The Large Binocular Telescope is adding a constellation of laser guide stars to supplement the first-light natural guide star adaptive optics (AO) system. In Phase I, we rely on Rayleigh beacons to implement ground-layer AO over a 4 arcminute field. An upgrade in Phase II will see the addition of sodium lasers to provide diffraction-limited operation with wide sky coverage.

© 2009 Optical Society of America

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