Towards understanding interactions between the AO system and segment co-phasing with the vector-Zernike wavefront sensor on Keck

Maïssa Salama; Charlotte E. Guthery; Vincent Chambouleyron; Rebecca Jensen-Clem; J. Kent Wallace; Mitchell Troy; Jacques-Robert Delorme; Daren Dillon; Daniel Echeverri; Yeyuan (Yinzi) Xin; Wen Hao (Jerry) Xuan; Nemanja Jovanovic; Dimitri Mawet; Peter L. Wizinowich; Rachel Bowens-Rubin

doi:10.1117/12.3019373

27 August 2024 Towards understanding interactions between the AO system and segment co-phasing with the vector-Zernike wavefront sensor on Keck

Maïssa Salama, Charlotte E. Guthery, Vincent Chambouleyron, Rebecca Jensen-Clem, J. Kent Wallace, Mitchell Troy, Jacques-Robert Delorme, Daren Dillon, Daniel Echeverri, Yeyuan (Yinzi) Xin, Wen Hao (Jerry) Xuan, Nemanja Jovanovic, Dimitri Mawet, Peter L. Wizinowich, Rachel Bowens-Rubin

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130971P (2024) https://doi.org/10.1117/12.3019373
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

We extend our previous demonstration of the first on-sky primary mirror segment closed-loop control on Keck using a vector-Zernike wavefront sensor (vZWFS), which improved the Strehl ratio on the NIRC2 science camera by up to 10 percentage points. Segment co-phasing errors contribute to Keck contrast limits and will be necessary to correct for the segmented Extremely Large Telescopes and future space missions. The goal of the post-AO vZWFS on Keck is to monitor and correct segment co-phasing errors in parallel with science observations. The ZWFS is ideal for measuring phase discontinuities and is one of the most sensitive WFSs, but has limited dynamic range. The Keck vZWFS consists of a metasurface mask imposing two different phase shifts to orthogonal polarizations, split into two pupil images, extending its dynamic range. We report on the vZWFS closed-loop co-phasing performance and early work towards understanding the interactions between the AO system and segment phasing. We discuss a comparison of the AO performance when co-phasing by aligning segment edges, as is currently done at Keck, compared with aligning to the average phase over the segments, as is done by the vZWFS.

Conference Presentation

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

Citation Download Citation

Maïssa Salama, Charlotte E. Guthery, Vincent Chambouleyron, Rebecca Jensen-Clem, J. Kent Wallace, Mitchell Troy, Jacques-Robert Delorme, Daren Dillon, Daniel Echeverri, Yeyuan (Yinzi) Xin, Wen Hao (Jerry) Xuan, Nemanja Jovanovic, Dimitri Mawet, Peter L. Wizinowich, and Rachel Bowens-Rubin "Towards understanding interactions between the AO system and segment co-phasing with the vector-Zernike wavefront sensor on Keck", Proc. SPIE 13097, Adaptive Optics Systems IX, 130971P (27 August 2024); https://doi.org/10.1117/12.3019373

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