Visible and infrared wavefront sensing for astronomical adaptive optics

Details Visible and infrared wavefront sensing for astronomical adaptive optics Visible and infrared wavefront sensing for astronomical adaptive optics

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259l..57r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 2, p. L57-L60.

Physics

Optics

6

Adaptive Optics, Infrared Astronomy, Infrared Detectors, Seeing (Astronomy), Wave Fronts, Charge Coupled Devices, Electron Bombardment, Quantum Efficiency

Scientific paper

The applicability of adaptive optics to astronomical standard observing critically depends on the ability to provide with sufficient sensitivity a reference measurement of the wavefronts distorted by the atmosphere. We describe successful operation of the VLT Adaptive Optics Prototype, called COMEON, with two reference channels: a visible one, quantum noise limited, and an infrared one. We define the adaptive optics limiting magnitudes (m sub)lim for closed-loop operation of a given system with a given turbulence and demonstrate on a 3.6-m telescope the lower limits (mR)sub lim = 13 and (mK)sub lim = 1.6. Optimization of the system transmission over the current prototype should soon lead to (mR)sub lim = 14 to 16 and (mK)sub lim is not less than 6.

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