Laser processing head for processing work piece with high power laser beam substantially prevents power dependent focal position displacement, allows delivery of process gas

摘要

The laser processing head has focusing optics (8) for focusing a laser beam (4) arranged in a pressure chamber (10) carrying a process gas (G). The chamber has a diamond inlet window (20) for the laser beam. An imaging optical arrangement (22) outside the chamber is arranged so that an image of the laser beam is formed on the focusing optics by forming an intermediate focus (F).