3D ionizing laser can create and energy beam of a fixed length or point. And thus create your light saber. http://www.gizmag.com/burton-true-3d-laser-plasma-dis

3D ionizing laser can create and energy beam of a fixed length or point. And thus create your light saber. http://www.gizmag.com/burton-true-3d-laser-plasma-display/20499/ http://www.gizmag.com/burton-true-3d-laser-plasma-display/20...