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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationTechniques and Instrumentation for Detection of Exoplanets XI
EditorsGarreth J. Ruane
PublisherSPIE
ISBN (Electronic)9781510665743
DOIs
StatePublished - 2023
EventTechniques and Instrumentation for Detection of Exoplanets XI 2023 - San Diego, United States
Duration: Aug 21 2023Aug 24 2023

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume12680

Conference

ConferenceTechniques and Instrumentation for Detection of Exoplanets XI 2023
Country/TerritoryUnited States
CitySan Diego
Period8/21/238/24/23

Keywords

  • Adaptive optics
  • phase diversity
  • wavefront reconstruction
  • wavefront sensing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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