Patent ID: 7473866

Claim:
A laser processing apparatus comprising a chuck table for holding a workpiece, laser beam irradiation means for irradiating the workpiece held on the chuck table with a laser beam, processing feed means for processing-feeding the chuck table and the laser beam irradiation means relative to each other, and indexing feed means for indexing-feeding the chuck table and the laser beam irradiation means in a direction perpendicular to a direction of the processing feeding, wherein the laser beam irradiation means includes first laser beam irradiation means for throwing a first pulsed laser beam having a wavelength in an intermediate-infrared radiation region, and second laser beam irradiation means for throwing a second pulsed laser beam having a wavelength in an ultraviolet radiation region, and the first laser beam irradiation means and the second laser beam irradiation means are set such that at least a part, in the direction of the processing feeding, of a focus spot of the second pulsed laser beam overlaps a focus spot of the first pulsed laser beam.