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Proceedings Paper

Preliminary design and plans for the GTC adaptive optics system
Author(s): Nicholas Devaney; Dolores Bello; Bruno Femenia; Javier Castro; Alejandro Villegas Lopez; Marcos Reyes; Jesus J. Fuensalida
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Paper Abstract

The 10m Gran Telescopio Canarias (GTC) is currently being installed in the Observatorio del Roque de los Muchachos (ORM) on the island of La Palma. An adaptive optics (AO) system will be installed at one of the Nasmyth foci of the telescope within a year of the telescope being commissioned. The preliminary design of the adaptive optics system is presented here. The system will initially be operated in single-conjugate mode using a natural guide star, but provisions are made for upgrade to dual-conjugate operation and the use of laser guide stars. The main system requirements and the optical and mechanical design solutions are outlined here. It is planned to employ a piezo-stack deformable mirror having approximately 350 actuators and a Shack-Hartmann wavefront sensor. The tip-tilt correction will be provided by the secondary mirror of the GTC which is a lightweighted Beryllium mirror with a drive system capable of fast tip-tilt and chopping. In preparation for dual-conjugate operation we have studied the optimal altitude of the second deformable mirror (the first will be conjugate to the telescope pupil) using numerical simulations and measurements of turbulence obtained at the ORM. We have used the GSC II catalogue to determine sky-coverage for multi-natural guide star wavefront sensing, as required for dual-conjugate operation. In addition we have investigated a novel approach to multi-object wavefront sensing based on curvature sensing.

Paper Details

Date Published: 25 October 2004
PDF: 11 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.551638
Show Author Affiliations
Nicholas Devaney, Instituto de Astrofisica de Canarias (Spain)
Dolores Bello, Instituto de Astrofisica de Canarias (Spain)
Bruno Femenia, Instituto de Astrofisica de Canarias (Spain)
Javier Castro, Instituto de Astrofisica de Canarias (Spain)
Alejandro Villegas Lopez, Instituto de Astrofisica de Canarias (Spain)
Marcos Reyes, Instituto de Astrofisica de Canarias (Spain)
Jesus J. Fuensalida, Instituto de Astrofisica de Canarias (Spain)


Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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