Laser guide star absolute tilt recovery using a single auxiliary telescope

It is shown that, using a pulsed laser to generate a laser guide star (LGS) , a frame transfer technique at the focal plane of an auxiliary telescope c an be used to retrieve the bidimensional tilt of such an LGS. We discuss ho w this approach can be used to reduce from two to one the number of auxilia ry telescopes in the NGS-based perspective technique proposed in the litera ture. A discussion of the requirements for the laser pulse format is given.