LASER OPTICAL DEVICE AND LASER BEAM MACHINING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a laser optical device which brings light intensity distribution within the beam cross section of a laser beam closer to be uniform, using a simple structure. SOLUTION: A laser beam source emits a laser beam. At least two partial lenses are arranged inside the route of the laser beam emitted from the laser beam source. For the two partial lenses, one lens is divided on a plane parallel to the optical axis. A holding mechanism and the partial lenses are held movably, along a virtual plane vertical in the advancing direction of the laser beam.