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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
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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.
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(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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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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KEYWORDS
Wavefront sensors
Reconstruction algorithms
Spatial light modulators
Wavefront reconstruction
Adaptive optics
Telescopes
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