Beam shaper and use thereof, laser beam treatment apparatus for work piece and use thereof, laser beam treatment method for work piece

摘要

A beam shaper (1) for shaping a laser beam, a first beam shaping unit (2) designed to shape the central portion of the laser beam, and a peripheral portion of the laser beam. A second beam shaping section (3) is provided. Further, a laser beam treatment apparatus for a workpiece and a laser beam treatment method for a workpiece are provided.