FIXING THE LGS TILT PROBLEM USING TOMOGRAPHY

We propose a simple scheme to solve the tilt indetermination problem i n adaptive optics compensation with laser guide stars. This technique, providing tomographic turbulence analysis works, increases the area i nto which a tip-tilt guide star has to be found by approximately two o rders of magnitude, boosting the sky coverage close to 100% at visible wavelengths. In addition, the proposed scheme provides a tilt measure ment free of anisoplanatism error. It has numerous engineering advanta ges compared to other tilt retrieval techniques, as it does not requir e special auxiliary equipment nor an increased laser power.