  A method for producing a laser guide star wavefront sensor for adaptive
optics with reduced focal anisoplanatism is presented. A theoretical analysis
and numerical simulations have been carried out and the results are presented.
The technique, named SPLASH (Sky-Projected Laser Array Shack-Hartmann), is
shown to suffer considerably less from focal anisoplanatism than a conventional
laser guide star system. The method is potentially suitable for large telescope
apertures (~8m), and possibly for extremely large telescopes.
