Physics – Optics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21813214m&link_type=abstract
American Astronomical Society, AAS Meeting #218, #132.14; Bulletin of the American Astronomical Society, Vol. 43, 2011
Physics
Optics
Scientific paper
The adaptive optics system for the Giant Magellan Telescope will operate in three basic modes; natural guide star, laser tomography, and ground layer. The central component of the adaptive optics system, common to all modes, is a seven-segment adaptive secondary mirror. The natural guide star mode will enable high-contrast diffraction-limited imaging in the near-infrared in the vicinity of bright guide stars. Wavefront sensing will be done with a pyramid sensor. In the laser tomography mode, 6 laser guidestars measured with Shack-Hartmann wavefront sensors will be used to overcome focal anisoplanatism to achieve diffraction-limited imaging and spectroscopy in the infrared over 80% of the visible sky. A separate phase sensing system using faint natural guide stars is required to maintain equal pathlengths between the seven telescope apertures. In the final mode, the ground-layer adaptive optics system will use a wider constellation of laser guide stars to measure and correct the turbulence within a few hundred meters of the ground. This is expected to produce <0.3" FWHM images in the infrared over 10 arcmin fields of view under typical conditions.
Bouchez Antonin
Conan Rodolphe
Espeland B.
Hart Matthew
Hinz Phil
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