Patent ID: 7907341

Claim:
A laser processing method of splitting processing laser light into a plurality of beams and thereafter projecting each of the plurality of beams through a condenser lens onto an object, said laser processing method comprising the steps of: locating said condenser lens relative to the object such that a beam-irradiated surface of the object is shifted by a predetermined distance along the optical axis of said condenser lens from a focus position of said condenser lens; generating ASE (Amplified Spontaneous Emission) light having a spectrum with a predetermined full width at half maximum, as the processing laser light; splitting the ASE light thus generated, into a plurality of beams, by using a DOE (Diffractive Optical Element); and projecting each of the plurality of split beams through said condenser lens onto the object, the plurality of beams thus split being homogenized as a whole and inputted into said condenser lens while being in parallel to each other.