

Conference Presentation

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

Citation Download Citation

Laird M. Close, Olivier Durney, Jared R. Males, Maggie Y. Kautz, Sebastiaan Y. Haffert, Adam Fletcher, Alexander D. Hedglen, Victor Gasho, Avalon McLeod, Mark Sullivan, Olivier Guyon, Jamison Noenickx, Doug Kelly, and John Ford "High-contrast imaging at first-light of the GMT: the PDR optical and mechanical design for the GMagAO-X ExAO system and results from the HCAT testbed with an HDFS phased parallel DM prototype", Proc. SPIE 13097, Adaptive Optics Systems IX, 1309726 (3 September 2024); https://doi.org/10.1117/12.3018094

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