There is disclosed a laser marking apparatus that is able to form dome-shaped marks on a finished glass disk that are visible to naked eyes. The laser marking apparatus comprises a CO2 laser beam generator, a pulse calibration, a beam modifying and energy stabilizing system, an attenuator, a galvanometer,...http://www.google.com/patents/US20050018738?utm_source=gb-gplus-sharePatent US20050018738 - Method and apparatus for laser marking on finished glass disk media
