LASER-FOCUSING HEAD WITH ZNS LENSES HAVING A PERIPHERAL THICKNESS OF AT LEAST 5 MM AND LASER CUTTING UNIT AND METHOD USING ONE SUCH FOCUSING HEAD

摘要

The invention relates to a particular optical configuration employed in a solid-state laser, in particular a fiber laser, cutting head for controlling the problems of focal drift and laser damage of the optics of the focusing head and to a laser unit equipped with such a focusing head, in particular an ytterbium-doped fiber laser unit.