Share Email Print
cover

Proceedings Paper

Progress on Altair: the Gemini North adaptive optics system
Author(s): Glen Herriot; Simon Morris; Andre Anthony; Dennis Derdall; Dave Duncan; Jennifer Dunn; Angelic W. Ebbers; J. Murray Fletcher; Tim Hardy; Brian Leckie; A. Mirza; Christopher L. Morbey; M. Pfleger; Scott C. Roberts; Philip Shott; M. Smith; Leslie K. Saddlemyer; Jerry Sebesta; Kei Szeto; Robert Wooff; W. Windels; Jean-Pierre Veran
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

The Gemini Adaptive Optics System, (Altair), under construction at the National Research Council of Canada's Herzberg Institute of Astrophysics is unique among AO systems. Altair is designed with its deformable mirror (DM) conjugate to high altitude. We summarize construction progress. We then describe Altair in more detail. Both the Wavefront sensor foreoptics and control system are unconventional, because the guide star footprint on an altitude-conjugated DM moves as the guide star position varies. During a typical nodding sequence, where the telescope moves 10 arcseconds between exposures, this footprint moves by half an actuator and/or WFS lenslet. The advantages of altitude conjugation include increased isoplanatic patch size, which improves sky coverage, and improved uniformity of the corrected field. Altitude conjugation also reduces focal anisoplanatism with laser beacons. Although the initial installation of Altair will use natural guide stars, it will be fully ready to use a laser guide star (LGS). The infrastructure of Gemini observatory provides a variety of wavefront sensors and nested control loops that together permit some unique design concepts for Altair.

Paper Details

Date Published: 7 July 2000
PDF: 11 pages
Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); doi: 10.1117/12.390288
Show Author Affiliations
Glen Herriot, Herzberg Institute of Astrophysics/National Research Council Canada (Canada)
Simon Morris, Herzberg Institute of Astrophysics/National Research Council Canada (Canada)
Andre Anthony, Herzberg Institute of Astrophysics/National Research Council Canada (Canada)
Dennis Derdall, Herzberg Institute of Astrophysics/National Research Council Canada (Canada)
Dave Duncan, Herzberg Institute of Astrophysics/National Research Council Canada (Canada)
Jennifer Dunn, Herzberg Institute of Astrophysics/National Research Council Canada (Canada)
Angelic W. Ebbers, Herzberg Institute of Astrophysics/National Research Council Canada (Canada)
J. Murray Fletcher, Herzberg Institute of Astrophysics/National Research Council Canada (Canada)
Tim Hardy, Herzberg Institute of Astrophysics/National Research Council Canada (Canada)
Brian Leckie, Herzberg Institute of Astrophysics/National Research Council Canada (Canada)
A. Mirza, National Research Council Canada (Canada)
Christopher L. Morbey, National Research Council Canada (Canada)
M. Pfleger, National Research Council Canada (Canada)
Scott C. Roberts, National Research Council Canada (Canada)
Philip Shott, National Research Council Canada (Canada)
M. Smith, National Research Council Canada (Canada)
Leslie K. Saddlemyer, National Research Council Canada (Canada)
Jerry Sebesta, National Research Council Canada (Canada)
Kei Szeto, National Research Council Canada (Canada)
Robert Wooff, National Research Council Canada (Canada)
W. Windels, National Research Council Canada (Canada)
Jean-Pierre Veran, National Research Council Canada (Canada)


Published in SPIE Proceedings Vol. 4007:
Adaptive Optical Systems Technology
Peter L. Wizinowich, Editor(s)

© SPIE. Terms of Use
Back to Top