A controller outputs a first event signal having a periodical waveform and a second event signal having a periodical waveform synchronizing with the first event signal. A first laser source radiates a first pulse laser beam having a wavelength in an ultraviolet range, synchronously with the first event...http://www.google.es/patents/US6580055?utm_source=gb-gplus-sharePatente US6580055 - Laser processing apparatus and method
