@inproceedings{65f57c8caeff4e5baa0390a8dbb6c792,
title = "A non-linear curvature wavefront sensor for the Subaru Telescope{\textquoteright}s AO3k system",
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.",
keywords = "Adaptive optics, phase diversity, wavefront reconstruction, wavefront sensing",
author = "K. Ahn and O. Guyon and J. Lozi and S. Vievard and V. Deo and M. Lallement and Bragg, {J. C.}",
note = "Publisher Copyright: {\textcopyright} 2023 SPIE.; Techniques and Instrumentation for Detection of Exoplanets XI 2023 ; Conference date: 21-08-2023 Through 24-08-2023",
year = "2023",
doi = "10.1117/12.2676667",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Ruane, {Garreth J.}",
booktitle = "Techniques and Instrumentation for Detection of Exoplanets XI",
}