A non-linear curvature wavefront sensor for the Subaru telescope’s AO3k system

K. Ahn; O. Guyon; J. Lozi; S. Vievard; V. Deo; M. Lallement; J. C. Bragg

doi:10.1117/12.2676667

5 October 2023 A non-linear curvature wavefront sensor for the Subaru telescope’s AO3k system

K. Ahn, O. Guyon, J. Lozi, S. Vievard, V. Deo, M. Lallement, J. C. Bragg

Author Affiliations +

Proceedings Volume 12680, Techniques and Instrumentation for Detection of Exoplanets XI; 126800B (2023) https://doi.org/10.1117/12.2676667
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

A few years ago, we started upgrading AO188 into AO3k, including the real-time control system, laser guide star system, Deformable Mirror (DM), and Wavefront Sensors (WFSs). In this paper, we present the development of a non-linear Curvature WFS (nlCWFS) as a new visible WFS for the upgraded AO3k system. We also introduce the optical and optomechanical design of the nlCWFS. The nlCWFS has two new features: one is the dual-stroke linear mode, and the other one is to deploy non-linear wavefront reconstruction. The dual-stroke linear mode provides a good sensitivity for both low- and high-order aberrations. Also, the non-linear wavefront reconstruction provides a large dynamic range. By combining the linear and non-linear methods, the nlCWFS takes both advantages. Finally, we present laboratory demonstration results of closed-loop experiments in the lab with linear and non-linear wavefront reconstruction algorithms.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

K. Ahn, O. Guyon, J. Lozi, S. Vievard, V. Deo, M. Lallement, and J. C. Bragg "A non-linear curvature wavefront sensor for the Subaru telescope’s AO3k system", Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 126800B (5 October 2023); https://doi.org/10.1117/12.2676667

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