Conclusion

The paper has introduced the basic concepts and limitations of modern Astronomical AO systems. The most relevant parameters of such AO systems have been outlined. Using the expression identified for such quantities, the main limitation of Adaptive Optics, namely, the small sky coverage has been analyzed. The present day solution to such a problem, the use of laser guide star, has been described. Then, the diffraction limited instruments that will be operational on the LBT telescope have been introduced. This should provide the reader with an idea of what will be available in the next few years at the LBT telescope in terms of high angular resolution capabilities. Finally, we consider it very important for the astronomers of the next future to

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