Lightsabers have been around for millennia in the star wars galaxy. Jedi and Sith use them. The lightsaber is hand crafted. Although, some stormtroopers carried lightsabers, those were manufactured. The lightsaber works simpler than you might think. The main power source is a crystal that produces the blade. Next, there are several focusing lenses that focuses and amplifies the blade. Finally there is a focusing chamber that straightens the blade.