Implementation of 188-element curvature-based wavefront sensor and calibration source unit for the subaru LGSAO system

Makoto Watanabe, Shin Oya, Yutaka Hayano, Hideki Takami, Masayuki Hattori, Yosuke Minowa, Yoshihiko Saito, Meguru Ito, Naoshi Murakami, Masanori Iye, Olivier Guyon, Stephen Colley, Michael Eldred, Taras Golota, Matthew Dinkins

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

14 Scopus citations


The Subaru laser guide star adaptive optics (AO) system was installed at the Nasmyth focus of the Subaru Telescope, and had the first light with natural guide star on October 2006. The AO system has a 188-element curvature based wavefront sensor with photon-counting avalanche photodiode (APD) modules. It measures highorder terms of wavefront using either of a single laser (LGS) or natural guide star (NGS) within a 2' diameter field. The AO system has also a source simulator. It simulates LGS and NGS beams, simultaneously, with and without atmospheric turbulence by two turbulent layer at about 0 and 6 km altitudes, and reproduces the cone effect for the LGS beam. We describe the design, construction, and integration of the curvature wavefront sensor and calibration source unit.

Original languageEnglish (US)
Title of host publicationAdaptive Optics Systems
StatePublished - 2008
EventAdaptive Optics Systems - Marseille, France
Duration: Jun 23 2008Jun 26 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherAdaptive Optics Systems


  • Adaptive optics
  • Curvature sensor
  • Laser guide star
  • Subaru telescope
  • 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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