Physics – Optics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1114..191g&link_type=abstract
IN: Active telescope systems; Proceedings of the Meeting, Orlando, FL, Mar. 28-31, 1989 (A90-30852 12-74). Bellingham, WA, Socie
Physics
Optics
1
Adaptive Optics, Atmospheric Correction, Laser Guidance, Seeing (Astronomy), Telescopes, Atmospheric Turbulence, Resonance Scattering, Systems Engineering, Visual Observation
Scientific paper
Artificial 'guide stars' for controlling an adaptive imaging system can be created in the upper atmosphere by using a laser to excite either Rayleigh backscattering or the mesospheric sodium layer. Attention is presently given to the design requirements of an adaptive-optics telescope employing Na-laser guide stars whose brightness will be a function of such factors as the Na abundance, the laser pulse energy and length, the laser bandwidth, the seeing angle, and the seeing cell diameter. It is concluded on the basis of both detailed theoretical calculations and experiments conducted at Mauna Kea Observatory that it should be possible to obtain, using a laser power of less than 30 W, near-diffraction-limited images for zenith angles down to 30 deg from ground-based telescopes as large as 10 m in aperture.
Gardner Chester S.
Thompson Laird A.
Welsh Byron M.
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