[quote=@rush99999]
...So there are no lightsabers then?
[/quote]

Oh no, Lightsabers can be used, kind of sorta.
Not in the star wars way, so no, it is not powered by a crystal. 
If you do use it, it would have to be used a sort of modified laser gun, as in you modify the gun/hilt to send out a constant stream of lasers firing that go to a certain length, the longer you make the lightsaber, the weaker it is.