-
Given the name and appearances, the first obvious thought is that perhaps lightsabers consist of some kind of Green 1mW Laser Pointer pen :http://www.buylaserpointer.com/10mw/p-181.html . However, this hypothesis is easy to rule out. Lasers don't have a fixed length, as you can determine using a simple laser pointer. Further, unless the light is somehow scattered, a laser is essentially invisible as it passes through the air. Neither of these characteristics describes a lightsaber.
