Laser Guide Star (LGS) Adaptive Optics (AO) on large telescopes has recently become a very
productive science tool for the astronomical community. Astronomical objects can now be observed
at an unprecedented resolution over much of the sky. The science enabled by LGS AO and the
capabilities and limitations of these systems will be discussed, along with the lessons learned that
can be applied to LGS AO systems on existing and planned telescopes.