Patent ID: 8652122

Claim:
A laser apparatus for material treatment, comprising: a source of laser radiation providing pulsed laser radiation comprising a train of laser pulses defining a laser-source pulse frequency, each pulse being adapted to separate layers in the material to achieve a treatment effect; and a deflecting device configured to operate at a speed of deflection, which directs said laser radiation into the material at different, selectable locations to separate layers at the selected locations within the material; a pulse picking device that basses both selected laser pulses of the train of laser pulses and remaining non-selected laser pulses of the train of laser pulses and modifies the selected laser pulses of the train of laser pulses with regard to at least one optical parameter of the selected laser pulses, such that the selected laser pulses cannot separate layers in the material and the non-selected laser pulses can separate layers in the material; and a control device operably coupled to the source of laser radiation, the deflecting device and the pulse picking device, wherein the control device controls operation of the source of laser radiation, the deflecting device and the pulse picking device to control the laser pulses which separate the layers at the selected locations in the material; wherein the laser-source pulse frequency remains constant independent of the speed of deflection and a frequency of the non-selected laser pulses.