Abstract: Multiple guide stars are studied as a mean so of improving the performance of laser guide star (LGS) adaptive optical (AO) systems by reducing the effects of anisoplanatism. Previous work has shown that combining one sodium LGS and one Rayleigh LGS reduces tilt anisoplanatism for some turbulence profiles. In this paper, we investigate two scenarios of multiple guide star configurations. In the first scenario, AO correction based on three or more sodium beacons is studied. The second scenario investigates the use of a single sodium beacon in conjunction with a single Rayleigh beacon. For each of these case, two turbulence profiles, two deformable mirror conjugate altitudes, numerous tip-tilt guide star offsets, and two WFS subaperture array sizes are investigated. The best results of the two scenarios are determined and compared in terms of Strehl Ratio and residual tilt. !10
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