1. A dual mode seeker for intercepting a reentry vehicle, and configured with an onboard ladar system coordinated with an onboard IR system, the seeker comprising: a telescope having two or more mirrors forming a folded optical path that is adapted to receive IR and laser return information collected at a common aperture; a dichroic filter placed in the folded optical path, and adapted for separating the IR return information from the laser return information; an IR detector adapted to detect the IR return information separated by the dichroic filter, wherein the IR return information is received from a field of view associated with the IR system; and a laser detector adapted to detect the laser return information separated by the dichroic filter, the laser return information relevant to one or more objects included in the field of view.