Patent ID: 7919726

Claim:
A laser irradiation apparatus comprising: a first laser oscillator generating a first pulsed laser beam having a wavelength of visible light or a shorter wavelength than that of visible light; means for controlling a shape and a position of a beam spot of the first laser beam; a plurality of second laser oscillators each generating a second continuous wave laser beam of a solid laser, the second continuous wave laser beam has a fundamental wave; a plurality of means for controlling a shape and a position of a beam spot of the respective second laser beam to overlap with the beam spot of the first laser beam, each of the plurality of means functioning such that a portion of the beam spot of the first laser beam and an entire portion of the respective beam spots of the second laser beams are overlapped with each other; and means for controlling a relative position of the beam spot of the first laser beam and the beam spot of the second laser beam to the processing object.