They used a lightscribe dvd burner. I am not sure if the laser is much different, but it scribes the "back" side of a dvd. http://cleantechnica.com/2012/03/17

They used a lightscribe dvd burner. I am not sure if the laser is much different, but it scribes the "back" side of a dvd. http://cleantechnica.com/2012/03/17/make-your-own-supercapacitor-with-an-ordinary-dvd/ http://cleantechnica.com/2012/03/17/make-your-own-supercapac...