Abstract
Adaptive optics can vastly improve the imaging of ground-based telescopes to nearly the diffraction limit Rayleigh guide stars at a range of about 15 km have been used to generate beacons for adaptive optics. However due to focus anisoplanatism modem telescopes with diamenters greater than about 1 meter must use guide stars at greater range. Lasers capable of generating sodium guide stars at about 95-km altitude are just now becoming available for use in closed-loop adaptive-optics systems.1
© 1996 Optical Society of America
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