Archaic Lightsaber
this was the name used by Jedi scholars and historians to denote the first lightsabers ever developed. Unlike the elegant weapons of the Jedi Knights used during the last decades of the Old Republic, the archaic lightsaber was designed as a siege weapon. Using "frozen blaster" technology, these lightsabers required a separate power pack which was often worn on the back. Over the millennia, the Jedi Knights were able to miniaturized most of the components used in the construction of a lightsaber, most notably power sources, to create the simple weapon known to most beings of the modern era.