Patent ID: 8093530
Filing Date: 2012-01-10
Classification: B23K

Abstract:
1. A laser processing apparatus configured to concentrate laser light to a light concentrating point at a predetermined depth in a material from a surface of the material to form an internal processing region, comprising: a stage on which the material is disposed; a laser light source; and a loop optical system including a beam splitter; an afocal optical system provided in an optical path of the loop optical system and having an optical element whose relative position to the optical path is variable; wherein a laser beam emitted from the laser light source is split by the beam splitter; out of the split laser beams, one laser beam is radiated to the material and the other laser beam is guided to the loop optical system and then, further split by the beam splitter; and out of the further split laser beams, one laser beam is radiated to the material and the other laser beam is guided to the loop optical system again.